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| Parameter | NSKNF238M190 × 340 × 55 mm | KOYONF238190 × 340 × 55 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | NSK | KOYO |
| Designation | NF238M | NF238 |
| Product family | Cylindrical roller bearing | Single-row / NF |
| Detailed type | Cylindrical roller bearings | Cylindrical roller bearings |
| Bore diameterd | 190 mm | 190 mm |
| Outside diameterD | 340 mm | 340 mm |
| WidthB | 55 mm | 55 mm |
| Basic dynamic load ratingC | 685 kN | 694 kN |
| Basic static load ratingC0 | 770 kN | 768 kN |
| Fatigue load limitPu | — | 91.3 kN |
| Limiting speednG | — | 1700 r/min |
| Mass≈m | — | 23.4 kg |
| Cage | Machined brass | — |
| Boundary dimensions | ||
| Bearing widthB | 55 mm | — |
| Minimum bearing chamferr min. | 4 mm | — |
| Minimum secondary bearing chamferr1 min. | 4 mm | — |
| Roller circumscribed circle diameterEw | 299 mm | — |
| Catalogue reference mass | ||
| Approximate shared-row mass — not separately stated for each rib arrangement | 22 kg | — |
| Classification | ||
| Official Category Path | — | Cylindrical roller bearings - Single-row - NF |
| Official Classification 1 | — | Cylindrical roller bearings / Single-row / NF |
| Construction | ||
| Single-row construction type | NF | — |
| Rib arrangement | Two inner-ring ribs; one outer-ring rib | — |
| Standard cage material | Machined brass | — |
| Standard cage marking | M | — |
| Other cage codes listed for this catalogue row | None listed in this row | — |
| Precision — designation omission rule | ISO Normal when no precision suffix is specified | — |
| Clearance identification — verify interchangeability | No clearance suffix shown. CN omission applies to interchangeable designs; do not infer a numerical clearance. | — |
| Optimized crowning note | No optimized-crowning asterisk on this row | — |
| Load ratings — standard cage | ||
| Basic dynamic radial load ratingCr | 685000 N | — |
| Basic static radial load ratingC0r | 770000 N | — |
| Lubrication-qualified speed — standard cage | ||
| Thermal speed rating — oil bath | 2200 r/min | — |
| Mechanical limiting speed — forced oil circulation | Not stated in this catalogue row | — |
| Limiting speed — grease | 1800 r/min | — |
| Limiting speed — oil bath | 2200 r/min | — |
| Manufacturer Identity | ||
| Official Class Key | — | 040-010-000 |
| Mounting dimensions — shown arrangement | ||
| Minimum shaft shoulder diameterda min. | 206 mm | — |
| Maximum housing shoulder diameterDb max. | 324 mm | — |
| Minimum housing shoulder diameterDb min. | 305 mm | — |
| Maximum adjacent fillet radiusra max. | 3 mm | — |
| Maximum secondary adjacent fillet radiusrb max. | 3 mm | — |
| Technical Data | ||
| d | — | 340 mm |
| B | — | 55 mm |
| R(Min.) | — | 4 mm |
| R1(Min.) | — | 4 mm |
| Fw | — | - mm |
| Ew | — | 299 mm |
| Basic Load Ratings : Cr | — | 694 kN |
| Basic Load Ratings : C0R | — | 768 kN |
| Fatigue Load Limit : Cu | — | 91.3 kN |
| Limiting Speeds(Grease Lub.) | — | 1700 min-1 |
| Limiting Speeds(Oil Lub.) | — | 2000 min-1 |
| Sd1 | — | - mm |
| B1 | — | - mm |
| B2 | — | - mm |
| Da(Min.) | — | 206 mm |
| Db(Min.) | — | 310 mm |
| Db(Max.) | — | 324 mm |
| Dc(Min.) | — | - mm |
| Dd(Min.) | — | - mm |
| Da(Max.) | — | - mm |
| Ra(Max.) | — | 3 mm |
| Rb(Max.) | — | 3 mm |
| Mass(Refer.) | — | 23.4 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.