Bearing data

Main dimensions

The main dimensions are the key dimensions of a rolling bearing. They include ➤ Figure:

• the bore diameter (d)
• the outside diameter (D)
• the width or height (B, C, T or H)
• the chamfer dimensions (r)

Main dimensions Deep groove ball bearing (radial bearing) Axial deep groove ball bearing (axial bearing)

Standardised and non-standardised dimensions

External dimensions are standardised

The dimensions which determine the installation space are standardised. Standardisation is not, however, applied to the internal dimensions, such as the size and quantity of the rolling elements for example. The main dimensions of metric rolling bearings are defined in the following ISO dimension plans:

• ISO 15:2017 for radial rolling bearings, excluding single row needle roller bearings, insert bearings and tapered roller bearings
• ISO 355 : 2007 for tapered roller bearings
• ISO 104 : 2015 for axial bearings

DIN 616 describes dimension plans for radial and axial bearings. An overview of ISO and DIN rolling bearing standards is given in DIN 611:2010-05.

ISO dimension plans

Standard dimensions

Experience has shown that the predominant proportion of all bearing arrangement tasks can be fulfilled using bearings with standard dimensions, which are contained in ISO dimension plans.

Advantages of dimension plans

The dimension plans are valid for different bearing types. Standard rolling bearings of different types can thus be manufactured to the same external dimensions. As a result, a designer working on the same design envelope can make a selection between bearings of several types with the same external dimensions.

Several outside diameters/ width dimensions are assigned to one bearing bore

In the dimension plans, one bearing bore is allocated several outside diameters and width dimensions. In this way, it is possible to design several bearings of the same type that, for the same bore, exhibit different load carrying capacities. The development of new bearing series and individual new rolling bearings in accordance with the dimension plans has considerable advantages for users and manufacturers.

Width and diameter series

Bearing series are described using numbers

Width and diameter series are described using numbers. In the case of radial bearings in accordance with DIN 616 and ISO 15, these are as follows:

• for width series, the numbers 8, 9, 0, 1, 2, 3, 4, 5, 6, 7 ➤ Figure
• for the identification of diameter series, the numbers 7, 8, 9, 0, 1, 2, 3, 4, 5 ➤ Figure

Identification of width series For radial bearings to DIN 616 and ISO 15 Width series

Identification of diameter series For radial bearings to DIN 616 and ISO 15 Diameter series

Dimension series

The dimension series is created from the width series and the diameter series

The specific number of the width and diameter series, when combined, identifies the dimension series ➤ Table. When this table is used, for example, for a radial bearing of the width series 2 and the diameter series 3, this gives the dimension series 23 ➤ Table and ➤ Figure. If the bearing bore code is then added, ➤ section, the bearing size is completely defined.

Dimension series for radial bearings (excluding tapered roller and needle roller bearings)

Width series – increase in cross-sectional width
		8	9	0	1	2	3	4	5	6	7
Diameter series – increase in cross-sectional height	5	‒	‒	‒	‒	‒	‒	‒	‒	‒	‒
	4	‒	‒	04	‒	24	‒	‒	‒	‒	‒
	3	83	‒	03	12	23	33	‒	‒	‒	‒
	2	82	‒	02	12	22	32	42	52	62	‒
	1	‒	‒	01	11	21	31	41	51	61	‒
	0	‒	‒	00	10	20	30	40	50	60	‒
	9	‒	‒	09	19	29	39	49	59	69	‒
	8	‒	‒	08	18	28	38	48	58	68	‒
	7	‒	‒	‒	17	27	37	47	‒	‒	‒

 

Generation of the dimension series Width series Diameter series Dimension series

Dimension plan for metric tapered roller bearings to ISO 355

Tapered roller bearings can generally also be classified in the dimension plans to ISO 355 ➤ Figure. The dimension series are designated in these by a combination of three symbols, e. g. 3FE ➤ Figure.

Dimension plan for tapered roller bearings (excerpt) to ISO 355 Contact angle series (range of contact angles) Diameter series Width series

Designation system

Clear designation

Each rolling bearing has a designation that clearly indicates the type, dimensions, tolerances and internal clearance, if necessary with other important features.

Interchangeability

Bearings that have the same standardised designation are interchangeable with each other. In the case of separable bearings, it cannot always be ensured that individual parts with the same origin can be interchanged with each other.

In Germany, the bearing designations are standardised in DIN 623-1. These designations are also used in many other countries.

Designation

The designation is a code comprising numbers and letters

The designation for the bearing series comprises numbers and letters or letters and numbers. It indicates the type of bearing, the diameter series and, in many cases, the width series too ➤ Figure, ➤ Figure and ➤ Figure. The diameter and width series are described in ➤ section.

Basic designation, prefix and suffix

Basic designation

The basic designation contains the symbols for the bearing series and the bearing bore ➤ Figure, ➤ Figure and ➤ Figure.

Prefix

The prefix normally identifies individual bearing parts of complete bearings (in certain cases, this may also be part of the basic designation) ➤ Figure and ➤ Figure.

Suffix

The suffix defines special designs and features ➤ Figure and ➤ Figure. The prefix and suffix describe other features of the bearing but are not standardised in all cases and may vary in use depending on the manufacturer.

Designations – examples

Examples of the composition of designations on the basis of their definition in accordance with ➤ Figure are shown on ➤ Figure.

Composition of designations

Examples of bearing designations, constructed in accordance with ➤ Figure Spherical roller bearing Deep groove ball bearing Axial cylindrical roller bearing

Designations of metric tapered roller bearings according to ISO 355 and ISO 10317

Structure of bearing designation for metric tapered roller bearings

➤ Figure describes as an example the structure of the designation for a metric tapered roller bearing (dimension series to ISO 355, designation to ISO 10317). The 3 indicates the contact angle range. The first letter (F in this case) indicates a diameter series. Each diameter series has a certain ratio D/d (outside diameter to bore diameter). The second letter (E in this case) indicates a width series. Each width series has a certain ratio of bearing width T to the height of the bearing cross-section. The addition of the letter T (for tapered roller bearing) at the start and a three-digit number at the end for the bearing bore diameter in mm (in this case 120) gives the complete designation of a tapered roller bearing (e. g. T3FE 120 ➤ Figure).

DIN 720 Appendix 1 gives an interchange table for DIN and ISO designations.

Composition of designation for metric tapered roller bearings to ISO 10317 Dimension series to ISO 355, designation to ISO 10317

Example designation for metric tapered roller bearings to DIN 720

Bearing designations in accordance with DIN 623-1:1993 – basic designation structure

Determining the bearing bore

For d ＜ 10 mm, the bore diameter is stated in the basic designation

For certain bearing types, the bearing bores are stated directly or in an encoded form in accordance with DIN 623-1. Up to d ＜ 10 mm, the bearing bore diameter is specified in the dimension-specific part of the designation (basic designation) directly as a number indicating the diameter ➤ Figure.

Example

Deep groove ball bearing 623, bore diameter = 3 mm.

Bore code

The bore code describes the bearing bore from d ≧ 10 mm

For nominal dimensions d ≧ 10 mm to d ＜ 500 mm, the diameter is described by means of a bore code ➤ Figure.

