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| Parameter | NSK520420 × 47 × 20.6 mm | KOYO520420 × 47 × 20.6 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | NSK | KOYO |
| Designation | 5204 | 5204 |
| Product family | Angular contact ball bearing | Double-row / Open |
| Detailed type | Angular contact ball bearings | Angular contact ball bearings |
| Bore diameterd | 20 mm | 20 mm |
| Outside diameterD | 47 mm | 47 mm |
| WidthB | 20.6 mm | 20.6 mm |
| Basic dynamic load ratingC | 21.6 kN | 24.6 kN |
| Basic static load ratingC0 | 12.4 kN | 12.5 kN |
| Fatigue load limitPu | — | 0.64 kN |
| Limiting speednG | — | 8800 r/min |
| Mass≈m | 0.16 kg | 0.158 kg |
| Sealing | Open | Open |
| Cage | Pressed steel | — |
| Boundary dimensions | ||
| Individual bearing widthB | 20.6 mm | — |
| Minimum bearing chamferr min. | 1 mm | — |
| Classification | ||
| Official Category Path | — | Angular contact ball bearings - Double-row - Open |
| Official Classification 1 | — | Angular contact ball bearings / Double-row / Open |
| Construction | ||
| Cage material and construction | Pressed steel | — |
| Construction / arrangement | Double-row angular contact bearing | — |
| Load ratings | ||
| Basic dynamic radial load ratingCr | 21600 N | — |
| Basic static radial load ratingC0r | 12400 N | — |
| Load-centre geometry | ||
| Load-centre spacinga0 | 24.3 mm | — |
| Lubrication-qualified speed | ||
| Limiting speed — grease | 10000 r/min | — |
| Limiting speed — oil | 13000 r/min | — |
| Manufacturer Identity | ||
| Official Class Key | — | 020-030-000 |
| Mass reference | ||
| Approximate mass | 0.16 kg | — |
| Mounting dimensions — shown arrangement | ||
| Minimum shaft shoulder diameterda min. | 26 mm | — |
| Maximum housing shoulder diameterDa max. | 41 mm | — |
| Maximum adjacent fillet radiusra max. | 1 mm | — |
| Technical Data | ||
| d | — | 47 mm |
| B | — | 20.6 mm |
| R(Min.) | — | 1 mm |
| Basic Load Ratings : Cr | — | 24.6 kN |
| Basic Load Ratings : C0R | — | 12.5 kN |
| Fatigue Load Limit : Cu | — | 0.640 kN |
| Limiting Speeds(Grease Lub.) | — | 8800 min-1 |
| Limiting Speeds(Oil Lub.) | — | 12000 min-1 |
| Load Center Spread : A | — | 23.5 mm |
| Da(Min.) | — | 26 mm |
| Da(Max.) | — | 41.5 mm |
| Ra(Max.) | — | 1 mm |
| Mass(Refer.) | — | 0.158 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.