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| Parameter | NSK6944220 × 300 × 38 mm | KOYO6944220 × 300 × 38 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | NSK | KOYO |
| Designation | 6944 | 6944 |
| Product family | Single row deep groove ball bearings | Single-row / Open type |
| Detailed type | Deep groove ball bearings | Deep groove ball bearings |
| Bore diameterd | 220 mm | 220 mm |
| Outside diameterD | 300 mm | 300 mm |
| WidthB | 38 mm | 38 mm |
| Basic dynamic load ratingC | 161 kN | 201 kN |
| Basic static load ratingC0 | 169 kN | 180 kN |
| Fatigue load limitPu | — | 5.85 kN |
| Limiting speednG | — | 1900 r/min |
| Mass≈m | 7.88 kg | 7.9 kg |
| Sealing | Open | Open |
| Boundary dimensions | ||
| Bearing widthB | 38 mm | — |
| Minimum bearing chamferr min. | 2.1 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 | 161000 N | — |
| Basic static radial load ratingC0r | 169000 N | — |
| Equivalent-load calculation factorf0 | 16.6 | — |
| Lubrication-qualified speed | ||
| Limiting speed with grease | 1800 r/min | — |
| Limiting speed with oil (open bearing) | 2200 r/min | — |
| Manufacturer Identity | ||
| Official Class Key | — | 010-010-010 |
| Mounting dimensions | ||
| Minimum shaft shoulder diameterda min. | 231 mm | — |
| Maximum shaft shoulder diameterda max. | 242 mm | — |
| Maximum housing shoulder diameterDa max. | 289 mm | — |
| Maximum shaft or housing fillet radiusra max. | 2 mm | — |
| Reference mass | ||
| Approximate catalogue mass (open reference) | 7.88 kg | — |
| Technical Data | ||
| d | — | 300 mm |
| B | — | 38 mm |
| R(Min.) | — | 2.1 mm |
| Basic Load Ratings : Cr | — | 201 kN |
| Basic Load Ratings : C0R | — | 180 kN |
| Fatigue Load Limit : Cu | — | 5.85 kN |
| Factor : F0 | — | 16.4 |
| Limiting Speeds(Grease Lub.) | — | 1900 min-1 |
| Limiting Speeds(Oil Lub.) | — | 2200 min-1 |
| Da(Min.) | — | 231 mm |
| Da(Max.) | — | 289 mm |
| Ra(Max.) | — | 2 mm |
| Mass(Refer.) | — | 7.90 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.