Cross-brand designation analysis
COMPARE / VERIFY
Same-model Comparison
Explore products that share a base designation across loaded brands, with dimensional agreement and data gaps shown clearly.
Cross Reference centre · Interchange verification checklist · Understand suffix differences
You entered 51256X. This table explores the base group 51256; it does not preserve or approve every requested suffix. Search your complete marking first →
Automatic candidate selection
One base designation across loaded brands
Exact designations rank first. Dimensions, suffixes and other technical differences remain visible so the result is not mistaken for an interchangeability declaration.
Data incomplete
“51256” across 3 loaded brands
The base designation is shared, but too few brands have complete boundary dimensions. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| Parameter | SKF51256 M280 × 380 × mm | FAG51256-MP280 × 380 × 80 mm | NSK51256X280 × 380 × 80 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | SKF | FAG | NSK |
| Designation | 51256 M | 51256-MP | 51256X |
| Product family | Thrust ball bearings | — | Axial deep groove ball bearing |
| Detailed type | Single direction thrust ball bearing | Axial deep groove ball bearings | Axial deep groove ball bearings |
| Series | — | 51256 | — |
| Bore diameterd | 280 mm | 280 mm | 280 mm |
| Outside diameterD | 380 mm | 380 mm | 380 mm |
| WidthB | — | 80 mm | 80 mm |
| HeightH | 80 mm | — | — |
| Basic dynamic load ratingC | 488 kN | — | — |
| Basic static load ratingC0 | 2320 kN | — | — |
| Fatigue load limitPu | 47.5 kN | — | — |
| Reference speednref | 750 r/min | 1250 r/min | — |
| Limiting speednG | 1000 r/min | 1100 r/min | — |
| Mass≈m | 27.6 kg | 26 kg | 27.1 kg |
| Precision class | — | PN — Normal (ISO 492:2023) | — |
| Cage | Machined brass | MP — Solid brass cage, rolling element guided | — |
| Bearing material | Bearing steel | — | — |
| Minimum operating temperatureTmin | — | -30 °C | — |
| Maximum operating temperatureTmax | — | 200 °C | — |
| Assembly boundary dimensions | |||
| Shaft-washer bore diameterd | — | — | 280 mm |
| Overall outside diameterD | — | — | 380 mm |
| Complete assembled heightT | — | — | 80 mm |
| Axial load ratings | |||
| Basic dynamic axial load ratingCa | — | — | 450000 N |
| Basic static axial load ratingC0a | — | — | 1950000 N |
| Calculation factors | |||
| Minimum load factorA | 28 | 24 | — |
| Capabilities & suitability | |||
| Axial load capacity in one direction | — | Yes | — |
| Suitable for grease lubrication | — | Yes | — |
| Suitable for oil lubrication | — | Yes | — |
| Unsealed design | — | Yes | — |
| Largebearing | — | Yes | — |
| Chamfers | |||
| Minimum housing-side chamferr min. | — | — | 2.1 mm |
| Component dimensions | |||
| Shaft washer outside diameterd1 | — | — | 375 mm |
| Housing washer bore diameterD1 | — | — | 284 mm |
| Construction | |||
| Axial load directions | — | — | One direction |
| Seat construction | — | — | Flat seat |
| Radial-load support | — | — | Not suitable for radial load; separate radial support required |
| Dimensions | |||
| Minimum chamfer dimensionrmin | — | 2.1 mm | — |
| Minimum chamfer dimensionrmin | — | 0.083 in | — |
| Inner diameter housing washerD1 | — | 284 mm | — |
| Inner diameter housing washerD1 | — | 11.181 in | — |
| Outer diameter shaft washerd1 | — | 375 mm | — |
| Outer diameter shaft washerd1 | — | 14.764 in | — |
| Engineering — Abutment dimensions | |||
| Abutment diameter shaftd a | min. 339 mm | — | — |
| Abutment diameter housingD a | max. 321 mm | — | — |
| Fillet radiusr a | max. 2 mm | — | — |
| Engineering — Dimensions | |||
| Outside diameter shaft washerd 1 | ≈ 375 mm | — | — |
| Inner diameter housing washerD 1 | ≈ 284 mm | — | — |
| Chamfer dimension washerr 1,2 | min. 2.1 mm | — | — |
| Logistics | |||
| Product net weight | 27.6 kg | — | — |
| eClass code | 23-05-10-01 | — | — |
| UNSPSC code | 31171507 | — | — |
| Lubrication-qualified speed | |||
