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| Parameter | TIMKEN2580A / 252331.75 × 69.85 × 23.813 mm | KOYO2580/2031.75 × 66.421 × 25.357 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | 2580A / 2523 | 2580/20 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | 2500 | — |
| Bore diameterd | 31.75 mm | 31.75 mm |
| Outside diameterD | 69.85 mm | 66.421 mm |
| WidthB | 23.813 mm | 25.357 mm |
| Basic dynamic load ratingC | 83.7 kN | 89.2 kN |
| Basic static load ratingC0 | 94.4 kN | 85.1 kN |
| Fatigue load limitPu | — | 12.7 kN |
| Limiting speednG | — | 6000 r/min |
| Mass≈m | 0.45 kg | 0.404 kg |
| Calculation Factors | ||
| K Factor | 2.14 | — |
| Y1 Factor | 2.19 | — |
| Y2 Factor | -1.00 | — |
| Y0 Factor | 1.21 | — |
| E Factor | 0.27 | — |
| Cg Factor | 0.0656 | — |
| Classification | ||
| Official Category Path | — | Tapered roller bearings - Single-row - Inch series |
| Official Classification 1 | — | Tapered roller bearings / Single-row / Inch series |
| Manufacturer Identity | ||
| Material Number | 100084884100058850 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | 2580A / 2523 | — |
| Inner Ring Part Number | 2580A | — |
| Outer Ring Part Number | 2523 | — |
| Official Source System | TS_PREPAIR | — |
| Official Last Run | 2026-08-23T00:00:00 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 66.421 mm |
| Overall Width | 26.857 mm | — |
| T | — | 25.400 mm |
| Radial Rating | 21,700 N | — |
| B | — | 25.357 mm |
| Axial Rating | 10,200 N | — |
| C | — | 20.638 mm |
| Dynamic Rating C1 | 83,700 N | — |
| R(Min.) | — | 0.8 mm |
| Dynamic Rating C90 | 21,700 N | — |
| R1(Min.) | — | 3.2 mm |
| Dynamic Axial Rating Ca90 | 10,200 N | — |
| Basic Load Ratings : Cr | — | 89.2 kN |
| Dynamic Axial Rating Ca1 | 39,200 N | — |
| Basic Load Ratings : C0R | — | 85.1 kN |
| Static Radial Rating C0 | 94,400 N | — |
| Fatigue Load Limit : Cu | — | 12.7 kN |
| Extended Dynamic Rating Ce | 0 N | — |
| Limiting Speeds(Grease Lub.) | — | 6000 min-1 |
| Static Axial Rating C0A | 75,200 N | — |
| Limiting Speeds(Oil Lub.) | — | 8000 min-1 |
| Load Center Spread : A | — | 16.0 mm |
| Constant :E | — | 0.27 |
| Axial Load Factors : Y1 | — | 2.19 |
| Axial Load Factors : Y0 | — | 1.21 |
| Da | — | 57.0 mm |
| Db | — | 62.5 mm |
| Ra(Max.) | — | 0.8 mm |
| Rb(Max.) | — | 3.2 mm |
| Mass(Refer.) | — | 0.404 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.