For bores from 10 mm to 17 mm, the following applies:

• d = 10 mm, bore code 00
• d = 12 mm, bore code 01
• d = 15 mm, bore code 02
• d= 17 mm, bore code 03

For all rolling bearings in the range from d = 20 mm to d = 480 mm (excluding double direction axial bearings), the bore code is formed by dividing the dimension of the bearing bore by 5.

Example

Bearing bore d = 360 mm divided by 5 (360 : 5), bore code = 72.

From d ＞ 480 mm

From d ＞ 480 mm, the unencoded bore diameter is given with an oblique after the bearing series, e.g. 618/500 with bore diameter d = 500 mm.

Intermediate sizes

The intermediate sizes, such as bore diameter d = 22, 28 and d = 32 mm for example, are also given with an oblique as /22, /28 and /32.

Magneto bearings

In the case of magneto bearings, the unencoded nominal bore dimension is given.

Radial internal clearance

The radial internal clearance is determined on the dismounted bearing

The radial internal clearance applies to bearings with an inner ring and is determined on the unmounted bearing. It is defined as the amount by which the inner ring can be moved in a radial direction from one extreme position to the other in relation to the outer ring ➤ Figure.

The radial internal clearance groups are defined in DIN 620-4 and ISO 5753-1 and are described in DIN 620-4 by means of codes that comprise the capital letter C and a number. ISO 5753-1 designates the groups by the word "Group" and a number ➤ Figure and ➤ Table.

Internal clearance groups C2, CN, C3, C4, C5 = radial internal clearance groups according to DIN 620-4 Group 2, N, 3, 4, 5 = radial internal clearance groups according to ISO 5753-1

Radial internal clearance groups

Internal clearance group		Description	Application
DIN 620-4	ISO 5753-1
C2	Group 2	Internal clearance ＜ CN	For heavy alternating loads combined with swivel motion
CN	Group N	Normal internal clearance, CN is not included in bearing designations	For normal operating conditions with shaft and housing tolerances
C3	Group 3	Internal clearance ＞ CN	For bearing rings with press fits and large temperature differential between the inner and outer ring
C4	Group 4	Internal clearance ＞ C3	For bearing rings with press fits and large temperature differential between the inner and outer ring
C5	Group 5	Internal clearance ＞ C4	For bearing rings with press fits and large temperature differential between the inner and outer ring

Enveloping circle

For bearings without an inner ring, the enveloping circle F_w is used. This is the inner inscribed circle of the rolling elements in clearance-free contact with the outer raceway ➤ Figure.

Enveloping circle Fw = enveloping circle diameter Rolling element Outer raceway

Operating clearance

The operating clearance is determined on a bearing still warm from operation

The operating clearance is determined on a mounted bearing still warm from operation. It is defined as the amount by which the shaft can be moved in a radial direction from one extreme position to the other.

The operating clearance is derived from the radial internal clearance and the change in the radial internal clearance as a result of interference fit and thermal influences in the mounted condition.

A normal operating clearance is usually achieved with internal bearing clearance CN

The operating clearance value is dependent on the operating and installation conditions of the bearing. A larger operating clearance is, for example, necessary if heat is transferred via the shaft, the shaft undergoes deflection or if misalignment occurs. An operating clearance smaller than CN should only be used in special cases, for example in high precision bearing arrangements. Normal operating clearance is achieved with an internal clearance of CN or, for larger bearings, more usually C3 if the recommended shaft and housing tolerances are maintained.

Calculation of operating clearance

The operating clearance is determined in accordance with ➤ Equation.

Operating clearance

Legend

s	μm	Radial operating clearance of mounted bearing warm from operation
sr	μm	Radial internal clearance
ΔsP	μm	Reduction in radial internal clearance due to fit
ΔsT	μm	Reduction in radial internal clearance due to temperature

Reduction in radial internal clearance due to fit

The radial internal clearance is reduced due to the fit as a result of expansion of the inner ring and contraction of the outer ring ➤ Equation.

Reduction in radial internal clearance

Legend

ΔsP	μm	Reduction in radial internal clearance due to fit
Δd	μm	Expansion of the inner ring
ΔD	μm	Contraction of the outer ring

The expansion of the inner ring is calculated in accordance with ➤ Equation.

Expansion of the inner ring

Legend

d	mm	Bore diameter of the inner ring
U	μm	Theoretical interference of the fitted parts with firm seating. The theoretical oversize of the fitted parts with a firm seating is determined from the mean deviations and the upper and lower deviations of the tolerance zones of the fitted parts reduced by 1/3 of their acceptable value. The amount of surface smoothing during assembly must be subtracted from this.
F	mm	Raceway diameter of the inner ring

For very thin-walled housings and light metal housings, the reduction in the radial internal clearance must be determined by mounting trials.

The contraction of the outer ring is calculated in accordance with ➤ Equation.

Contraction of the outer ring

Legend

ΔD	μm	Contraction of the outer ring
E	mm	Raceway diameter of the outer ring
D	mm	Outside diameter of the outer ring

Reduction in radial internal clearance due to temperature

The radial internal clearance can alter considerably if there is a substantial temperature differential between the inner and outer ring ➤ Equation.

Reduction in radial internal clearance due to temperature

Legend

ΔsT	μm	Reduction in radial internal clearance due to temperature
α	K-1	Coefficient of thermal expansion of steel: α = 0,000011 K-1
dM	mm	Mean bearing diameter (d + D)/2
ϑIR	°C, K	Temperature of the inner ring
ϑAR	°C, K	Temperature of the outer ring (usual temperature difference between inner and outer ring: 5 K to 10 K)

A larger radial internal clearance should be used for shafts running at high speeds, since adequate thermal compensation between the bearing, shaft and housing does not occur in this situation. Δs_T can, in this case, be significantly higher in this case than for continuous operation.

Axial internal clearance

The axial internal clearance s_a is defined as the amount by which one bearing ring can be moved relative to the other, without load, along the bearing axis ➤ Figure.

Axial internal clearance in comparison with radial internal clearance sa = axial internal clearance sr = radial internal clearance

Relationship between radial and axial internal clearance

With various bearing types, the radial internal clearance s_r and the axial internal clearance s_a are dependent on each other. Guide values for the correlation between radial and axial internal clearance are shown for some bearing types ➤ Table.

Correlation between axial internal clearance and radial internal clearance

Bearing type		Ratio between axial and radial internal clearance sa/sr
Self-aligning ball bearings		2,3 · Y01)
Spherical roller bearings		2,3 · Y01)
Tapered roller bearings	Single row, arranged in pairs	4,6 · Y01)
Tapered roller bearings	Matched pairs (DF)	2,3 · Y01)
Angular contact ball bearings	Double row, series 32 and 33	1,4
Angular contact ball bearings	Double row, series 32..-B and 33..-B	2
Four point contact bearings		1,4

1. Y₀ = axial load factor in accordance with product table.

If the operating clearance is an important design criterion, please consult Schaeffler.

The calculation module BEARINX Shaft Calculation, which is available from Schaeffler free of charge, can be used to calculate and analyse the operating clearance.

