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| Parameter | NSK681890 × 115 × 13 mm | KOYO681890 × 115 × 13 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | NSK | KOYO |
| Designation | 6818 | 6818 |
| Product family | Single row deep groove ball bearings | Single-row / Open type |
| Detailed type | Deep groove ball bearings | Deep groove ball bearings |
| Bore diameterd | 90 mm | 90 mm |
| Outside diameterD | 115 mm | 115 mm |
| WidthB | 13 mm | 13 mm |
| Basic dynamic load ratingC | 20.9 kN | 23.8 kN |
| Basic static load ratingC0 | 21 kN | 19.7 kN |
| Fatigue load limitPu | — | 1 kN |
| Limiting speednG | — | 5300 r/min |
| Mass≈m | 0.276 kg | 0.279 kg |
| Sealing | Open | Open |
| Boundary dimensions | ||
| Bearing widthB | 13 mm | — |
| Minimum bearing chamferr min. | 1 mm | — |
| Classification | ||
| Official Category Path | — | Deep groove ball bearings - Single-row - Open type |
| Official Classification 1 | — | Deep groove ball bearings / Single-row / Open type |
| Construction | ||
| Catalogue closure construction | Open | — |
| Load ratings | ||
| Basic dynamic radial load ratingCr | 20900 N | — |
| Basic static radial load ratingC0r | 21000 N | — |
| Equivalent-load calculation factorf0 | 17.2 | — |
| Lubrication-qualified speed | ||
| Limiting speed with grease | 5300 r/min | — |
| Limiting speed with oil (open bearing) | 6300 r/min | — |
| Manufacturer Identity | ||
| Official Class Key | — | 010-010-010 |
| Mounting dimensions | ||
| Minimum shaft shoulder diameterda min. | 95 mm | — |
| Maximum shaft shoulder diameterda max. | 95.5 mm | — |
| Maximum housing shoulder diameterDa max. | 110 mm | — |
| Maximum shaft or housing fillet radiusra max. | 1 mm | — |
| Reference mass | ||
| Approximate catalogue mass (open reference) | 0.276 kg | — |
| Technical Data | ||
| d | — | 115 mm |
| B | — | 13 mm |
| R(Min.) | — | 1 mm |
| Basic Load Ratings : Cr | — | 23.8 kN |
| Basic Load Ratings : C0R | — | 19.7 kN |
| Fatigue Load Limit : Cu | — | 1.00 kN |
| Factor : F0 | — | 16.1 |
| Limiting Speeds(Grease Lub.) | — | 5300 min-1 |
| Limiting Speeds(Oil Lub.) | — | 6300 min-1 |
| Da(Min.) | — | 95 mm |
| Da(Max.) | — | 110 mm |
| Ra(Max.) | — | 1 mm |
| Mass(Refer.) | — | 0.279 kg |
Independent reference comparison based on the manufacturer data currently loaded. Always verify current limits, tolerances and suffix definitions with the official source before engineering selection.