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.
Dimensions differ
“637” across 3 loaded brands
The base designation is shared, but the loaded boundary dimensions do not agree. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| Parameter | TIMKEN637 / 63260.325 × 136.525 × 41.275 mm | NSK6377 × 26 × 9 mm | KOYO6377 × 26 × 9 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | TIMKEN | NSK | KOYO |
| Designation | 637 / 632 | 637 | 637 |
| Product family | TS - Tapered Single | Single row deep groove ball bearings | Extra-small, miniature ball bearings / Standard type / Open |
| Detailed type | Tapered roller bearings | Deep groove ball bearings | Deep groove ball bearings |
| Series | 635 | — | — |
| Bore diameterd | 60.325 mm | 7 mm | 7 mm |
| Outside diameterD | 136.525 mm | 26 mm | 26 mm |
| WidthB | 41.275 mm | 9 mm | 9 mm |
| Basic dynamic load ratingC | 233 kN | 5.05 kN | 5.65 kN |
| Basic static load ratingC0 | 298 kN | 1.97 kN | 1.95 kN |
| Fatigue load limitPu | — | — | 0.1 kN |
| Limiting speednG | — | — | 26000 r/min |
| Mass≈m | 2.94 kg | 0.024 kg | 0.024 kg |
| Precision class | ABMA Class 2 | — | — |
| Sealing | Open | Open | Open |
| Cage | Steel cage | — | — |
| Boundary dimensions | |||
| Bearing width (open)B | — | 9 mm | — |
| Minimum bearing chamferr min. | — | 0.3 mm | — |
| Calculation Factors | |||
| K Factor | 1.61 | — | — |
| Y1 Factor | 1.66 | — | — |
| Y2 Factor | 0.00 | — | — |
| Y0 Factor | 0.91 | — | — |
| E Factor | 0.36 | — | — |
| Cg Factor | 0.0814 | — | — |
| 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 | — |
| Load ratings | |||
| Basic dynamic radial load ratingCr | — | 5050 N | — |
| Basic static radial load ratingC0r | — | 1970 N | — |
| Lubrication-qualified speed | |||
| Limiting speed with grease | — | 28000 r/min | — |
| Limiting speed with oil (open) | — | 34000 r/min | — |
| Manufacturer Identity | |||
| Material Number | 000000000100034300 | — | — |
| Official Class Key | — | — | 010-020-010 |
| World Assembly Part Number | 637_632 | — | — |
| Inner Ring Part Number | 637 | — | — |
| Outer Ring Part Number | 632 | — | — |
| Drawing Number | A-3644 | — | — |
| Upc | 0053893722931 | — | — |
| Official Source System | CORE BP - DS DF | — | — |
| Official Last Run | 2026-08-23T20:02:47.583 | — | — |
| Mounting dimensions | |||
| Minimum shaft shoulder diameter (open)da min. | — | 9 mm | — |
| Maximum adjacent fillet radiusra max. | — | 0.3 mm | — |
| Maximum housing shoulder diameter (open)Da max. | — | 24 mm | — |
| Product Identity | |||
| Type Description | TS - Tapered Single | — | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 2.3750 in Bore | 5.3750 in OD | 1.6250 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — | — |
| Number Of Rows | 1 | — | — |
| Tapered Bore | N | — | — |
| Reference mass | |||
| Approximate catalogue mass (open) | — | 24 g | — |
| Technical Data | |||
| d | — | — | 26 mm |
| B | — | — | 9 mm |
| R(Min.) | — | — | 0.3 mm |
| Basic Load Ratings : Cr | — | — | 5.65 kN |
| Overall Width | 47.575 mm | — | — |
| Basic Load Ratings : C0R | — | — | 1.95 kN |
| Radial Rating | 60,400 N | — | — |
| Fatigue Load Limit : Cu | — | — | 0.100 kN |
| Axial Rating | 37,400 N | — | — |
| Factor : F0 | — | — | 12.3 |
| Dynamic Rating C1 | 233,000 N | — | — |
| Limiting Speeds(Grease Lub.) | — | — | 26000 min-1 |
| Dynamic Rating C90 | 60,400 N | — | — |
| Limiting Speeds(Oil Lub.) | — | — | 32000 min-1 |
| Dynamic Axial Rating Ca90 | 37,400 N | — | — |
| Da(Min.) | — | — | 9 mm |
| Dynamic Axial Rating Ca1 | 144,000 N | — | — |
| Da(Max.) | — | — | 24 mm |
| Static Radial Rating C0 | 298,000 N | — | — |
| Ra(Max.) | — | — | 0.3 mm |
| Extended Dynamic Rating Ce | 0 N | — | — |
| Mass(Refer.) | — | — | 24 g |
| Static Axial Rating C0A | 314,000 N | — | — |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.