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 = |  |
||
| GB = |  |
||
| GMM = |  |
||
| Matched set of single direction bearings | |||
| BSA 208 C/TFTA | where | BSA 208 = | |
| C = | |
||
| TFT = |  |
||
| 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 = | |
||
| 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.) |
