Designation system
The designations of SKF bearing accessories follow a system that consists of a product type and size designations with or without a suffix:

An example and the applicable options for adapter sleeves are given below.
Example
H 312 E | where | H = | ![]() |
312 = | ![]() |
||
E = | ![]() |
Applicable options for adapter sleeves
![]() | Product types |
H | Adapter sleeve, dimensions in accordance with ISO standard, basic design |
HA | Adapter sleeve, dimensions in accordance with ISO standard, except the bore, in 1/16 in. |
HE | Adapter sleeve, dimensions in accordance with ISO standard, except the bore, in 1/4 in. |
HS
| Adapter sleeve, dimensions in accordance with ISO standard, except the bore, in 1/8 in. |
OH
| Adapter sleeve, dimensions in accordance with ISO standard, prepared for oil injection |
OSNP
| Adapter sleeve, dimensions in accordance with ANSI standard, prepared for oil injection, with a locking plate |
OSNW
| Adapter sleeve, dimensions in accordance with ANSI standard, prepared for oil injection, with a lock washer |
SNP
| Adapter sleeve, dimensions in accordance with ANSI standard, with a locking plate |
SNW
| Adapter sleeve, dimensions in accordance with ANSI standard, with a lock washer |
KH
| Unthreaded sleeve, basic design |
KOH
| Unthreaded sleeve, prepared for oil injection |
![]() | Size identification |
| Listed in the product tables for: |
![]() | Suffixes |
B | For adapter sleeves for oil injection: One or two oil supply ducts at the end opposite the threaded section |
B | For adapter sleeves for inch shafts: Whitworth thread |
D | Sleeve split in two halves
|
E | Adapter sleeve without key slot, with a KMFE lock nut or standard adapter sleeve with an HME lock nut |
EH | Adapter sleeve without key slot, with a KMFE .. H lock nut |
EL | Adapter sleeve without key slot, with a KMFE .. L lock nut |
G | Thread diameter changed according to revised ISO standard |
H | One oil supply duct at the threaded end |
HB | One or two oil supply ducts at the threaded end |
L | Adapter sleeve with a lock nut with lower sectional height |
TL | Same as L, but with key slot positions for a locking clip |