Free tool
Bearing number decoder.
Enter a full bearing number to see the type, the standard size behind it and what each prefix and suffix means. Suffix meanings are typical conventions — manufacturers differ, so confirm in the maker's catalogue.
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Reference
Suffixes it knows
Every suffix the decoder recognises. For a fuller explanation see the suffix dictionary.
| Suffix | Typical meaning |
|---|---|
2RS1 | Contact seals both sides (SKF) |
2RSH | Contact seals both sides (SKF) |
2RSR | Contact seals both sides (FAG) |
2RSL | Low-friction seals both sides (SKF) |
2RZ | Non-contact seals both sides |
2RS | Rubber seals both sides |
RS1 | Contact seal one side (SKF) |
RSH | Contact seal one side (SKF) |
RSR | Contact seal one side (FAG) |
RS | Rubber seal one side |
2ZR | Metal shields both sides (FAG) |
ZZ | Metal shields both sides |
2Z | Metal shields both sides |
ZR | Metal shield one side (FAG) |
Z | Metal shield one side |
DDU | Contact seals both sides (NSK) |
VV | Non-contact seals both sides (NSK) |
LLU | Contact seals both sides (NTN) |
LLB | Non-contact seals both sides (NTN) |
LLH | Low-torque seals both sides (NTN) |
DU | Contact seal one side (NSK) |
LU | Contact seal one side (NTN) |
NR | Snap-ring groove with snap ring |
N | Snap-ring groove in outer ring |
C2 | Clearance smaller than normal |
CN | Normal clearance |
C3 | Clearance greater than normal |
C4 | Clearance greater than C3 |
C5 | Clearance greater than C4 |
K30 | Tapered bore 1:30 |
K | Tapered bore 1:12 |
W33 | Lubrication groove and holes in outer ring |
ECP | Reinforced design, polyamide cage (SKF) |
ECJ | Reinforced design, steel cage (SKF) |
ECM | Reinforced design, brass cage (SKF) |
EC | Reinforced internal design |
CAK | Design CA with tapered bore |
CA | Spherical roller design CA (machined cage) |
CC | Spherical roller design CC (steel cages) |
BEP | 40° contact angle, polyamide cage (SKF) |
BECBM | 40° contact angle, universal matching, brass cage (SKF) |
BE | 40° contact angle (SKF) |
AC | 25° contact angle |
TVP2 | Polyamide cage |
TVP | Polyamide cage |
TVH | Polyamide cage (FAG) |
TV | Polyamide cage (FAG) |
TN9 | Polyamide cage (SKF) |
TN | Polyamide cage |
MA | Brass cage, outer-ring guided |
MB | Brass cage, inner-ring guided |
M | Machined brass cage |
J2 | Pressed steel cage (SKF tapered) |
J | Pressed steel cage |
Q | Optimised contact geometry (SKF tapered) |
P6 | Precision class P6 |
P5 | Precision class P5 |
P4 | Precision class P4 |
HT | High-temperature grease |
E | Reinforced / improved internal design |
B | 40° contact angle (angular contact) |
A | Internal design variant (maker-specific) |
X | ISO-compliant boundary dimensions (tapered) |
Does the decoder look anything up online?
No. It runs in your browser against our standard-size reference and suffix list.
Why is my number not recognised?
The reference covers standard metric designations (deep groove, miniature, self-aligning, angular contact, cylindrical, spherical, tapered, thrust, UCP units). Inch tapered sets (e.g. LM11949), needle bearings and maker-specific numbers are not covered yet.
Are suffix meanings the same for every brand?
Often not. 2RS1 and 2RSH are SKF seals, 2RSR is FAG, DDU is NSK, LLU is NTN. The decoder shows typical meanings; the manufacturer catalogue is the authority.
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