Calculation example

Example: deep groove ball bearing 6008-C3

For deep groove ball bearings, the calculation of the axial internal clearance is shown in the following example:

Deep groove ball bearing		6008-C3
Bore diameter d		40 mm
Radial internal clearance before fitting		15 μm to 33 μm
Actual radial internal clearance		24 μm
Mounting tolerance	Shaft	k5
	Housing	j6
Reduction in radial internal clearance during fitting		14 μm
Radial internal clearance after fitting /		24 μm - 14 μm = 10 μm
Ratio sa / sr		13

Axial internal clearance

• s_a = 13 · 10 μm = 130 μm

Approximate calculation of the ratio of radial to axial internal clearance for deep groove ball bearings sa = axial internal clearance sr = radial internal clearance d = bearing bore diameter Bearing series

Bearing materials

Standard steels

Schaeffler rolling bearings fulfil the requirements for fatigue strength, wear resistance, hardness, toughness and structural stability. The material used for the rings and rolling elements is generally a low-alloy, through hardening chromium steel of high purity. For bearings subjected to considerable shock loads and reversed bending stresses, case hardening steel is also used (supplied by agreement). The results of research as well as practical experience confirm that bearings made from the steel currently used as standard can achieve their endurance limit if loads are not excessively high and the lubrication and cleanliness conditions are favourable.

High Nitrogen Steel

For the most challenging conditions

Through the use of special bearings made from HNS (High Nitrogen Steel, supplied by agreement), it is possible to achieve adequate service life even under the most challenging conditions (high temperatures, moisture, contamination).

High performance steels Cronidur and Cronitect

Steels for increased requirements

For increased performance requirements, highly corrosion-resistant, nitrogen-alloyed martensitic HNS steels are available, such as Cronidur and Cronitect.

In contrast to Cronidur, the more economical alternative Cronitect has nitrogen introduced into the structure by means of a surface layer hardening process.

Both steels are clearly superior to conventional corrosion-resistant steels for rolling bearings in terms of corrosion resistance and fatigue strength.

Ceramic materials

Hybrid bearings

Ceramic hybrid spindle bearings contain balls made from silicon nitride. These ceramic balls are substantially lighter than steel balls. The centrifugal forces and friction are significantly lower.

Hybrid bearings allow very high speeds, even with grease lubrication, as well as long operating life and low operating temperatures.

Materials and bearing components

Suitable materials and their use in rolling bearing technology ➤ Table.

Materials and bearing components

Material	Bearing components (example)
Through hardening chromium steel – rolling bearing steel in accordance with ISO 683-17	Outer and inner ring, axial washer
HNS – High Nitrogen Steel	Outer and inner ring
Corrosion-resistant steel – rolling bearing steel in accordance with ISO 683-17	Outer and inner ring
Case hardening steel	For example, outer ring of yoke type track rollers
Flame or induction hardening steel	Roller stud of stud type track rollers
Steel strip to EN 10139, SAE J403	Outer ring for drawn cup needle roller bearings
Silicon nitride	Ceramic balls
Brass alloy	Cage
Aluminium alloy	Cage
Polyamide (thermoplastic)	Cage
NBR, FKM, TPU	Sealing ring

Corrosion protection by Corrotect

Rolling bearings are not resistant to corrosion by water or agents con­taining alkalis or acids but are often exposed to these corrosion-inducing agents. In these applications, corrosion protection is therefore a decisive factor in achieving a long operating life of the bearings.

In principle, corrosion-resistant steels to ISO 683-17 can be used. These bearings have the prefix S. For higher requirements, it may be advisable to use the high performance steels Cronidur and Cronitect.

Corrotect coating

Special coatings

An extensive modular coating concept currently offers a wide range of surface improvements aimed at increasing the performance and rating life of bearing components. The “added value in the form of coatings” thus provided, is now established as a standard procedure for a wide variety of Schaeffler components.

Various coating variants and coating thicknesses

Thin anti-corrosion coating systems of 0,5 μm – 3 μm and 2 μm – 5 μm are available for bearing applications. Various Corrotect variants with coating thicknesses ＞ 5 μm also exist, which can be applied as necessary. The Corrotect coatings thus offer corrosion protection times – as a function of the coating variant and coating thickness – of ≧ 720 h against base metal corrosion (in accordance with DIN EN ISO 9227).

Cr(VI)-free coatings

Systems are free from Cr(VI), provide effective protection against corrosion and, as result, extend the useful life of Schaeffler components. In isolated cases, the dimensional changes brought about by the coating must be taken into account in a further processing operation.

Detailed information on the modular coating concept and individual coating systems can be found in Technical Product Information TPI 186 “Higher Performance Capacity Through the Use of Coatings”. This publication can be requested from Schaeffler.

Advantages of Corrotect thin coating

The advantages of the special coating Corrotect are all-round corrosion protection, including the turned surfaces of chamfers and radii ➤ Figure. It also gives long-term prevention of rust penetration beneath seals and smaller bright spots are protected against corrosion by the cathodic protection effect. In comparison with uncoated parts, operating life is significantly increased by the corrosion protection. There is no decrease in load carrying capacity (such as occurs in the use of corrosion-resistant steels). It is therefore theoretically possible to replace uncoated bearings by coated bearings of the same dimensions. However, it is advisable to check the suitability for the specific application in advance since, for example, abrasion may occur. During storage, there is no need to use organic preservatives.

Mounting of Corrotect-coated bearings

Before bearings with Corrotect coating are mounted, compatibility with the media should always be checked.

For lower press-in forces, the surface of the parts should be lightly greased, the tolerances are increased by the thickness of the coating.

Coated and uncoated part after a salt spray test Test time 24 h in salt spray With Corrotect coating Uncoated

Cages

The functions of cages

Cage is a retainer with pockets for the rolling elements

Cage pockets, which are separated from each other by bars and are uniformly distributed around the circumference of the cage, maintain the spacing of the rolling elements relative to each other and ensure the distribution of load. In addition, the bars prevent sliding friction between adjacent rolling elements and guide the rolling elements parallel to the bearing axis in the load-free zone. In the case of cylindrical and needle roller bearings, they additionally prevent skewing of the rolling elements by guiding the rolling elements parallel to the bearing axis.

Cages ensure spacing between the rolling elements, even in the load-free zone

In the load-free zone, the rolling elements are no longer driven by the inner or outer ring. As a result, they fall behind relative to the direction of rotation of the rings. Cages ensure that the spacing between the rolling elements is maintained, even in the load-free zone.

Where bearings are separable and can be swivelled, the rolling elements cannot escape from the bearing

In the case of bearings that are separable and can be swivelled, such as tapered roller, spherical roller and some cylindrical roller bearings, cages prevent rolling elements from falling out of the bearing. The rolling element set and cage can thus be mounted and dismounted as a complete unit.

Sheet metal or solid section cages

Sheet metal cages

Rolling bearing cages are subdivided into sheet metal and solid section cages. The cages are predominantly made from steel and, for some bearings, from brass ➤ Figure. In comparison with solid section cages made from metal, sheet metal cages are of lower mass. Since a sheet metal cage only fills a small proportion of the gap between the inner and outer ring, lubricant can easily reach the interior of the bearing and is held on the cage. In general, a sheet steel cage is only included in the bearing designation if it is not defined as a standard version of the bearing.

Solid cages

These cages are made from metal, laminated fabric or plastic ➤ Figure. They can be identified from the bearing designation.

