SKF Designation system for rolling bearings.

28. July, 2010


Basic designations

All SKF standard bearings have a characteristic basic designation, which generally consists of three, four or five figures or a combination of  letters and figures. The design of the system used
for almost all standard ball and roller bearing types is shown schematically in diagram 1. The figures and combinations of letters and figures have the following meaning:
The first figure • or the first letter or combination of letters identifies the bearing type and eventually a basic variant.

• The following two figures identify the ISO dimension series; the first figure indicates the
width or height series (dimensions B, T or H) and the second the diameter series (dimension D).

• The last two figures of the basic designation
give the size code of the bearing; when multiplied
by 5, the bore diameter in millimetres is obtained.
The most important exceptions to the basic
bearing designation system are listed here.

1.  In a few cases, the figure for the bearing type
or the first figure of the dimension series
identification is omitted. These figures are
shown in brackets in diagram 1

2. Bearings with bore diameters of 10, 12, 15 or 17 mm have the following size code identifications:
00 = 10 mm
01 = 12 mm
02 = 15 mm
03 = 17 mm

3. For bearings having a bore diameter smaller than 10 mm, or 500 mm and larger, the bore diameter is generally given in millimetres and is not coded. The size identification
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 of standard bearings in accordance with ISO
15:1998 that have bore diameters of 22, 28 or 32 mm, e.g. 62/22 (d = 22 mm)

4. For some small bearings having a bore
diameter smaller than 10 mm, such as deep
groove, self-aligning and angular contact ball
bearings, the bore diameter is also given in
millimetres (uncoded) but is not separated
from the series designation by an oblique
stroke, e.g. 629, 129 or 709 (d = 9 mm).

5 . Bore diameters that deviate from standard
bore diameters are uncoded and given in
millimetres
up to three decimal places. This
bore diameter identification is part of the basic
designation and is separated from the basic
designation by an oblique stroke, e.g.
6202/15.875 (6202 bearing with a special
bore d = 15,875 mm = 5/8 in.).
Series designations
Each standard bearing belongs to a given bearing
series, which is identified by the basic designation
without the size identification. Series designations
often include a suffix A, B, C, D or E or a combination
of these letters, e.g. CA. These are used to
identify differences in internal design, e.g. contact
angle.
The most common bearing series designations
are shown in diagram 1, above the bearing
sketches. The figures in brackets are omitted
in the series designation.


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