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| Parameter | FAG5121155 × 90 × 25 mm | NSK5121155 × 90 × 25 mm | KOYO5121155 × 90 × 25 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | FAG | NSK | KOYO |
| Designation | 51211 | 51211 | 51211 |
| Product family | — | Axial deep groove ball bearing | Single direction / With flat back faces |
| Detailed type | Axial deep groove ball bearings | Axial deep groove ball bearings | Axial deep groove ball bearings |
| Bore diameterd | 55 mm | 55 mm | 55 mm |
| Outside diameterD | 90 mm | 90 mm | 90 mm |
| WidthB | 25 mm | 25 mm | 25 mm |
| Fatigue load limitPu | — | — | 7.2 kN |
| Reference speednref | 5700 r/min | — | — |
| Limiting speednG | 4350 r/min | — | 2100 r/min |
| Mass≈m | 0.557 kg | 0.599 kg | 0.61 kg |
| Precision class | PN — Normal (ISO 492:2023) | — | — |
| Cage | JP — Steel sheet metal | — | — |
| Minimum operating temperatureTmin | -30 °C | — | — |
| Maximum operating temperatureTmax | 150 °C | — | — |
| Assembly boundary dimensions | |||
| Shaft-washer bore diameterd | — | 55 mm | — |
| Overall outside diameterD | — | 90 mm | — |
| Complete assembled heightT | — | 25 mm | — |
| Axial load ratings | |||
| Basic dynamic axial load ratingCa | — | 70000 N | — |
| Basic static axial load ratingC0a | — | 159000 N | — |
| Calculation factors | |||
| Minimum load factorA | 0.11 | — | — |
| Capabilities & suitability | |||
| Axial load capacity in one direction | Yes | — | — |
| Suitable for grease lubrication | Yes | — | — |
| Suitable for oil lubrication | Yes | — | — |
| Unsealed design | Yes | — | — |
| Chamfers | |||
| Minimum housing-side chamferr min. | — | 1 mm | — |
| Classification | |||
| Official Category Path | — | — | Thrust ball bearings - Single direction - With flat back faces |
| Official Classification 1 | — | — | Thrust ball bearings / Single direction / With flat back faces |
| Component dimensions | |||
| Shaft washer outside diameterd1 | — | 90 mm | — |
| Housing washer bore diameterD1 | — | 57 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 | 1 mm | — | — |
| Minimum chamfer dimensionrmin | 0.039 in | — | — |
| Inner diameter housing washerD1 | 57 mm | — | — |
| Inner diameter housing washerD1 | 2.244 in | — | — |
| Outer diameter shaft washerd1 | 90 mm | — | — |
| Outer diameter shaft washerd1 | 3.543 in | — | — |
| Lubrication-qualified speed | |||
| Limiting speed — grease | — | 2200 r/min | — |
| Limiting speed — oil | — | 3200 r/min | — |
| Main Dimensions & Performance Data | |||
| Inner diameter shaft washerd | 55 mm | — | — |
| Inner diameter shaft washerd | 2.165 in | — | — |
| Outer diameter housing washerD | 90 mm | — | — |
| Outer diameter housing washerD | 3.543 in | — | — |
| Basic dynamic load rating, axialCa | 58,000 N | — | — |
| Basic dynamic load rating, axialCa | 13,039.568 lbf | — | — |
| Basic static load rating, axialC0a | 133,000 N | — | — |
| Basic static load rating, axialC0a | 29,901.079 lbf | — | — |
| Fatigue load limit, axialCua | 6,000 N | — | — |
| Fatigue load limit, axialCua | 1,348.921 lbf | — | — |
| Manufacturer Identity | |||
| Schaeffler Product Code | 394544 | — | — |