Solid cages made from metal or laminated fabric

Solid cages made from metal are used where there are requirements for high cage strength and at high temperatures. Solid cages are also used if the cage must be guided on ribs. Rib-guided cages for bearings running at high speeds are made in many cases from light materials, such as light metal or laminated fabric, in order to achieve low inertia forces.

Solid cages made from polyamide PA66

Solid cages made from polyamide PA66 are produced using the injection moulding process ➤ Figure. As a result, cage types can generally be realised that allow designs with particularly high load carrying capacity. The elasticity and low mass of polyamide are favourable under shock type bearing loads, high accelerations and decelerations and tilting of the bearing rings in relation to each other. Polyamide cages have very good sliding and emergency running characteristics.

Cages made from glass fibre reinforced polyamide PA66 are suitable for continuous temperatures up to +120 °C. For higher operating temperatures, plastics such as PA46 or PEEK can be used.

When using oil lubrication, additives in the oil can impair the cage operating life. Aged oil can also impair the cage operating life at high temperatures, so attention must be paid to compliance with the oil change intervals.

Cage designs

Proven cage designs ➤ Figure to ➤ Figure.

Sheet steel cages Riveted cage for deep groove ball bearings Window cage for needle roller bearings Window cage for spherical roller bearings

Solid brass cages Riveted solid cage for deep groove ball bearings Window cage for angular contact ball bearings Riveted cage with crosspiece rivets for cylindrical roller bearings

Solid cages made from glass fibre reinforced polyamide Window cage for single row angular contact ball bearings Window cage for cylindrical roller bearings Window cage for needle roller bearings

Guidance of cages

The cages are guided by rolling elements or ribs

A further means of distinguishing between cages is their guidance method ➤ Figure. Most cages are guided by the rolling elements and do not have a suffix for the guidance method. If guidance is by the bearing outer ring, the suffix A is used. Cages that are guided on the inner ring have the suffix B.

Standard cages are suitable under normal operating conditions

Under normal operating conditions, the cage design defined as the standard cage is generally suitable. Standard cages, which may differ within a bearing series according to the bearing size, are described in the product chapters. Under special operating conditions, a cage that is suitable for the specific conditions must be selected.

Guidance of cages Guided by rolling elements Guided by ribs

Operating temperature

Standard rolling bearings can be used up to +120 °C

Rolling bearings are heat treated such that, depending on the bearing type, they are generally dimensionally stable up to +120 °C (certain bearings up to +150 °C). Operating temperatures above +150 °C require special heat treatment. Bearings treated in this way are available by agreement and are identified by the suffix S1, S2, S3 or S4 to DIN 623-1 ➤ Table.

Above S1, there is a reduction in hardness that must be taken into consideration in the rating life calculation.

Operating temperature and suffixes for dimensionally stabilised bearings

Maximum operating temperature	Suffix for dimensionally stabilised bearings
°C
+120	SN1) (suffix SN not stated)
+150	S01)
+150	S0B2) (suffix B not stated)
+200	S11)
+250	S21)
+300	S31)
+350	S41)

1. Inner ring and outer ring stabilised for stated operating temperature
2. Inner ring stabilised up to +150 °C

Track rollers

Normal operating temperature = +70 °C

An operating temperature of +70 °C is regarded as a normal operating temperature. Further temperature data in the product descriptions must be observed.

Sealed bearings

Temperature limits

The permissible temperature for sealed bearings is dependent on the requirements for the operating life of the grease filling and on the action of the contact seals. Sealed bearings are greased with specially tested, high performance, high quality greases. These greases can withstand +120 °C for short periods. At or above continuous temperatures of +70 °C, a reduction in the operating life of standard greases with a lithium soap base must be expected.

Special greases are often required for high temperatures

In many cases, adequate operating life values are only achieved at high temperatures through the use of special greases. In these cases, it must also be checked whether seals made from especially heat-resistant materials must be used. The operating limit of normal contact seals is +100 °C.

If high temperature synthetic materials are used for seals and greases, it must be noted that the particularly high performance materials containing fluoride may give off harmful gases and vapours when heated to approx. +300 °C and above. This may occur, for example, if a welding torch is used in the dismantling of a bearing.

Observe safety data sheets at high temperatures

High temperatures are critical especially in the case of seals made from fluoro rubber (FKM, FPM, e. g. Viton®) or greases containing fluoride, such as the rolling bearing greases Arcanol TEMP200 and greases to GA11. If high temperatures are unavoidable, attention must be paid to the valid safety data sheet for the specific fluoride-containing material, which can be obtained upon request.

Dimensional and running tolerances

International standards are usually valid for the main dimensions and running accuracy of rolling bearings. Unless specified otherwise, the tolerances for radial rolling bearings correspond to ISO 492:2014 and, for axial rolling bearings, to ISO 199:2014. Information on which bearings are supplied with which tolerances is provided in the relevant product chapters.

Main dimensions

Main dimensions of bearings ➤ Figure.

Main dimensions of bearings

Accuracy (tolerance classes)

Tolerance class Normal

The dimensional and running accuracy of rolling bearings corresponds to tolerance class Normal. For bearings with increased accuracy, the tolerances are restricted to values in the classes 6, 5, 4 and 2. Tolerance tables for the individual tolerance classes ➤ Table to ➤ Table.

Super precision bearings

In addition to the standardised tolerance classes, super precision bearings are also produced to the tolerance classes P4S, SP and UP. These tolerances are listed in the relevant product descriptions.

Tolerance symbols, toleranced characteristics, deviations for radial and axial rolling bearings

The following restrictions apply to the stated specification modifiers in ➤ Table and ➤ Table:

• The specification modifier is not indicated on a drawing if the two-point size is defined as the default specification
• The specification modifier is not suitable for cases where there is no material with mating contact, for example the outer ring of a tapered roller bearing with significant edge rounding on the back face and small front face. Solutions must be developed within the framework of the GPS system and taken into consideration in the future

Symbols for nominal dimensions, characteristics and specification modifiers for radial rolling bearings in accordance with ISO 492:2014

1. Symbols for the nominal dimension are printed in bold; they indicate size dimensions and spacings.
2. Symbols in accordance with ISO 1101 and ISO 14405-1.
3. Specification modifiers for the direction of action of the mass in accordance with ISO/TS 17863.
4. Valid only for axial ball bearings and axial cylindrical roller bearings with a 90° contact angle.

Symbols for nominal dimensions, characteristics and specification modifiers for axial rolling bearings in accordance with ISO 199:2014

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

Tolerance class Normal, inner ring width tolerances

Nominal bore diameter		Deviation of inner ring width			Variation of inner ring width
d		tΔBs			tVBs
		μm
mm		All	Normal	Modified1)	μm
over	incl.	U	L	L	max.
‒	2,5	0	–40	‒	12
2,5	10	0	–120	–250	15
10	18	0	–120	–250	20
18	30	0	–120	–250	20
30	50	0	–120	–250	20
50	80	0	–150	–380	25
80	120	0	–200	–380	25
120	180	0	–250	–500	30
180	250	0	–300	–500	30
250	315	0	–350	–500	35
315	400	0	–400	–630	40
400	500	0	–450	‒	50
500	630	0	–500	‒	60
630	800	0	–750	‒	70
800	1 000	0	–1 000	‒	80
1 000	1 250	0	–1 250	‒	100
1 250	1 600	0	–1 600	‒	120
1 600	2 000	0	–2 000	‒	140

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. Only for bearings manufactured specifically for use as matched pairs, with the exception of deep groove ball bearings.

