Page 33 - Rollingbearings

Basic bearing designation system
Basic designations 4 For some bearings with a bore diameter
< 10 mm, such as deep groove, self-
A basic designation typically contains three aligning and angular contact ball bearings,
to ive digits. The basic designation system is the bore diameter is also given in millime-
shown in table 4. The number and letter tres (uncoded) but is not separated from
combinations have the following meaning: the series designation by an oblique
stroke, e.g. 629 or 129 (d = 9 mm).
• The irst digit or letter or combination of 5 Bore diameters that deviate from the
letters identiies the bearing type and standard bore diameter of a bearing are
eventually a basic variant. uncoded and given in millimetres up to
• The following two digits identify the ISO three decimal places. This bore diameter
dimension series. The irst digit indicates the identiication is part of the basic designation
width or height series (dimensions B, T or and is separated by an oblique stroke, e.g. Bearing basics
H). The second digit identiies the diameter 6202/15.875 (d = 15,875 mm = 5/8 in).
series (dimension D).
• The last two digits of the basic designation
identify the size code of the bearing bore. Bearing series
The size code multiplied by 5 gives the A.1
bore diameter (d) in mm. Bearing series designations consist of an
identiication for the bearing type and the
The most important exceptions in the basic dimension series. The most common series
bearing designation system are: designations are shown in table 4. The digits
in brackets belong to the system, but are not
1 In a few cases the digit for the bearing type used in the series designation in practice.
or the irst digit of the dimension series
identiication is omitted. These digits are
shown in brackets in table 4.
2 Bearings with a bore diameter of 10, 12,
15 or 17 mm have the following size code
identiications:
00 = 10 mm
01 = 12 mm
02 = 15 mm
03 = 17 mm
3 For bearings with a bore diameter
< 10 mm, or ≥ 500 mm, the bore diameter
is generally given in millimetres (uncoded).
The size identiication is separated from
the rest of the bearing designation by an
oblique stroke, e.g. 618/8 (d = 8 mm) or
511/530 (d = 530 mm). This is also true for
standard bearings in accordance with
ISO 15 that have a bore diameter of 22, 28
or 32 mm, e.g. 62/22 (d = 22 mm).

31