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Designation system

The designations of SKF super-precision bearings follow a system that consists of a basic designation with or without one or more prefixes and/or suffixes.

Examples and the applicable options for angular contact thrust ball bearings for screw drives are given below.

Basic bearing designation system

Examples

Single direction bearing
BSA 205 CGB/GMMwhereBSA 205 =
C =
GB =
GMM =

Matched set of single direction bearings
BSA 208 C/TFTAwhereBSA 208 =
C =
TFT =
A =

Double direction bearing
BEAM 030080-2RS/PEwhereBEAM 030080 =
-2RS =
PE =

Cartridge unit
FBSA 206 A/QBCAwhereFBSA 206 =
A =
QBC =
A =

Applicable options for angular contact ball bearings

Test Designation 1
Prefixes (n.a.)

Test Designation 2
Basic designation
Bearing series
BSA 2Single direction bearing in accordance with ISO dimension series 02
BSA 3
Single direction bearing in accordance with ISO dimension series 03
BSDSingle direction bearing
BEASDouble direction bearing
BEAMDouble direction bearing for bolt mounting
FBSA 2Cartridge unit with a flanged housing
Bearing size for single direction bearings in accordance with an ISO dimension series
0112 mm bore diameter
0215 mm bore diameter
0317 mm bore diameter
04
to
15
(x5) 20 mm bore diameter

(x5) 75 mm bore diameter
Bearing size for single direction bearings, not standardized
2047
to
60120
20 mm bore diameter and 47 mm outside diameter

60 mm bore diameter and 120 mm outside diameter
Bearing size for double direction bearings
008032
to
060145
8 mm bore diameter and 32 mm outside diameter

60 mm bore diameter and 145 mm outside diameter

Catalogue image - Test Designation 3
Suffixes - Internal design
CImproved internal design (single direction bearings only)

Test Designation 4
Suffixes - External design (seals, snap ring groove etc.) Single bearing – execution and preload 
A
Different flange position (cartridge units only)
Single direction bearing – execution and preload
GAUniversally matchable, light preload
GBUniversally matchable, moderate preload
G...Universally matchable, special preload, expressed in daN e.g. G240
Sealing solutions
-2RSContact seal on both sides, NBR
-2RZNon-contact seal on both sides, NBR

Catalogue image - Test Designation 5
Suffixes - Cage design (n.a.)

Catalogue image - Test Designation 6.1
Suffixes - Materials, heat treatment (n.a.)

Test Designation 6.2
Suffixes - Accuracy, clearance, preload, quiet running, grease fill
Grease fill
GMMOpen single direction bearing filled with standard grease
Accuracy
Dimensional accuracy to ISO tolerance class 4, running accuracy to ISO tolerance class 2
PEEnlarged diameter tolerance and axial run-out to P5 tolerance class for radial bearing (BEAM/BEAS series only)

Catalogue image - Test Designation 6.3
Suffixes - Bearing sets, matched bearings
Arrangement
DBSet of two bearings arranged back-to-back <>
DFSet of two bearings arranged face-to-face ><
DTSet of two bearings arranged in tandem <<
TBT
Set of three bearings arranged back-to-back and tandem <>>
TFTSet of three bearings arranged face-to-face and tandem ><<
TTSet of three bearings arranged in tandem <<<
QBCSet of four bearings arranged tandem back-to-back <<>>
QFCSet of four bearings arranged tandem face-to-face >><<
QBTSet of four bearings arranged back-to-back and tandem <>>>
QFTSet of four bearings arranged face-to-face and tandem ><<<
QTSet of four bearings arranged in tandem <<<<
Preload
ALight preload
BModerate preload
G...Special preload, expressed in daN e.g. G240

Test Designation 6.4
Suffixes - Stabilization (n.a.)


Suffixes - Lubrication (See 6.2)

Test Designation 6.6
Suffixes - Other variants (n.a.)
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