Tolerance class Normal, outer ring¹⁾

Nominal size of outside diameter		Deviation of outside diameter		Variation					Radial runout
D		tΔDmp		tVDsp				tVDmp2)	tKea
				μm
				max.
				Open bearings			Bearings with sealing shields or sealing washers
mm		μm		Diameter series				μm	μm
over	incl.	U	L	9	0, 1	2, 3, 4		max.	max.
‒	6	0	–8	10	8	6	10	6	15
6	18	0	–8	10	8	6	10	6	15
18	30	0	–9	12	9	7	12	7	15
30	50	0	–11	14	11	8	16	8	20
50	80	0	–13	16	13	10	20	10	25
80	120	0	–15	19	19	11	26	11	35
120	150	0	–18	23	23	14	30	14	40
150	180	0	–25	31	31	19	38	19	45
180	250	0	–30	38	38	23	‒	23	50
250	315	0	–35	44	44	26	‒	26	60
315	400	0	–40	50	50	30	‒	30	70
400	500	0	–45	56	56	34	‒	34	80
500	630	0	–50	63	63	38	‒	38	100
630	800	0	–75	94	94	55	‒	55	120
800	1 000	0	–100	125	125	75	‒	75	140
1 000	1 250	0	–125	‒	‒	‒	‒	‒	160
1 250	1 600	0	–160	‒	‒	‒	‒	‒	190
1 600	2 000	0	–200	‒	‒	‒	‒	‒	220
2 000	2 500	0	–250	‒	‒	‒	‒	‒	250

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. t_ΔCs, t_ΔC1s, t_VCs and t_VC1s are identical to t_ΔBs and t_VBs for the inner ring of the corresponding bearing ➤ Table.
2. Applies before assembly of the bearing and after removal of internal and/or external snap rings.

Radial bearings, excluding tapered roller bearings

Tolerance class 6, inner ring

Nominal bore diameter		Bore deviation		Variation				Radial runout
d		tΔdmp		tVdsp			tVdmp	tKia
				μm
				max.
mm		μm		Diameter series			μm	μm
over	incl.	U	L	9	0, 1	2, 3, 4	max.	max.
‒	2,5	0	–7	9	7	5	5	5
2,5	10	0	–7	9	7	5	5	6
10	18	0	–7	9	7	5	5	7
18	30	0	–8	10	8	6	6	8
30	50	0	–10	13	10	8	8	10
50	80	0	–12	15	15	9	9	10
80	120	0	–15	19	19	11	11	13
120	180	0	–18	23	23	14	14	18
180	250	0	–22	28	28	17	17	20
250	315	0	–25	31	31	19	19	25
315	400	0	–30	38	38	23	23	30
400	500	0	–35	44	44	26	26	35
500	630	0	–40	50	50	30	30	40

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

Tolerance class 6, inner ring width tolerances

Nominal bore diameter		Deviation of inner ring width			Variation of inner ring width
d		tΔBs			tVBs
		μm
mm		All	Normal	Modified1)	μm
over	incl.	U	L	L	max.
‒	2,5	0	–40	‒	12
2,5	10	0	–120	–250	15
10	18	0	–120	–250	20
18	30	0	–120	–250	20
30	50	0	–120	–250	20
50	80	0	–150	–380	25
80	120	0	–200	–380	25
120	180	0	–250	–550	30
180	250	0	–300	–500	30
250	315	0	–350	–500	35
315	400	0	–400	–630	40
400	500	0	–450	‒	45
500	630	0	–500	‒	50

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. Only for bearings manufactured specifically for use as matched pairs, with the exception of deep groove ball bearings.

Tolerance class 6, outer ring¹⁾

Nominal size of outside diameter		Deviation of outside diameter		Variation					Radial runout
D		tΔDmp		tVDsp				tVDmp2)	tKea
				μm
				max.
				Open bearings			Bearings with sealing shields or sealing washers
mm		μm		Diameter series				μm	μm
over	incl.	U	L	9	0, 1	2, 3, 4		max.	max.
‒	6	0	–7	9	7	5	9	5	8
6	18	0	–7	9	7	5	9	5	8
18	30	0	–8	10	8	6	10	6	9
30	50	0	–9	11	9	7	13	7	10
50	80	0	–11	14	11	8	16	8	13
80	120	0	–13	16	16	10	20	10	18
120	150	0	–15	19	19	11	25	11	20
150	180	0	–18	23	23	14	30	14	23
180	250	0	–20	25	25	15	‒	15	25
250	315	0	–25	31	31	19	‒	19	30
315	400	0	–28	35	35	21	‒	21	35
400	500	0	–33	41	41	25	‒	25	40
500	630	0	–38	48	48	29	‒	29	50
630	800	0	–45	56	56	34	‒	34	60
800	1000	0	–60	75	75	45	‒	45	75

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. t_ΔCs, t_ΔC1s, t_VCs and t_VC1s are identical to t_ΔBs and t_VBs for the inner ring of the corresponding bearing ➤ Table
2. Applies before assembly of the bearing and after removal of internal and/or external snap rings.

Radial bearings, excluding tapered roller bearings

Tolerance class 5, inner ring

Nominal bore diameter		Bore deviation		Variation			Radial runout	Axial runout
d		tΔdmp		tVdsp		tVdmp	tKia	tSd
				μm
				max.
mm		μm		Diameter series		μm	μm	μm
over	incl.	U	L	9	0, 1, 2, 3, 4	max.	max.	max.
‒	2,5	0	–5	5	4	3	4	7
2,5	10	0	–5	5	4	3	4	7
10	18	0	–5	5	4	3	4	7
18	30	0	–6	6	5	3	4	8
30	50	0	–8	8	6	4	5	8
50	80	0	–9	9	7	5	5	8
80	120	0	–10	10	8	5	6	9
120	180	0	–13	13	10	7	8	10
180	250	0	–15	15	12	8	10	11
250	315	0	–18	18	14	9	13	13
315	400	0	–23	23	18	12	15	15

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

Tolerance class 5, width tolerances, inner ring

Nominal bore diameter		Deviation of inner ring width			Variation of inner ring width	Axial runout of lateral inner ring face
d		tΔBs			tVBs	tSia1)
		μm
mm		All	Normal	Modified2)	μm	μm
over	incl.	U	L	L	max.	max.
‒	2,5	0	–40	–250	5	7
2,5	10	0	–40	–250	5	7
10	18	0	–80	–250	5	7
18	30	0	–120	–250	5	8
30	50	0	–120	–250	5	8
50	80	0	–150	–250	6	8
80	120	0	–200	–380	7	9
120	180	0	–250	–380	8	10
180	250	0	–300	–500	10	13
250	315	0	–350	–500	13	15
315	400	0	–400	–630	15	20

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. Only for deep groove and angular contact ball bearings.
2. Only for bearings manufactured specifically for use as matched pairs, with the exception of deep groove ball bearings.

