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
“603” across 3 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 | NSK6033 × 9 × 3 mm | KOYO6033 × 9 × 3 mm | EZO6033 × 9 × 3 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | NSK | KOYO | EZO |
| Designation | 603 | 603 | 603 |
| Product family | Single row deep groove ball bearings | Extra-small, miniature ball bearings / Standard type / Open | Miniature Ball Bearing |
| Detailed type | Deep groove ball bearings | Deep groove ball bearings | Deep groove ball bearings |
| Bore diameterd | 3 mm | 3 mm | 3 mm |
| Outside diameterD | 9 mm | 9 mm | 9 mm |
| WidthB | 3 mm | 3 mm | 3 mm |
| Basic dynamic load ratingC | 0.63 kN | 0.54 kN | 0.572 kN |
| Basic static load ratingC0 | 0.187 kN | 0.16 kN | 0.188 kN |
| Fatigue load limitPu | — | 0.004 kN | — |
| Limiting speednG | — | 60000 r/min | — |
| Mass≈m | 0.00087 kg | 0 kg | 0.00085 kg |
| Sealing | Open | Open | Open (no closure suffix in this catalogue marking) |
| Bearing material | — | — | High-carbon chromium bearing steel |
| Boundary dimensions | |||
| Bearing width (open)B | 3 mm | — | — |
| Outer diameterD | — | — | 9 mm |
| Minimum bearing chamferr min. | 0.15 mm | — | — |
| Outer diameterD | — | — | 0.3543 inch |
| Inner ring widthB | — | — | 3 mm |
| Inner ring widthB | — | — | 0.1181 inch |
| Outer ring widthC | — | — | 3 mm |
| Outer ring widthC | — | — | 0.1181 inch |
| Inner ring chamfer dimensionr si min | — | — | 0.15 mm |
| Inner ring chamfer dimensionr si min | — | — | 0.0059 inch |
| Outer ring chamfer dimensionr se min | — | — | 0.15 mm |
| Outer ring chamfer dimensionr se min | — | — | 0.0059 inch |
| Classification | |||
| Official Category Path | — | Deep groove ball bearings - Extra-small, miniature ball bearings - Standard type - Open | — |
| Official Classification 1 | — | Deep groove ball bearings / Extra-small, miniature ball bearings / Standard type / Open | — |
| Construction | |||
| Catalogue closure construction | Open | — | — |
| Closure interpretation | — | — | Open (no closure suffix in this catalogue marking) |
| Material interpretation | — | — | High-carbon chromium bearing steel |
| Load ratings | |||
| Basic dynamic radial load ratingCr | 630 N | — | — |
| Basic static radial load ratingC0r | 187 N | — | — |
| Lubrication-qualified speed | |||
| Limiting speed with grease | 56000 r/min | — | — |
| Limiting speed with oil (open) | 67000 r/min | — | — |
| Catalogue limiting speed (grease) | — | — | 66000 r/min |
| Catalogue limiting speed (oil) | — | — | 78000 r/min |
| Manufacturer Identity | |||
| Official Class Key | — | 010-020-010 | — |
| Mounting dimensions | |||
| Minimum shaft shoulder diameter (open)da min. | 4.2 mm | — | — |
| Maximum adjacent fillet radiusra max. | 0.15 mm | — | — |
| Maximum housing shoulder diameter (open)Da max. | 7.8 mm | — | — |
| Adjacent mounting dimension (da min)da min | — | — | 7.3 mm |
| Adjacent mounting dimension (da min)da min | — | — | 0.2874 inch |
| Adjacent mounting dimension (da max)da max | — | — | 7.8 mm |
| Adjacent mounting dimension (da max)da max | — | — | 0.3071 inch |
| Adjacent mounting dimension (r asi max)r asi max | — | — | 0.15 mm |
| Adjacent mounting dimension (r asi max)r asi max | — | — | 0.0059 inch |
| Adjacent mounting dimension (r ase max)r ase max | — | — | 0.15 mm |
| Adjacent mounting dimension (r ase max)r ase max | — | — | 0.0059 inch |
| Reference mass | |||
| Approximate catalogue mass (open) | 0.87 g | — | — |
| Reference mass | — | — | 0.85 g |
| Rolling elements | |||
| Ball diameterDw | — | — | 1.588 mm |
| Ball quantityZ | — | — | 6 |
| Technical Data | |||
| d | — | 9 mm | — |
| B | — | 3 mm | — |
| R(Min.) | — | 0.15 mm | — |
| Basic Load Ratings : Cr | — | 0.540 kN | — |
| Basic Load Ratings : C0R | — | 0.16 kN | — |
| Fatigue Load Limit : Cu | — | 0.004 kN | — |
| Factor : F0 | — | 14.0 | — |
| Limiting Speeds(Grease Lub.) | — | 60000 min-1 | — |
| Limiting Speeds(Oil Lub.) | — | 72000 min-1 | — |
| Da(Min.) | — | 4.2 mm | — |
| Da(Max.) | — | 7.8 mm | — |
| Ra(Max.) | — | 0.15 mm | — |
| Mass(Refer.) | — | 0.9 g | — |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.