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.

Examples
Single direction bearing | |||
BSA 205 CGB/GMM | where | BSA 205 = | ![]() |
C = | ![]() |
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GB = | ![]() |
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GMM = | ![]() |
Matched set of single direction bearings | |||
BSA 208 C/TFTA | where | BSA 208 = | ![]() |
C = | ![]() |
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TFT = | ![]() |
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A = | ![]() |
Double direction bearing | |||
BEAM 030080 C-2RSH/PE | where | BEAM 030080 C = | ![]() |
-2RSH = | ![]() |
||
PE = | ![]() |
Cartridge unit | |||
FBSA 206 A/QBCA | where | FBSA 206 = | ![]() |
A = | ![]() |
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QBC = | ![]() |
||
A = | ![]() |
Applicable options for angular contact ball bearings
![]() | Prefixes (n.a.) |
![]() | Basic designation |
Bearing series | |
BSA 2 | Single direction bearing in accordance with ISO dimension series 02
|
BSA 3
| Single direction bearing in accordance with ISO dimension series 03 |
BSD | Single direction bearing |
BEAS | Double direction bearing |
BEAM | Double direction bearing for bolt mounting |
FBSA 2 | Cartridge unit with a flanged housing |
Bearing size for single direction bearings in accordance with an ISO dimension series
|
|
01 | 12 mm bore diameter |
02 | 15 mm bore diameter |
03 | 17 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 |
![]() | Suffixes - Internal design |
C | Improved internal design
|
![]() | 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 | |
GA | Universally matchable, light preload |
GB | Universally matchable, moderate preload |
G... | Universally matchable, special preload, expressed in daN e.g. G240 |
Sealing solutions | |
-2RSH | Contact seal, NBR, on both sides (double direction bearings)
|
-2RSL | Non-contact seal, NBR, on both sides (double direction bearings)
|
-2RZ | Non-contact seal, NBR, on both sides (single direction bearings) |
![]() | Suffixes - Cage design (n.a.) |
![]() | Suffixes - Materials, heat treatment (n.a.) |
![]() | Suffixes - Accuracy, clearance, preload, quiet running, grease fill
|
|
Grease fill
|
||
GMM | Open single direction bearing filled with standard grease | |
Accuracy | ||
– | Super precision tolerance class
|
|
PE | Less stringent tolerance class
|
![]() | Suffixes - Bearing sets, matched bearings | |
Arrangement | ||
DB | Set of two bearings arranged back-to-back <> | |
DF | Set of two bearings arranged face-to-face >< | |
DT | Set of two bearings arranged in tandem << | |
TBT
| Set of three bearings arranged back-to-back and tandem <>> | |
TFT | Set of three bearings arranged face-to-face and tandem ><< | |
TT | Set of three bearings arranged in tandem <<<
|
|
QBC | Set of four bearings arranged tandem back-to-back <<>> | |
QFC | Set of four bearings arranged tandem face-to-face >><< | |
QBT | Set of four bearings arranged back-to-back and tandem <>>> | |
QFT | Set of four bearings arranged face-to-face and tandem ><<< | |
QT | Set of four bearings arranged in tandem <<<<
|
|
Preload | ||
A | Light preload | |
B | Moderate preload | |
G... | Special preload, expressed in daN e.g. G240 |
![]() | Suffixes - Stabilization (n.a.) |
![]() | Suffixes - Lubrication (See 6.2) |
![]() | Suffixes - Other variants (n.a.) |