Tolerance class 5, outer ring¹⁾

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. t_ΔCs is identical to t_ΔBs for the inner ring of the corresponding bearing ➤ Table.
2. No values are given for radial ball bearings with sealing shields or sealing washers.
3. Applies before assembly of the bearing and after removal of internal and/or external snap rings.
4. Only for deep groove and angular contact ball bearings.

Radial bearings, excluding tapered roller bearings

Tolerance class 4, inner ring

Nominal bore diameter		Bore deviation		Deviation of a single bore diameter		Variation			Radial runout
d		tΔdmp		tΔds		tVdsp		tVdmp	tKia
		μm		μm		μm
		Diameter series
mm		9		0, 1, 2, 3, 4		9	0, 1, 2, 3, 4	μm	μm
over	incl.	U	L	U	L	max.	max.	max.	max.
‒	2,5	0	–4	0	–4	4	3	2	2,5
2,5	10	0	–4	0	–4	4	3	2	2,5
10	18	0	–4	0	–4	4	3	2	2,5
18	30	0	–5	0	–5	5	4	2,5	3
30	50	0	–6	0	–6	6	5	3	4
50	80	0	–7	0	–7	7	5	3,5	4
80	120	0	–8	0	–8	8	6	4	5
120	180	0	–10	0	–10	10	8	5	6
180	250	0	–12	0	–12	12	9	6	8

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

Tolerance class 4, width tolerances, inner ring

Nominal bore diameter		Deviation of inner ring width			Variation of inner ring width	Axial runout
d		tΔBs			tVBs	tSia1)	tSd
		μm
mm		All	Normal	Modified2)	μm	μm	μm
over	incl.	U	L	L	max.	max.	max.
‒	2,5	0	–40	–250	2,5	3	3
2,5	10	0	–40	–250	2,5	3	3
10	18	0	–80	–250	2,5	3	3
18	30	0	–120	–250	2,5	4	4
30	50	0	–120	–250	3	4	4
50	80	0	–150	–250	4	5	5
80	120	0	–200	–380	4	5	5
120	180	0	–250	–380	5	7	6
180	250	0	–300	–500	6	8	7

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. Only for deep groove and angular contact ball bearings.
2. Only for bearings manufactured specifically for use as matched pairs, with the exception of deep groove ball bearings.

Tolerance class 4, outer ring

Nominal size of outside diameter		Deviation of outside diameter		Deviation of a single outside diameter		Variation			Radial runout
D		tΔDmp		tΔDs		tVDsp1)		tVDmp	tKea
		μm		μm		μm
						max.
		Diameter series
mm		9		0, 1, 2, 3, 4		9	0, 1, 2, 3, 4	μm	μm
over	incl.	U	L	U	L			max.	max.
‒	6	0	–4	0	–4	4	3	2	3
6	18	0	–4	0	–4	4	3	2	3
18	30	0	–5	0	–5	5	4	2,5	4
30	50	0	–6	0	–6	6	5	3	5
50	80	0	–7	0	–7	7	5	3,5	5
80	120	0	–8	0	–8	8	6	4	6
120	150	0	–9	0	–9	9	7	5	7
150	180	0	–10	0	–10	10	8	5	8
180	250	0	–11	0	–11	11	8	6	10
250	315	0	–13	0	–13	13	10	7	11
315	400	0	–15	0	–15	15	11	8	13
continued ▼

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. No values are given for bearings with sealing shields or sealing washers.

Tolerance class 4, outer ring

Nominal size of outside diameter		Perpendicularity	Axial runout	Deviation of a single outer ring width	Variation of outer ring width
D		tSD tSD1	tSea1)	tΔCs	tVCs
mm		μm	μm	μm	μm
over	incl.	max.	max.		max.
‒	6	2	5	tΔCs is identical to tΔBs for the inner ring of the corresponding bearing ➤ Table	2,5
6	18	2	5		2,5
18	30	2	5		2,5
30	50	2	5		2,5
50	80	2	5		3
80	120	2,5	6		4
120	150	2,5	7		5
150	180	2,5	8		5
180	250	3,5	10		7
250	315	4	10		7
315	400	5	13		8
continued ▲

1. Only for deep groove and angular contact ball bearings.

Radial bearings, excluding tapered roller bearings

Tolerance class 2, inner ring

Nominal bore diameter		Bore deviation		Deviation of a single bore diameter		Variation		Radial runout
d		tΔdmp		tΔds		tVdsp	tVdmp	tKia
		μm		μm
		Diameter series
mm		9		0, 1, 2, 3, 4		μm	μm	μm
over	incl.	U	L	U	L	max.	max.	max.
‒	2,5	0	–2,5	0	–2,5	2,5	1,5	1,5
2,5	10	0	–2,5	0	–2,5	2,5	1,5	1,5
10	18	0	–2,5	0	–2,5	2,5	1,5	1,5
18	30	0	–2,5	0	–2,5	2,5	1,5	2,5
30	50	0	–2,5	0	–2,5	2,5	1,5	2,5
50	80	0	–4	0	–4	4	2	2,5
80	120	0	–5	0	–5	5	2,5	2,5
120	150	0	–7	0	–7	7	3,5	2,5
150	180	0	–7	0	–7	7	3,5	5
180	250	0	–8	0	–8	8	4	5

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

Tolerance class 2, width tolerances, inner ring

Nominal bore diameter		Deviation of inner ring width			Axial runout		Variation of inner ring width
d		tΔBs			tSd	tSia1)	tVBs
		μm
mm		All	Normal	Modified2)	μm	μm	μm
over	incl.	U	L	L	max.	max.	max.
‒	2,5	0	–40	–250	1,5	1,5	1,5
2,5	10	0	–40	–250	1,5	1,5	1,5
10	18	0	–80	–250	1,5	1,5	1,5
18	30	0	–120	–250	1,5	2,5	1,5
30	50	0	–120	–250	1,5	2,5	1,5
50	80	0	–150	–250	1,5	2,5	1,5
80	120	0	–200	–380	2,5	2,5	2,5
120	150	0	–250	–380	2,5	2,5	2,5
150	180	0	–250	–380	4	5	4
180	250	0	–300	–500	5	5	5

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. Only for deep groove and angular contact ball bearings.
2. Only for bearings manufactured specifically for use as matched pairs, with the exception of deep groove ball bearings.

Tolerance class 2, outer ring

Nominal outside diameter		Deviation of outside diameter				Variation		Radial runout
D		tΔDmp		tΔDs		tVDsp1)	tVDmp	tKea
		μm		μm
		Diameter series
mm		9		0, 1, 2, 3, 4		μm	μm	μm
over	incl.	U	L	U	L	max.	max.	max.
‒	6	0	–2,5	0	–2,5	2,5	1,5	1,5
6	18	0	–2,5	0	–2,5	2,5	1,5	1,5
18	30	0	–4	0	–4	4	2	2,5
30	50	0	–4	0	–4	4	2	2,5
50	80	0	–4	0	–4	4	2	4
80	120	0	–5	0	–5	5	2,5	5
120	150	0	–5	0	–5	5	2,5	5
150	180	0	–7	0	–7	7	3,5	5
180	250	0	–8	0	–8	8	4	7
250	315	0	–8	0	–8	8	4	7
315	400	0	–10	0	–10	10	5	8
continued ▼

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. No values are given for bearings with sealing shields or sealing washers.

