SKF double row cylindrical roller bearings designation follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes
|
3 |
Suffixes - Internal design |
|
A, B, C |
Deviating or modified internal design |
|
4 |
Suffixes - External design (seals, snap ring groove etc.) |
|
G |
Helical groove in inner ring bore |
|
K |
Tapered bore, taper 1:12 |
|
K30 |
Tapered bore, taper 1:30 |
|
5 |
Suffixes - Cage design |
|
F |
Machined steel cage, roller centred |
|
M |
Machined brass cage, roller centred |
|
6.1 |
Suffixes - Materials, heat treatment |
|
HA1 |
Case-hardened inner and outer rings |
|
HA4 |
Case-hardened inner and outer rings and rollers |
|
HA5 |
Case-hardened rollers |
|
HB1 |
Bainite-hardened inner and outer rings |
|
6.2 |
Suffixes - Accuracy, clearance, preload, quiet running |
|
CN |
Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
-
H = Reduced clearance range corresponding to the upper half of the actual clearance range
-
L = Reduced clearance range corresponding to the lower half of the actual clearance range
-
M = Reduced clearance range corresponding to the middle half of the actual clearance range
-
P = Displaced clearance range comprising the upper half of the actual clearance range plus the lower half of the next larger clearance range
The above letters are also used together with the clearance classes C2, C3, C4 and C5, e.g. C2H |
|
C2 |
Radial internal clearance smaller than Normal |
|
C3 |
Radial internal clearance greater than Normal |
|
C4 |
Radial internal clearance greater than C3 |
|
C5 |
Radial internal clearance greater than C4 |
|
6.3 |
Suffixes - Bearing sets, matched bearings |
|
DR |
Set of two matched bearings |
|
TR |
Set of three matched bearings |
|
QR |
Set of four matched bearings |
|
6.4 |
Suffixes - Stabilization |
|
S1 |
Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F) |
|
S2 |
Bearing rings heat stabilized for operating temperatures ≤ 250 °C (480 °F) |
|
6.5 |
Suffixes - Lubrication |
|
W20 |
Lubrication holes in the outer ring |
|
W33(X) |
Annular groove and lubrication holes in the outer ring |
oterh articles about SKF roller bearings
