SKF - Rolling Bearings

Basic bearing designation system
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.
These letters are used to identify differences
in internal design.
The most common series designations are
shown in diagram 2 († page 43) above the
illustrations. The digits in brackets are omitted
in the series designation.
Prefixes and suffixes
Prefixes and suffixes provide additional information
about the bearing. Prefixes and suffixes
and their significance are explained in the
relevant product chapter.
Prefixes
Prefixes are mainly used to identify components
of a bearing. They can also identify
bearing variants.
Suffixes
Suffixes identify designs or variants, which
differ in some way from the original design or
from the current basic design. The suffixes are
divided into groups. When more than one special
feature is to be identified, suffixes are provided
in the order shown in diagram 3.
Bearing designations not covered by the
basic bearing designation system
Y-bearings (insert bearings)
The designations for Y-bearings differ somewhat
from the system described above and
are covered in the relevant product chapter.
Needle roller bearings
The designations for needle roller bearings do
not fully follow the system described above
and are covered in the relevant product
chapter.
Tapered roller bearings
The designations for metric tapered roller
bearings follow either the system described
above or a designation system established by
ISO in 1977 († ISO 355). Inch tapered roller
bearings are designated in accordance with
the relevant ANSI/ABMA standard.
The designation system for tapered roller
bearings is explained in the relevant product
chapter.
Customized bearings
Bearings designed to meet a specific customer
requirement are typically designated by a
drawing number. The drawing number does
not provide any information about the bearing.
Other rolling bearings
Rolling bearings not covered in this catalogue,
such as super-precision bearings, thin section
bearings, slewing bearings or linear bearings
follow designation systems, which can differ
significantly from the system described above.
Information about these designation systems
is provided in the relevant catalogues.
A
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