BEARINGDEXDeep groove ball, miniature
637 bearing
7 mm bore, 26 mm outside diameter, 9 mm width (0.2756 × 1.0236 × 0.3543 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 7 | 0.2756 |
| Outside diameter D | 26 | 1.0236 |
| Width B | 9 | 0.3543 |
Quick numbers
| Pitch diameter dm | 16.5 mm |
| Section height (D − d)/2 | 9.5 mm |
| n·dm at 1,800 rpm | 29,700 |
| n·dm at 3,600 rpm | 59,400 |
Compare against the maker's limiting speed. Speed calculator · L10 life
What the number means
6Deep groove ball
3Diameter series 3: medium
7Single digit: bore is 7 mm, written directly
How each brand writes it
Same bearing, every maker's notation| Version | SKF | FAG | NSK | NTN | Koyo | NACHI |
|---|---|---|---|---|---|---|
| Open | 637 | 637 | 637 | 637 | 637 | 637 |
| Shields both sides | 637-2Z | 637-2ZR | 637ZZ | 637ZZ | 637ZZ | 637ZZE |
| Contact seals both sides | 637-2RSH | 637-2RSR | 637DDU | 637LLU | 637-2RS | 637-2NSE |
| Contact seals both sides, C3 | 637-2RSH/C3 | 637-2RSR-C3 | 637DDUC3 | 637LLUC3 | 637-2RSC3 | 637-2NSE C3 Verify |
| Non-contact seals both sides | 637-2RSL | 637-2BRS Verify | 637VV | 637LLB | 637-2RU Verify | 637-2NKE Verify |
| Shields both sides, C3 | 637-2Z/C3 | 637-2ZR-C3 | 637ZZC3 | 637ZZC3 | 637ZZC3 | 637ZZE C3 Verify |