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| Parameter | SKFNJ 256 MA280 × 500 × 80 mm | NSKNJ256M280 × 500 × 80 mm | KOYONJ256280 × 500 × 80 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | SKF | NSK | KOYO |
| Designation | NJ 256 MA | NJ256M | NJ256 |
| Product family | Cylindrical roller bearings | Cylindrical roller bearing | Single-row / NJ |
| Detailed type | Single row cylindrical roller bearing, nj design | Cylindrical roller bearings | Cylindrical roller bearings |
| Bore diameterd | 280 mm | 280 mm | 280 mm |
| Outside diameterD | 500 mm | 500 mm | 500 mm |
| WidthB | 80 mm | 80 mm | 80 mm |
| Basic dynamic load ratingC | 1140 kN | 1410 kN | 1430 kN |
| Basic static load ratingC0 | 1800 kN | 1680 kN | 1680 kN |
| Fatigue load limitPu | 156 kN | — | 179 kN |
| Reference speednref | 1400 r/min | — | — |
| Limiting speednG | 1900 r/min | — | 1000 r/min |
| Mass≈m | 73 kg | — | 74.4 kg |
| Internal clearance | CN | — | — |
| Sealing | Without | — | — |
| Cage | Machined brass | Machined brass | — |
| Lubricant | None | — | — |
| Boundary dimensions | |||
| Bearing widthB | — | 80 mm | — |
| Minimum bearing chamferr min. | — | 5 mm | — |
| Minimum secondary bearing chamferr1 min. | — | 5 mm | — |
| Roller inscribed circle diameterFw | — | 340 mm | — |
| Catalogue reference mass | |||
| Approximate shared-row mass — not separately stated for each rib arrangement | — | 70.7 kg | — |
| Classification | |||
| Official Category Path | — | — | Cylindrical roller bearings - Single-row - NJ |
| Official Classification 1 | — | — | Cylindrical roller bearings / Single-row / NJ |
| Construction | |||
| Single-row construction type | — | NJ | — |
| Rib arrangement | — | Two outer-ring ribs; one inner-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 | — |
| Engineering — Abutment dimensions | |||
| Diameter of spacer sleeved a | max. 333 mm | — | — |
| Diameter of shaft abutmentd b | min. 364 mm | — | — |
| Diameter of housing abutmentD a | max. 480 mm | — | — |
| Radius of filletr a | max. 4 mm | — | — |
| Engineering — Calculation data | |||
| Minimum load factork r | 0.15 | — | — |
| Limiting valuee | 0.2 | — | — |
| Calculation factorY | 0.6 | — | — |
| Engineering — Dimensions | |||
| Shoulder diameter of inner ringd 1 | ≈ 360 mm | — | — |
| Shoulder diameter of outer ringD 1 | ≈ 417 mm | — | — |
| Raceway diameter of inner ringF | 340 mm | — | — |
| Chamfer dimensionr 1,2 | min. 5 mm | — | — |
| Permissible axial displacements | max. 3.8 mm | — | — |
| Load ratings — standard cage | |||
| Basic dynamic radial load ratingCr | — | 1410000 N | — |
| Basic static radial load ratingC0r | — | 1680000 N | — |
| Logistics | |||
| Product net weight | 73.0 kg | — | — |
| eClass code | 23-05-09-01 | — | — |
| UNSPSC code | 31171505 | — | — |
| Lubrication-qualified speed — standard cage | |||
| Thermal speed rating — oil bath | — | 1300 r/min | — |
| Mechanical limiting speed — forced oil circulation | — | Not stated in this catalogue row | — |
| Limiting speed — grease | — | 1100 r/min | — |
| Limiting speed — oil bath | — | 1400 r/min | — |
| Manufacturer Identity | |||
| Official Class Key | — | — | 040-010-000 |
| Mounting dimensions — shown arrangement | |||
| Minimum shaft shoulder diameterdb min. | — | 300 mm | — |
| Maximum housing shoulder diameterDa max. | — | 480 mm | — |
| Maximum adjusting-ring diameter (NU/NJ arrangement)db max. | — | 334 mm | — |
| Maximum adjacent fillet radiusra max. | — | 4 mm | — |
| Maximum secondary adjacent fillet radiusrb max. | — | 4 mm | — |
| Product identity | |||
| Official product category | Cylindrical roller bearings | — | — |
| Official taxonomy path | /products/rolling-bearings/roller-bearings/cylindrical-roller-bearings/single-row-cylindrical-roller-bearings | — | — |
| Structure group ID | BC1_001_101 | — | — |
| Available from SKF | Yes | — | — |
| Remanufacturable | Yes | — | — |
| Properties | |||
| Bearing part | Complete bearing | — | — |
| Axial displacement capability | In one direction | — | — |
| Number of rows | 1 | — | — |
| Locating feature, bearing outer ring | Without | — | — |
| Bore type | Cylindrical | — | — |
| Number of flanges, outer ring | 2 | — | — |
| Number of flanges, inner ring | 1 | — | — |
| Loose flange | None | — | — |
| Radial internal clearance | CN | — | — |
| Tolerance class | Normal | — | — |
| Coating | Without | — | — |
| Relubrication feature | Without | — | — |
| Candidate for remanufacturing | Yes | — | — |
| Indicative carbon footprint for new product | 270.0 kg CO 2 e | — | — |
| Indicative carbon footprint for remanufactured product | 89.8 kg CO 2 e | — | — |
| Technical Data | |||
| d | — | — | 500 mm |
| B | — | — | 80 mm |
| R(Min.) | — | — | 5 mm |
| R1(Min.) | — | — | 5 mm |
| Fw | — | — | 340 mm |
| Ew | — | — | - mm |
| Basic Load Ratings : Cr | — | — | 1430 kN |
| Basic Load Ratings : C0R | — | — | 1680 kN |
| Fatigue Load Limit : Cu | — | — | 179 kN |
| Limiting Speeds(Grease Lub.) | — | — | 1000 min-1 |
| Limiting Speeds(Oil Lub.) | — | — | 1200 min-1 |
| Sd1 | — | — | - mm |
| B1 | — | — | - mm |
| B2 | — | — | - mm |
| Da(Min.) | — | — | - mm |
| Db(Min.) | — | — | - mm |
| Db(Max.) | — | — | - mm |
| Dc(Min.) | — | — | - mm |
| Dd(Min.) | — | — | - mm |
| Da(Max.) | — | — | 480 mm |
| Ra(Max.) | — | — | 4 mm |
| Rb(Max.) | — | — | 4 mm |
| Mass(Refer.) | — | — | 74.4 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.