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.
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.
Dimensions verified
“51209” 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 | FAG5120945 × 73 × 20 mm | NSK5120945 × 73 × 20 mm | KOYO5120945 × 73 × 20 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | FAG | NSK | KOYO |
| Designation | 51209 | 51209 | 51209 |
| 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 | 45 mm | 45 mm | 45 mm |
| Outside diameterD | 73 mm | 73 mm | 73 mm |
| WidthB | 20 mm | 20 mm | 20 mm |
| Fatigue load limitPu | — | — | 4.75 kN |
| Reference speednref | 6600 r/min | — | — |
| Limiting speednG | 5500 r/min | — | 2600 r/min |
| Mass≈m | 0.32 kg | 0.31 kg | 0.32 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 | — | 45 mm | — |
| Overall outside diameterD | — | 73 mm | — |
| Complete assembled heightT | — | 20 mm | — |
| Axial load ratings | |||
| Basic dynamic axial load ratingCa | — | 48000 N | — |
| Basic static axial load ratingC0a | — | 105000 N | — |
| Calculation factors | |||
| Minimum load factorA | 0.043 | — | — |
| 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 | — | 73 mm | — |
| Housing washer bore diameterD1 | — | 47 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 | 47 mm | — | — |
| Inner diameter housing washerD1 | 1.85 in | — | — |
| Outer diameter shaft washerd1 | 73 mm | — | — |
| Outer diameter shaft washerd1 | 2.874 in | — | — |
| Lubrication-qualified speed | |||
| Limiting speed — grease | — | 2600 r/min | — |
| Limiting speed — oil | — | 4000 r/min | — |
| Main Dimensions & Performance Data | |||
| Inner diameter shaft washerd | 45 mm | — | — |
| Inner diameter shaft washerd | 1.772 in | — | — |
| Outer diameter housing washerD | 73 mm | — | — |
| Outer diameter housing washerD | 2.874 in | — | — |
| Basic dynamic load rating, axialCa | 39,000 N | — | — |
| Basic dynamic load rating, axialCa | 8,767.986 lbf | — | — |
| Basic static load rating, axialC0a | 80,000 N | — | — |
| Basic static load rating, axialC0a | 17,985.612 lbf | — | — |
| Fatigue load limit, axialCua | 3,650 N | — | — |
| Fatigue load limit, axialCua | 820.594 lbf | — | — |
| Manufacturer Identity | |||
| Schaeffler Product Code | 394540 | — | — |
| Official Class Key | — | — | 070-010-000 |
| Base Type | 51209 | — | — |
| Gpsd Group | S02 | — | — |
| Product Line Id | 14 | — | — |
| X Life Marking | n.r. | — | — |
| SAP material number | 0167150710000 | — | — |
| Base product | 2305100101 | — | — |
| Bearing X designation | 51209 | — | — |
| Mounting Manager ID | 51209 | — | — |
| Grease application ID | 51209 | — | — |
| Mass reference | |||
| Approximate assembly mass | — | 0.31 kg | — |
| Mounting dimensions | |||
| Minimum shaft abutment diameterda min. | — | 62 mm | — |
| Maximum housing abutment diameterDa max. | — | 56 mm | — |
| Maximum housing-side fillet radiusra max. | — | 1 mm | — |
| Minimum diameter shaft shoulderda min | 62 mm | — | — |
| Minimum diameter shaft shoulderda min | 2.441 in | — | — |
| Maximum diameter of housing shoulderDa max | 56 mm | — | — |
| Maximum diameter of housing shoulderDa max | 2.205 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 | — | — | 73 mm |
| T | — | — | 20 mm |
| R(Min.) | — | — | 1 mm |
| Bore Diameter (D) | 45 mm | — | — |
| Basic Load Ratings Ca | — | — | 59.7 kN |
| Outside Diameter (D) | 73 mm | — | — |
| Basic Load Ratings C0A | — | — | 105 kN |
| Width (B) | 20 mm | — | — |
| Fatigue Load Limit : Cu | — | — | 4.75 kN |
| Basic Dynamic Load Rating, Axial (Ca) | 39,000 N | — | — |
| Limiting Speeds(Grease Lub.) | — | — | 2600 min-1 |
| Basic Static Load Rating, Axial (C0A) | 80,000 N | — | — |
| Limiting Speeds(Oil Lub.) | — | — | 4000 min-1 |
| Operating Temperature Min. (Tmin) | -30 °C | — | — |
| D1(Max.) | — | — | 73 mm |
| Limiting Speed (Ng) | 5,500 1/min | — | — |
| D1(Min.) | — | — | 47 mm |
| Operating Temperature Max. (Tmax) | 150 °C | — | — |
| D2 | — | — | - mm |
| Reference Speed (Nϑr) | 6,600 1/min | — | — |
| D3 | — | — | - mm |
| Minimum Diameter Shaft Shoulder (Da Min) | 62 mm | — | — |
| A | — | — | - mm |
| Minimum Load Factor (A) | 0.043 | — | — |
| R | — | — | - mm |
| Rip Diameter Shaft Washer (D1) | 73 mm | — | — |
| C | — | — | - mm |
| Bore Diameter Housing Washer (D1) | 47 mm | — | — |
| Da(Min.) | — | — | 62 mm |
| Maximum Diameter Of Housing Shoulder (Da Max) | 56 mm | — | — |
| Da(Max.) | — | — | 56 mm |
| Minimum Chamfer Dimension (Rmin) | 1 mm | — | — |
| Ra(Max.) | — | — | 1 mm |
| Maximum Fillet Radius (Ra Max) | 1 mm | — | — |
| Mass(Refer.) | — | — | 0.32 kg |
| Fatigue Load Limit, Axial (Cua) | 3,650 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.