Tolerance class 2, outer ring

Nominal outside diameter		Perpendicularity	Axial runout	Deviation of a single outer ring width	Variation of outer ring width
D		tSD tSD1	tSea1)	tΔCs	tVCs
mm		μm	μm	μm	μm
over	incl.	max.	max.	max.	max.
‒	6	0,75	1,5	tΔCs is identical to tΔBs for the inner ring of the corresponding bearing ➤ Table	1,5
6	18	0,75	1,5		1,5
18	30	0,75	2,5		1,5
30	50	0,75	2,5		1,5
50	80	0,75	4		1,5
80	120	1,25	5		2,5
120	150	1,25	5		2,5
150	180	1,25	5		2,5
180	250	2	7		4
250	315	2,5	7		5
315	400	3,5	8		7
continued ▲

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. Only for deep groove and angular contact ball bearings.

Bearings with tapered bore

Tolerances for tapered bores in accordance with ISO 492, taper 1:12, tolerance class Normal

Nominal bore diameter		Bore deviation		Variation	Deviation of taper slope
d		tΔdmp		tVdsp1)	tΔSL
mm		μm		μm	μm
over	incl.	U	L	max.	U	L
18	30	+33	0	13	+21	0
30	50	+39	0	16	+25	0
50	80	+46	0	19	+30	0
80	120	+54	0	22	+35	0
120	180	+63	0	40	+40	0
180	250	+72	0	46	+46	0
250	315	+81	0	52	+52	0
315	400	+89	0	57	+57	0
400	500	+97	0	63	+63	0
500	630	+110	0	70	+70	0
630	800	+125	0	‒	+80	0
800	1 000	+140	0	‒	+90	0

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. Valid in any radial cross-section of the bore.

Tolerances for tapered bores, taper 1:30, tolerance class Normal

Nominal bore diameter		Bore deviation		Variation	Deviation of taper slope
d		tΔdmp		tVdsp1)	tΔSL
mm		μm		μm	μm
over	incl.	U	L	max.	U	L
‒	80	+15	0	19	+35	0
80	120	+20	0	25	+40	0
120	180	+25	0	31	+50	0
180	250	+30	0	38	+55	0
250	315	+35	0	44	+60	0
315	400	+40	0	50	+65	0
400	500	+45	0	56	+75	0
500	630	+50	0	63	+85	0
630	800	+75	0	‒	+100	0
800	1 000	+100	0	‒	+100	0

Tolerance symbols in accordance with ISO 492 ➤ Table
U = upper limit deviation
L = lower limit deviation

1. Valid in any radial cross-section of the bore.

Taper 1:12

Taper 1:12 is standardised

For rolling bearings with a tapered bore, the standardised taper is 1:12. This corresponds to a half taper angle (α/2 = 2°23′9,4″); basic taper angle α = 4°46′18,8″. An exception is spherical roller bearings of the dimension series 40, 41 and 42 (the taper in this case is 1:30).

For the dimensions and tolerances defined in ISO 492:2014 for a tapered bore ➤ Figure.

Tolerances for tapered bores Taper 1:12 Half of taper angle α/2 = 2°23′9,4″; theoretical large end diameter d1 = d + 1/12 · B SL = d1 - d = 2B · tan(α/2) ΔSL = Δd1mp – Δdmp

Axial bearings

Bore diameter tolerances for shaft locating washers to ISO 199:2014

Nominal bore diameter		Tolerance class Normal, 6 and 5			Tolerance class 4
		Bore deviation		Variation	Bore deviation		Variation
d		tΔdmp		tVdsp	tΔdmp		tVdsp
mm		μm		μm	μm		μm
over	incl.	U	L	max.	U	L	max.
‒	18	0	–8	6	0	–7	5
18	30	0	–10	8	0	–8	6
30	50	0	–12	9	0	–10	8
50	80	0	–15	11	0	–12	9
80	120	0	–20	15	0	–15	11
120	180	0	–25	19	0	–18	14
180	250	0	–30	23	0	–22	17
250	315	0	–35	26	0	–25	19
315	400	0	–40	30	0	–30	23
400	500	0	–45	34	0	–35	26
500	630	0	–50	38	0	–40	30
630	800	0	–75	55	0	–50	40
800	1000	0	–100	75	0	‒	‒
1000	1250	0	–125	95	0	‒	‒

Tolerance symbols in accordance with ISO 199 ➤ Table
U = upper limit deviation
L = lower limit deviation

Outside diameter tolerances for housing locating washers to ISO 199:2014

Nominal outside diameter		Tolerance class Normal, 6 and 5			Tolerance class 4
		Deviation of outside diameter		Variation	Deviation of outside diameter		Variation
D		tΔDmp		tVDsp	tΔDmp		tVDsp
mm		μm		μm	μm		μm
over	incl.	U	L	max.	U	L	max.
10	18	0	–11	8	0	–7	5
18	30	0	–13	10	0	–8	6
30	50	0	–16	12	0	–9	7
50	80	0	–19	14	0	–11	8
80	120	0	–22	17	0	–13	10
120	180	0	–25	19	0	–15	11
180	250	0	–30	23	0	–20	15
250	315	0	–35	26	0	–25	19
315	400	0	–40	30	0	–28	21
400	500	0	–45	34	0	–33	25
500	630	0	–50	38	0	–38	29
630	800	0	–75	55	0	–45	34
800	1000	0	–100	75	0	–60	45
1000	1250	0	–125	95	‒	‒	‒
1250	1600	0	–160	120	‒	‒	‒

Tolerance symbols in accordance with ISO 199 ➤ Table
U = upper limit deviation
L = lower limit deviation

Variation in washer thickness for shaft and housing locating washers to ISO 199:2014

Nominal bore diameter		Tolerance class				Tolerance class Normal, 6, 5, 4
d		Normal	6	5	4
		Variation in thickness between shaft washer raceway and back face				Variation in thickness between housing washer raceway and back face
		tSi				tSe
mm		μm				μm
over	incl.	max.				max.
‒	18	10	5	3	2	Identical to tSi for the shaft locating washer of the corresponding bearing
18	30	10	5	3	2
30	50	10	6	3	2
50	80	10	7	4	3
80	120	15	8	4	3
120	180	15	9	5	4
180	250	20	10	5	4
250	315	25	13	7	5
315	400	30	15	7	5
400	500	30	18	9	6
500	630	35	21	11	7
630	800	40	25	13	8
800	1 000	45	30	15	‒
1 000	1 250	50	35	18	‒

Tolerance symbols in accordance with ISO 199 ➤ Table

Tolerances for nominal bearing height

Tolerances and symbols for nominal size

The tolerances for nominal height are given in ➤ Table. The corresponding symbols for nominal size are shown in ➤ Figure.