| Limiting speed — grease | — | — | 530 r/min |
| Limiting speed — oil | — | — | 800 r/min |
| Main Dimensions & Performance Data | |||
| Inner diameter shaft washerd | — | 280 mm | — |
| Inner diameter shaft washerd | — | 11.024 in | — |
| Outer diameter housing washerD | — | 380 mm | — |
| Outer diameter housing washerD | — | 14.961 in | — |
| Basic dynamic load rating, axialCa | — | 495,000 N | — |
| Basic dynamic load rating, axialCa | — | 111,285.971 lbf | — |
| Basic static load rating, axialC0a | — | 2,150,000 N | — |
| Basic static load rating, axialC0a | — | 483,363.309 lbf | — |
| Fatigue load limit, axialCua | — | 54,000 N | — |
| Fatigue load limit, axialCua | — | 12,140.288 lbf | — |
| Manufacturer Identity | |||
| Schaeffler Product Code | — | 394597 | — |
| Base Type | — | 51256 | — |
| Old Designation | — | ["51256M","51256MP"] | — |
| Gpsd Group | — | S02 | — |
| Product Line Id | — | 14 | — |
| X Life Marking | — | n.r. | — |
| SAP material number | — | 0190624510000 | — |
| Base product | — | 2305100101 | — |
| Bearing X designation | — | 51256-MP | — |
| Mounting Manager ID | — | 51256-MP | — |
| Grease application ID | — | 51256-MP | — |
| Mass reference | |||
| Approximate assembly mass | — | — | 27.1 kg |
| Mounting dimensions | |||
| Minimum shaft abutment diameterda min. | — | — | 339 mm |
| Maximum housing abutment diameterDa max. | — | — | 321 mm |
| Maximum housing-side fillet radiusra max. | — | — | 2 mm |
| Minimum diameter shaft shoulderda min | — | 340 mm | — |
| Minimum diameter shaft shoulderda min | — | 13.386 in | — |
| Maximum diameter of housing shoulderDa max | — | 320 mm | — |
| Maximum diameter of housing shoulderDa max | — | 12.598 in | — |
| Maximum filled radiusra max | — | 2.1 mm | — |
| Maximum filled radiusra max | — | 0.083 in | — |
| Product characteristics | |||
| Tolerance classPN | — | Normal (ISO 492:2023) | — |
| Dimensional / heat stabilizationS1 | — | Rings dimensional stabilized up to 200° | — |
| Product identity | |||
| Official product category | Thrust ball bearings | — | — |
| Official taxonomy path | /products/rolling-bearings/ball-bearings/thrust-ball-bearings | — | — |
| Structure group ID | BD1_001_BDC_001 | — | — |
| Available from SKF | Yes | — | — |
| Remanufacturable | No | — | — |
| Product Identity | |||
| Construction | — | Axial deep groove ball bearing 512..-MP, single direction, solid brass cage | — |
| Short Description | — | Axial deep groove ball bearing | — |
| Properties | |||
| Axial load capability | Single-direction | — | — |
| Number of rows | 1 | — | — |
| Housing washer type | Flat | — | — |
| Tolerance class | Normal | — | — |
| Material, bearing | Bearing steel | — | — |
| Coating | Without | — | — |
| Indicative carbon footprint for new product | 102.0 kg CO 2 e | — | — |
| Technical Data | |||
| Bore Diameter (D) | — | 280 mm | — |
| Outside Diameter (D) | — | 380 mm | — |
| Width (B) | — | 80 mm | — |
| Basic Dynamic Load Rating, Axial (Ca) | — | 495,000 N | — |
| Basic Static Load Rating, Axial (C0A) | — | 2,150,000 N | — |
| Operating Temperature Min. (Tmin) | — | -30 °C | — |
| Limiting Speed (Ng) | — | 1,100 1/min | — |
| Operating Temperature Max. (Tmax) | — | 200 °C | — |
| Reference Speed (Nϑr) | — | 1,250 1/min | — |
| Minimum Diameter Shaft Shoulder (Da Min) | — | 340 mm | — |
| Minimum Load Factor (A) | — | 24 | — |
| Rip Diameter Shaft Washer (D1) | — | 375 mm | — |
| Bore Diameter Housing Washer (D1) | — | 284 mm | — |
| Maximum Diameter Of Housing Shoulder (Da Max) | — | 320 mm | — |
| Minimum Chamfer Dimension (Rmin) | — | 2.1 mm | — |
| Maximum Fillet Radius (Ra Max) | — | 2.1 mm | — |
| Fatigue Load Limit, Axial (Cua) | — | 54,000 N | — |
| Temperature range | |||
| Operating temperature min.Tmin | — | -30 °C | — |
| Operating temperature min.Tmin | — | -22 °F | — |
| Operating temperature max.Tmax | — | 200 °C | — |
| Operating temperature max.Tmax | — | 392 °F | — |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.