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.
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.
Designation candidates
“5203” across 2 loaded brands
One highest-ranked designation candidate is shown per manufacturer. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| Parameter | NSK520317 × 40 × 17.5 mm | KOYO520317 × 40 × 17.5 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | NSK | KOYO |
| Designation | 5203 | 5203 |
| Product family | Angular contact ball bearing | Double-row / Open |
| Detailed type | Angular contact ball bearings | Angular contact ball bearings |
| Bore diameterd | 17 mm | 17 mm |
| Outside diameterD | 40 mm | 40 mm |
| WidthB | 17.5 mm | 17.5 mm |
| Basic dynamic load ratingC | 16.1 kN | 16.5 kN |
| Basic static load ratingC0 | 9.05 kN | 8.15 kN |
| Fatigue load limitPu | — | 0.42 kN |
| Limiting speednG | — | 11000 r/min |
| Mass≈m | 0.1 kg | 0.091 kg |
| Sealing | Open | Open |
| Cage | Pressed steel | — |
| Boundary dimensions | ||
| Individual bearing widthB | 17.5 mm | — |
| Minimum bearing chamferr min. | 0.6 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 | 16100 N | — |
| Basic static radial load ratingC0r | 9050 N | — |
| Load-centre geometry | ||
| Load-centre spacinga0 | 20.8 mm | — |
| Lubrication-qualified speed | ||
| Limiting speed — grease | 11000 r/min | — |
| Limiting speed — oil | 15000 r/min | — |
| Manufacturer Identity | ||
| Official Class Key | — | 020-030-000 |
| Mass reference | ||
| Approximate mass | 0.1 kg | — |
| Mounting dimensions — shown arrangement | ||
| Minimum shaft shoulder diameterda min. | 22 mm | — |
| Maximum housing shoulder diameterDa max. | 35 mm | — |
| Maximum adjacent fillet radiusra max. | 0.6 mm | — |
| Technical Data | ||
| d | — | 40 mm |
| B | — | 17.5 mm |
| R(Min.) | — | 0.6 mm |
| Basic Load Ratings : Cr | — | 16.5 kN |
| Basic Load Ratings : C0R | — | 8.15 kN |
| Fatigue Load Limit : Cu | — | 0.420 kN |
| Limiting Speeds(Grease Lub.) | — | 11000 min-1 |
| Limiting Speeds(Oil Lub.) | — | 14000 min-1 |
| Load Center Spread : A | — | 20.0 mm |
| Da(Min.) | — | 22 mm |
| Da(Max.) | — | 35.5 mm |
| Ra(Max.) | — | 0.6 mm |
| Mass(Refer.) | — | 0.091 kg |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.