Nominal size symbols for nominal bearing height

Tolerances for nominal bearing height

Nominal bore diameter		tTs		tT1s		tT2s
d
mm		μm		μm		μm
over	incl.	U	L	U	L	U	L
‒	30	20	–250	100	–250	150	–400
30	50	20	–250	100	–250	150	–400
50	80	20	–300	100	–300	150	–500
80	120	25	–300	150	–300	200	–500
120	180	25	–400	150	–400	200	–600
180	250	30	–400	150	–400	250	–600
250	315	40	–400	200	–400	350	–700
315	400	40	–500	200	–500	350	–700
400	500	50	–500	300	–500	400	–900
500	630	60	–600	350	–600	500	–1 100
630	800	70	–750	400	–750	600	–1 300
800	1 000	80	–1 000	450	–1 000	700	–1 500
1 000	1 250	100	–1 400	500	–1 400	900	–1 800
continued ▼

Tolerance symbols in accordance with ISO 199 ➤ Table
U = upper limit deviation
L = lower limit deviation

Tolerances for nominal bearing height

Nominal bore diameter		tT3s		tT4s
d
mm		μm		μm
over	incl.	U	L	U	L
‒	30	300	–400	20	–300
30	50	300	–400	20	–300
50	80	300	–500	20	–400
80	120	400	–500	25	–400
120	180	400	–600	25	–500
180	250	500	–600	30	–500
250	315	600	–700	40	–700
315	400	600	–700	40	–700
400	500	750	–900	50	–900
500	630	900	–1 100	60	–1 200
630	800	1 100	–1 300	70	–1 400
800	1 000	1 300	–1 500	80	–1 800
1000	1 250	1 600	–1 800	100	–2 400
continued ▲

Tolerance symbols in accordance with ISO 199 ➤ Table
U = upper limit deviation
L = lower limit deviation

Chamfer dimensions

Radial bearings, excluding tapered roller bearings

Minimum and maximum values

The minimum and maximum values for the bearings are given in the table Limit values for chamfer dimensions to DIN 620-6 ➤ Table, ➤ Figure.

For drawn cup needle roller bearings with open ends HK, drawn cup needle roller bearings with closed end BK and aligning needle roller bearings PNA and RPNA, the chamfer dimensions deviate from DIN 620-6. The lower limit values for r are given in the product tables.

Tapered roller bearings

Chamfer dimensions for tapered roller bearings ➤ Figure and ➤ Table, for axial bearings ➤ Figure and ➤ Table.

Chamfer dimensions for radial bearings (not including tapered roller bearings) Symmetrical ring cross-section with identical chamfers on both rings Symmetrical ring cross-section with different chamfers on both rings Asymmetrical ring cross-section Annular slot on outer ring, bearing with rib washer L-section ring

Limit values for chamfer dimensions to DIN 620-6

r1)	d		r1 to r6a	r1, r3, r5	r2, r4, r62)	r4a, r6a
mm	mm		mm	mm	mm	mm
	over	incl.	min.	max.	max.	max.
0,05	‒	‒	0,05	0,1	0,2	0,1
0,08	‒	‒	0,08	0,16	0,3	0,16
0,1	‒	‒	0,1	0,2	0,4	0,2
0,15	‒	‒	0,15	0,3	0,6	0,3
0,2	‒	‒	0,2	0,5	0,8	0,5
0,3	‒	40	0,3	0,6	1	0,8
0,3	40	‒	0,3	0,8	1	0,8
0,5	‒	40	0,5	1	2	1,5
0,5	40	‒	0,5	1,3	2	1,5
0,6	‒	40	0,6	1	2	1,5
0,6	40	‒	0,6	1,3	2	1,5
1	‒	50	1	1,5	3	2,2
1	50	‒	1	1,9	3	2,2
1,1	–	120	1,1	2	3,5	2,7
1,1	120	‒	1,1	2,5	4	2,7
1,5	‒	120	1,5	2,3	4	3,5
1,5	120	‒	1,5	3	5	3,5
2	‒	80	2	3	4,5	4
2	80	220	2	3,5	5	4
2	220	‒	2	3,8	6	4
2,1	‒	280	2,1	4	6,5	4,5
2,1	280	‒	2,1	4,5	7	4,5
2,5	‒	100	2,5	3,8	6	5
2,5	100	280	2,5	4,5	6	5
2,5	280	‒	2,5	5	7	5
3	‒	280	3	5	8	5,5
3	280	‒	3	5,5	8	5,5
4	‒	‒	4	6,5	9	6,5
5	‒	‒	5	8	10	8
6	‒	‒	6	10	13	10
7,5	‒	‒	7,5	12,5	17	12,5
9,5	‒	‒	9,5	15	19	15
12	‒	‒	12	18	24	18
15	‒	‒	15	21	30	21
19	‒	‒	19	25	38	25

1. The nominal chamfer dimension r is identical to the smallest permissible chamfer dimension r_min.
2. For bearings with a width of 2 mm or less, the values for r₁ apply.

Tapered roller bearings

Minimum and maximum values

Minimum and maximum values for metric tapered roller bearings ➤ Figure and ➤ Table.

Chamfer dimensions for metric tapered roller bearings

Limit values for chamfer dimensions

r1)	d, D		r1 to r4	r1, r3	r2, r4
mm	mm		mm	mm	mm
	over	incl.	min.	max.	max.
0,3	‒	40	0,3	0,7	1,4
0,3	40	‒	0,3	0,9	1,6
0,6	‒	40	0,6	1,1	1,7
0,6	40	‒	0,6	1,3	2
1	‒	50	1	1,6	2,5
1	50	‒	1	1,9	3
1,5	‒	120	1,5	2,3	3
1,5	120	250	1,5	2,8	3,5
1,5	250	‒	1,5	3,5	4
2	‒	120	2	2,8	4
2	120	250	2	3,5	4,5
2	250	‒	2	4	5
2,5	‒	120	2,5	3,5	5
2,5	120	250	2,5	4	5,5
2,5	250	‒	2,5	4,5	6
3	‒	120	3	4	5,5
3	120	250	3	4,5	6,5
3	250	400	3	5	7
3	400	‒	3	5,5	7,5
4	‒	120	4	5	7
4	120	250	4	5,5	7,5
4	250	400	4	6	8
4	400	‒	4	6,5	8,5
5	‒	180	5	6,5	8
5	180	‒	5	7,5	9
6	‒	180	6	7,5	10
6	180	‒	6	9	11

1. The nominal chamfer dimension r is identical to the smallest permissible chamfer dimension r_min.

Axial bearings

Minimum and maximum values

Minimum and maximum values for the bearings ➤ Figure and ➤ Table. The values in the table correspond to DIN 620-6. In the case of axial deep groove ball bearings, the tolerances for the chamfer dimensions are identical in both axial and radial directions.

Chamfer dimensions for axial bearings Single direction axial deep groove ball bearing with flat housing locating washer Double direction axial deep groove ball bearing with spherical housing locating washers and seating washers Single direction axial cylindrical roller bearing Single direction axial spherical roller bearing

Limit values for chamfer dimensions

r1)	r1, r2
mm	mm	mm
	min.	max.
0,05	0,05	0,1
0,08	0,08	0,16
0,1	0,1	0,2
0,15	0,15	0,3
0,2	0,2	0,5
0,3	0,3	0,8
0,6	0,6	1,5
1	1	2,2
1,1	1,1	2,7
1,5	1,5	3,5
2	2	4
2,1	2,1	4,5
3	3	5,5
4	4	6,5
5	5	8
6	6	10
7,5	7,5	12,5
9,5	9,5	15
12	12	18
15	15	21
19	19	25

1. The nominal chamfer dimension r is identical to the smallest permissible chamfer dimension r_min.