Cross-brand designation analysis
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Same-model Comparison
Explore products that share a base designation across loaded brands, with dimensional agreement and data gaps shown clearly.
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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.
Dimensions verified
“51128” across 3 loaded brands
At least two brands share the same bore, outside diameter and width. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| Parameter | FAG51128140 × 180 × 31 mm | NSK51128X140 × 180 × 31 mm | KOYO51128140 × 180 × 31 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | FAG | NSK | KOYO |
| Designation | 51128 | 51128X | 51128 |
| 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 | 140 mm | 140 mm | 140 mm |
| Outside diameterD | 180 mm | 180 mm | 180 mm |
| WidthB | 31 mm | 31 mm | 31 mm |
| Fatigue load limitPu | — | — | 13.5 kN |
| Reference speednref | 2330 r/min | — | — |
| Limiting speednG | 2750 r/min | — | 1200 r/min |
| Mass≈m | 1.852 kg | 1.83 kg | 2.02 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 | — | 140 mm | — |
| Overall outside diameterD | — | 180 mm | — |
| Complete assembled heightT | — | 31 mm | — |
| Axial load ratings | |||
| Basic dynamic axial load ratingCa | — | 107000 N | — |
| Basic static axial load ratingC0a | — | 375000 N | — |
| Calculation factors | |||
| Minimum load factorA | 0.83 | — | — |
| 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 | — | 178 mm | — |
| Housing washer bore diameterD1 | — | 142 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 | 142 mm | — | — |
| Inner diameter housing washerD1 | 5.591 in | — | — |
| Outer diameter shaft washerd1 | 178 mm | — | — |
| Outer diameter shaft washerd1 | 7.008 in | — | — |
| Lubrication-qualified speed | |||
| Limiting speed — grease | — | 1300 r/min | — |
| Limiting speed — oil | — | 2000 r/min | — |
| Main Dimensions & Performance Data | |||
| Inner diameter shaft washerd | 140 mm | — | — |
| Inner diameter shaft washerd | 5.512 in | — | — |
| Outer diameter housing washerD | 180 mm | — | — |
| Outer diameter housing washerD | 7.087 in | — | — |
| Basic dynamic load rating, axialCa | 111,000 N | — | — |
| Basic dynamic load rating, axialCa | 24,955.036 lbf | — | — |
| Basic static load rating, axialC0a | 400,000 N | — | — |
| Basic static load rating, axialC0a | 89,928.058 lbf | — | — |
| Fatigue load limit, axialCua | 14,600 N | — | — |
| Fatigue load limit, axialCua | 3,282.374 lbf | — | — |
| Manufacturer Identity | |||
| Schaeffler Product Code | 394446 | — | — |
| Official Class Key | — | — | 070-010-000 |
| Base Type | 51128 | — | — |
| Gpsd Group | S02 | — | — |
| Product Line Id | 14 | — | — |
| X Life Marking | n.r. | — | — |
| SAP material number | 0167148730000 | — | — |
| Base product | 2305100101 | — | — |
| Bearing X designation | 51128 | — | — |
| Mounting Manager ID | 51128 | — | — |
| Grease application ID | 51128 | — | — |
| Mass reference | |||
| Approximate assembly mass | — | 1.83 kg | — |
| Mounting dimensions | |||
| Minimum shaft abutment diameterda min. | — | 164 mm | — |
| Maximum housing abutment diameterDa max. | — | 156 mm | — |
| Maximum housing-side fillet radiusra max. | — | 1 mm | — |
| Minimum diameter shaft shoulderda min | 164 mm | — | — |
| Minimum diameter shaft shoulderda min | 6.457 in | — | — |
| Maximum diameter of housing shoulderDa max | 156 mm | — | — |
| Maximum diameter of housing shoulderDa max | 6.142 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 511, single direction, steel sheet metal cage | — | — |
| Short Description | Axial deep groove ball bearing | — | — |
| Technical Data | |||
| d | — | — | 180 mm |
| T | — | — | 31 mm |
| R(Min.) | — | — | 1 mm |
| Bore Diameter (D) | 140 mm | — | — |
| Basic Load Ratings Ca | — | — | 133 kN |
| Outside Diameter (D) | 180 mm | — | — |
| Basic Load Ratings C0A | — | — | 375 kN |
| Width (B) | 31 mm | — | — |
| Fatigue Load Limit : Cu | — | — | 13.5 kN |
| Basic Dynamic Load Rating, Axial (Ca) | 111,000 N | — | — |
| Limiting Speeds(Grease Lub.) | — | — | 1200 min-1 |
| Basic Static Load Rating, Axial (C0A) | 400,000 N | — | — |
| Limiting Speeds(Oil Lub.) | — | — | 1900 min-1 |
| Operating Temperature Min. (Tmin) | -30 °C | — | — |
| D1(Max.) | — | — | 178 mm |
| Limiting Speed (Ng) | 2,750 1/min | — | — |
| D1(Min.) | — | — | 142 mm |
| Operating Temperature Max. (Tmax) | 150 °C | — | — |
| D2 | — | — | - mm |
| Reference Speed (Nϑr) | 2,330 1/min | — | — |
| D3 | — | — | - mm |
| Minimum Diameter Shaft Shoulder (Da Min) | 164 mm | — | — |
| A | — | — | - mm |
| Minimum Load Factor (A) | 0.83 | — | — |
| R | — | — | - mm |
| Rip Diameter Shaft Washer (D1) | 178 mm | — | — |
| C | — | — | - mm |
| Bore Diameter Housing Washer (D1) | 142 mm | — | — |
| Da(Min.) | — | — | 164 mm |
| Maximum Diameter Of Housing Shoulder (Da Max) | 156 mm | — | — |
| Da(Max.) | — | — | 156 mm |
| Minimum Chamfer Dimension (Rmin) | 1 mm | — | — |
| Ra(Max.) | — | — | 1 mm |
| Maximum Fillet Radius (Ra Max) | 1 mm | — | — |
| Mass(Refer.) | — | — | 2.02 kg |
| Fatigue Load Limit, Axial (Cua) | 14,600 N | — | — |
| 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 | — | — |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.