BEARINGDEXDeep groove ball
6306 bearing
30 mm bore, 72 mm outside diameter, 19 mm width (1.1811 × 2.8346 × 0.748 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 30 | 1.1811 |
| Outside diameter D | 72 | 2.8346 |
| Width B | 19 | 0.7480 |
Quick numbers
| Pitch diameter dm | 51.0 mm |
| Section height (D − d)/2 | 21.0 mm |
| n·dm at 1,800 rpm | 91,800 |
| n·dm at 3,600 rpm | 183,600 |
Compare against the maker's limiting speed. Speed calculator · L10 life
What the number means
6Deep groove ball
3Diameter series 3: medium. Width series 0 is implied and left off.
06Bore code 06 × 5 = 30 mm
How each brand writes it
Same bearing, every maker's notation| Version | SKF | FAG | NSK | NTN | Koyo | NACHI |
|---|---|---|---|---|---|---|
| Open | 6306 | 6306 | 6306 | 6306 | 6306 | 6306 |
| Shields both sides | 6306-2Z | 6306-2ZR | 6306ZZ | 6306ZZ | 6306ZZ | 6306ZZE |
| Contact seals both sides | 6306-2RSH | 6306-2RSR | 6306DDU | 6306LLU | 6306-2RS | 6306-2NSE |
| Contact seals both sides, C3 | 6306-2RSH/C3 | 6306-2RSR-C3 | 6306DDUC3 | 6306LLUC3 | 6306-2RSC3 | 6306-2NSE C3 Verify |
| Non-contact seals both sides | 6306-2RSL | 6306-2BRS Verify | 6306VV | 6306LLB | 6306-2RU Verify | 6306-2NKE Verify |
| Shields both sides, C3 | 6306-2Z/C3 | 6306-2ZR-C3 | 6306ZZC3 | 6306ZZC3 | 6306ZZC3 | 6306ZZE C3 Verify |
Same size, different bearing
These share the 30 × 72 × 19 mm envelope but carry load differently. They aren't drop-in swaps.