BEARINGDEXDeep groove ball
6218 bearing
90 mm bore, 160 mm outside diameter, 30 mm width (3.5433 × 6.2992 × 1.1811 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 90 | 3.5433 |
| Outside diameter D | 160 | 6.2992 |
| Width B | 30 | 1.1811 |
Quick numbers
| Pitch diameter dm | 125.0 mm |
| Section height (D − d)/2 | 35.0 mm |
| n·dm at 1,800 rpm | 225,000 |
| n·dm at 3,600 rpm | 450,000 |
Compare against the maker's limiting speed. Speed calculator · L10 life
What the number means
6Deep groove ball
2Diameter series 2: light. Width series 0 is implied and left off.
18Bore code 18 × 5 = 90 mm
How each brand writes it
Same bearing, every maker's notation| Version | SKF | FAG | NSK | NTN | Koyo | NACHI |
|---|---|---|---|---|---|---|
| Open | 6218 | 6218 | 6218 | 6218 | 6218 | 6218 |
| Shields both sides | 6218-2Z | 6218-2ZR | 6218ZZ | 6218ZZ | 6218ZZ | 6218ZZE |
| Contact seals both sides | 6218-2RSH | 6218-2RSR | 6218DDU | 6218LLU | 6218-2RS | 6218-2NSE |
| Contact seals both sides, C3 | 6218-2RSH/C3 | 6218-2RSR-C3 | 6218DDUC3 | 6218LLUC3 | 6218-2RSC3 | 6218-2NSE C3 Verify |
| Non-contact seals both sides | 6218-2RSL | 6218-2BRS Verify | 6218VV | 6218LLB | 6218-2RU Verify | 6218-2NKE Verify |
| Shields both sides, C3 | 6218-2Z/C3 | 6218-2ZR-C3 | 6218ZZC3 | 6218ZZC3 | 6218ZZC3 | 6218ZZE C3 Verify |
Same size, different bearing
These share the 90 × 160 × 30 mm envelope but carry load differently. They aren't drop-in swaps.