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| 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 | — | — |
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.