ICS 21.100.20
Wälzlager – Kugeln für Wälzlager und allgemeinen Industriebedarf
In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker.
Ref.No.DIN 5401:2002-08
English price group 11
Sales No.0111
09.04
DEUTSCHE NORM August 2002
©No part of this translation may be reproduced without the prior permission of
DIN Deutsches Institut für Normung e.V., Berlin. Beuth Verlag GmbH , 10772Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).
Translation by DIN-Sprachendienst.
In case of doubt, the German-language original should be consulted as the authoritative text.
Balls for rolling bearings and general
industrial use
Continued on pages 2 to 14.
Supersedes DIN 5401-1 and DIN 5401-2,
November 1993 editions.
5401
{
Foreword
This standard has been prepared by the Arbeitsausschuss Wälzlager  (Rolling Bearings Standards Commit-tee).
Ball sizes are also expressed in inches, for guidance. It should be noted, however, that the use of such units is prohibited under Council Directive 80/181/EEC.
See Explanatory notes for connection with International Standard ISO 3290:2001 published by the Inter-national Organization for Standardization (ISO).
Amendments
This standard differs from DIN 5401-1 and DIN 5401-2, November 1993 editions, as follows:a)The two parts of the standard have been combined into one standard.b)Further steel grades have been specified.c)The range of ball sizes has been updated.d)Further concepts are defined.
e)The standard has been editorially revised.
Previous editions
DIN 5401:1953-01,1956-04, 1959-11, 1964-01, 1978-01; DIN 5401-1:1993-11; DIN 5401-2:1993-11.
1Scope
This standard specifies requirements for balls for rolling bearings and for general industrial use. It covers balls made of full hardening steel, special steel and other metallic or non-metallic materials.
Page 2
DIN 5401:2002-08
2Normative references
This standard incorporates, by dated or undated reference, provisions from other publications. These norma-tive references are cited at the appropriate places in the text and the titles of the publications are listed below.For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies.
DIN EN 10016-2
Non-alloy steel rod for drawing or cold rolling – Specific requirements for general purpose rod
DIN EN 10088-3Stainless steels – Part 3: Technical delivery conditions for general purpose semi-finished
products, bars, rod and sections
DIN EN 10263-3Steel rod, bars and wire for cold heading and cold extrusion – Part 3: Technical delivery
conditions for case hardening steels
DIN EN 12163Copper and copper alloys – Rod for general purposes DIN EN 12166Copper and copper alloys – Wire for general purposes
DIN EN ISO 683-17Heat-treated steels, alloy steels and free-cutting steels – Part 17: Ball and roller bearing
steels (ISO 683-17:1999)
DIN EN ISO 4288GPS – Surface texture: Profile method – Rules and procedures for the assessment of
surface texture (ISO 4288:1996)
DIN EN ISO 6506-1Metallic materials – Brinell hardness test – Part 1: Test method (ISO 6506-1:1999)DIN EN ISO 6507-1Metallic materials – Vickers hardness test – Part 1: Test method (ISO 6507-1:1997)DIN EN ISO 6508-1Metallic materials – Rockwell hardness test – Part 1: Test method (scales A, B, C, D, E,
F, G, H, K, N, T) (ISO 6508-1:1999)
ISO 4291:1985Methods for the assessment of departure from roundness – Measurement of variations
in radius
ISO 3290:2001Rolling bearings – Balls – Dimensions and tolerances
Council Directive of 20 December 1979 on the approximation of the laws of the Member States relating to units of measurement, EC Official Gazette, 1980, No. L 39, pp. 40–50 (80/181/EEC)3
Concepts
3.1Nominal ball diameter The diameter used to identify a ball size; designated by D w .
3.2Single ball diameter The distance between two parallel planes tangential to the surface of a ball; designated by D ws .
3.3Mean ball diameter The arithmetical mean of the largest and the smallest of the single diameters of a ball; designated by D wm .3.4Ball diameter variation The difference between the largest and smallest of the single diameters of a ball; designated by V Dws .3.5
Deviation from spherical form
The greatest radial distance, in any equatorial plane, between the smallest circumscribed sphere and the greatest inscribed sphere, calculated using the least squares centre method; designated by t Dws .
NOTE:Information regarding the measurement of the deviation from spherical form is given in Annex B.
3.6Lot
For the purposes of this standard, a definite quantity of balls manufactured under conditions which are pre-sumed uniform, and which is considered an entity.
3.7Lot mean diameter The arithmetic mean of the mean diameters of the largest ball and the smallest ball in a lot (designated by D wmL )3.8
Lot diameter variations
The difference between the mean diameter of the largest ball and the smallest ball in a lot; designated by V DwL .NOTE:This definition only applies to ball grades G3 to G200, except grade G80.
3.9Ball gauge tolerance
Range within which diameter D wmL  may vary for a particular ball gauge, designated by S T .
Page 3
DIN5401:2002-08
3.10Ball diameter variation within a gauge
The difference between the largest and the smallest mean ball diameters established for a particular gauge; designated by V
dwA
.
NOTE:This definition only applies to ball grades G500 to G700 and G80.
3.11Gauge interval
One of the intervals into which the limit deviation for the nominal diameter of a ball is divided; designated by I
G
.
3.12Ball grade
A specific combination of dimensional, form and sorting tolerances, and of surface roughness for balls. NOTE:A ball grade is identified by the letter G followed by a number.
3.13Ball gauge
The amount by which the mean ball diameter of a lot (for V
DwL ) or of a subset of a lot (for V
DwA
), differs from
the nominal ball diameter, rounded to a whole multiple of the ball gauge interval; designated by S.