| Official Class Key | — | — | 070-010-000 |
| Base Type | 51211 | — | — |
| Gpsd Group | S02 | — | — |
| Product Line Id | 14 | — | — |
| SAP material number | 0167150980000 | — | — |
| Base product | 2305100101 | — | — |
| Bearing X designation | 51211 | — | — |
| Mounting Manager ID | 51211 | — | — |
| Grease application ID | 51211 | — | — |
| Mass reference | |||
| Approximate assembly mass | — | 0.599 kg | — |
| Mounting dimensions | |||
| Minimum shaft abutment diameterda min. | — | 76 mm | — |
| Maximum housing abutment diameterDa max. | — | 69 mm | — |
| Maximum housing-side fillet radiusra max. | — | 1 mm | — |
| Minimum diameter shaft shoulderda min | 76 mm | — | — |
| Minimum diameter shaft shoulderda min | 2.992 in | — | — |
| Maximum diameter of housing shoulderDa max | 69 mm | — | — |
| Maximum diameter of housing shoulderDa max | 2.717 in | — | — |
| Maximum filled radiusra max | 1 mm | — | — |
| Maximum filled radiusra max | 0.039 in | — | — |
| Product characteristics | |||
| Tolerance classPN | Normal (ISO 492:2023) | — | — |
| Dimensional / heat stabilizationS0 | Rings dimensional stabilized up to 150° | — | — |
| Product Identity | |||
| Construction | Axial deep groove ball bearing 512, single direction, steel sheet metal cage | — | — |
| Short Description | Axial deep groove ball bearing | — | — |
| Technical Data | |||
| d | — | — | 90 mm |
| T | — | — | 25 mm |
| Bore Diameter (D) | 55 mm | — | — |
| R(Min.) | — | — | 1 mm |
| Outside Diameter (D) | 90 mm | — | — |
| Basic Load Ratings Ca | — | — | 86.7 kN |
| Width (B) | 25 mm | — | — |
| Basic Load Ratings C0A | — | — | 159 kN |
| Basic Dynamic Load Rating, Axial (Ca) | 58,000 N | — | — |
| Fatigue Load Limit : Cu | — | — | 7.2 kN |
| Basic Static Load Rating, Axial (C0A) | 133,000 N | — | — |
| Limiting Speeds(Grease Lub.) | — | — | 2100 min-1 |
| Operating Temperature Min. (Tmin) | -30 °C | — | — |
| Limiting Speeds(Oil Lub.) | — | — | 3200 min-1 |
| Limiting Speed (Ng) | 4,350 1/min | — | — |
| D1(Max.) | — | — | 90 mm |
| Operating Temperature Max. (Tmax) | 150 °C | — | — |
| D1(Min.) | — | — | 57 mm |
| Reference Speed (Nϑr) | 5,700 1/min | — | — |
| D2 | — | — | - mm |
| Minimum Diameter Shaft Shoulder (Da Min) | 76 mm | — | — |
| D3 | — | — | - mm |
| Minimum Load Factor (A) | 0.11 | — | — |
| A | — | — | - mm |
| Rip Diameter Shaft Washer (D1) | 90 mm | — | — |
| R | — | — | - mm |
| Bore Diameter Housing Washer (D1) | 57 mm | — | — |
| C | — | — | - mm |
| Maximum Diameter Of Housing Shoulder (Da Max) | 69 mm | — | — |
| Da(Min.) | — | — | 76 mm |
| Minimum Chamfer Dimension (Rmin) | 1 mm | — | — |
| Da(Max.) | — | — | 69 mm |
| Maximum Fillet Radius (Ra Max) | 1 mm | — | — |
| Ra(Max.) | — | — | 1 mm |
| Fatigue Load Limit, Axial (Cua) | 6,000 N | — | — |
| Mass(Refer.) | — | — | 0.61 kg |
| Temperature range | |||
| Operating temperature min.Tmin | -30 °C | — | — |
| Operating temperature min.Tmin | -22 °F | — | — |
| Operating temperature max.Tmax | 150 °C | — | — |
| Operating temperature max.Tmax | 302 °F | — | — |
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.