3.14Gauge deviation
The maximum deviation of the mean ball diameter from the nominal diameter.
3.15Arithmetical mean deviation of the profile
The arithmetical average value of the departure of the profile of a surface from the mean line throughout a specified sampling length, with deviations of form and waviness being ignored; designated by R
a
.
3.16Waviness
Surface irregularities of random or periodical deviation from the ideal spherical form.
3.17Surface defect
Any deviation of the surface from the ideal spherical form. Surface defects include irregularities originating from manufacture (e.g. inhomogenous surface texture), mechanical damage, cracks or staining.
3.18Hardness
Measure of resistance to penetration as determined by specific methods.
NOTE:The values indicated in table 2 refer to Brinell hardness (HB), Vickers hardness (HV10) and Rockwell hardness (HRC), determined by the methods specified in DIN EN ISO6506-1, DIN EN ISO6507-1 and DIN EN ISO6508-1, respectively.
3.19Material group
Collective term to denote materials of specific properties.
editorially4Dimensions and designation
Recommended nominal diameters of steel balls shall be as specified in table 1, other sizes being subject to agreement.
The designation shall include the material number or name. Group 1 materials need not be included in the designation.
EXAMPLES:
Designation of a ball with a nominal diameter, D
w , of 6mm, made of hardened steel of grade 100 Cr6
(material number: 1.3505), ball grade G10:
Ball DIN5401 – 6 G10
Designation of a ball with a nominal diameter, D
w , of 6mm, made of hardened steel of grade X45Cr13
(material number: 1.3541), ball grade G20:
Ball DIN5401 – 6 G20 – 1.3541
Designation of a ball with a nominal diameter, D
w
, of 6mm, made of sintered ceramics, ball grade G5:
Ball DIN5401 – 6 G5 – Si3N4
Page4
DIN5401:2002-08
Table1:Nominal diameters and mass of steel balls
Approx. mass
Nominal ball diameter, D
w , in Size recommended for material of group2)per 1000 units
(7,85 g/cm3),
mm in1)123456789in kg3)
0,4X X X0,00026 0,5X X X0,00051 1X X X X X X X0,00411
1,5X X X X X X X X0,0139
1,5881/
16X X X X X X X X0,0165
2X X X X X X X X0,0329
2,3813/
32X X X X X X X X0,0555
2,5X X X X X X X X0,0642 2,7787/
64
X X X X X X0,0881 3X X X X X X X X0,111
3,1751/
8X X X X X X X X0,132
3,5X X X X X X X X0,176
3,9695/
32X X X X X X X X0,257
4X X X X X X X X0,263 4,5X X X X X X X X0,375
4,7623/
16X X X X X X X X0,444
5X X X X X X X X0,514 5,5X X X X X X X X0,684
5,5567/
32X X X X X X X X0,705
5,95315/
64
X X0,84 6X X X X X X X X X0,888
6,351/
4X X X X X X X X X1,05
6,5X X X X X X X X X1,13
6,74717/
64X X X1,26
7X X X X X X X X X1,41 7,1449/
32
X X X X X X X X X1,5 7,5X X X X X X X1,73
7,9385/
16X X X X X X X X X2,06
8X X X X X X X X X2,11 8,5X X X X X2,52
8,73111/
32
X X X X X X X X2,74 9X X X X X X X X3 9,5X X X X X X3,52
9,5253/
8
X X X X X X X X X3,55 10X X X X X X X X X4,11
10,31913/
32X X X X X X X4,52
10,5X X X X X X4,75 11X X X X X X X X X5,47
11,1127/
16X X X X X X X X X5,64
11,5X X X X6,25
11,90615/
32X X X X X X X6,94
12X X X X X X X X7,1 12,30331/
64
X X X7,65 12,5X X X X X8,03
12,71/
2X X X X X X X X X8,42
13X X X X X X X X X9,03
(continued)
Page 5
DIN5401:2002-08 Table1 (continued)
Approx. mass
Nominal ball diameter, D
w , in Size recommended for material of group2)per 1000 units
(7,85 g/cm3),
mm in1)123456789in kg3)
13,49417/
32X X X X X10,1
14X X X X X X X X X11,3 14,2889/
16
X X X X X X X12 15X X X X X X X X X13,9
15,08119/
32X X X X X14,1
15,8755/
8
X X X X X X X X X16,4 16X X X X X X X X X16,8
16,66921/
32X X X19
17X X X X X X X20,2
17,46211/
16X X X X21,9
18X X X X X X X X24 18,25623/
32
X X X25 19X X X X28,2
19,053/
4X X X X X X X28,4
19,84425/
32
X32,1 20X X X X X X X X32,9
20,5X35,4
20,63813/
16
X X X X X36,1 21X X38,1
21,43127/
32X40,5
22X X X X X X43,8
22,2257/
8X X X X X45,1
23X X X50
23,01929/
32X50,1
23,81215/
16X X X X55,5
24X X X X X56,8
24,60631/
32X X61,2
25X X X X X X X64,2 25,41X X X X67,4 26X X X72,2
26,98811/
16X X80,8
28X X X90,2
28,57511/
8X X X X X95,9
30X X X X X X111 30,16213/
16
X X113
31,7511/
4X X X X132
32X X135
33,33815/
16X152
34X162
34,92513/
8
X X175 35X X X X176 36X X192
36,51217/
16
X200 38X226
38,111/
2X X X X227
39,68819/
16
X257
(continued)

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