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| Parameter | TIMKEN12580 / 1252020.637 × 49.225 × 19.845 mm | KOYO12580/2020.638 × 49.225 × 19.845 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | 12580 / 12520 | 12580/20 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | 12500 | — |
| Bore diameterd | 20.637 mm | 20.638 mm |
| Outside diameterD | 49.225 mm | 49.225 mm |
| WidthB | 19.845 mm | 19.845 mm |
| Basic dynamic load ratingC | 43.6 kN | 45.5 kN |
| Basic static load ratingC0 | 43.2 kN | 37.7 kN |
| Fatigue load limitPu | — | 5.35 kN |
| Limiting speednG | — | 8600 r/min |
| Mass≈m | 0.18 kg | 0.183 kg |
| Precision class | ABMA Class 2 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.81 | — |
| Y1 Factor | 1.86 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 1.02 | — |
| E Factor | 0.32 | — |
| Cg Factor | 0.0495 | — |
| 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 | 000000000100054546 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | 12580_12520 | — |
| Inner Ring Part Number | 12580 | — |
| Outer Ring Part Number | 12520 | — |
| Drawing Number | A-10414 | — |
| Upc | 0053893664217 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:47.063 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 0.8125 in Bore | 1.9380 in OD | 0.7813 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 49.225 mm |
| T | — | 19.845 mm |
| B | — | 19.845 mm |
| C | — | 15.875 mm |
| Overall Width | 22.145 mm | — |
| R(Min.) | — | 1.6 mm |
| Radial Rating | 11,300 N | — |
| R1(Min.) | — | 1.6 mm |
| Axial Rating | 6,260 N | — |
| Basic Load Ratings : Cr | — | 45.5 kN |
| Dynamic Rating C1 | 43,600 N | — |
| Basic Load Ratings : C0R | — | 37.7 kN |
| Dynamic Rating C90 | 11,300 N | — |
| Fatigue Load Limit : Cu | — | 5.35 kN |
| Dynamic Axial Rating Ca90 | 6,260 N | — |
| Limiting Speeds(Grease Lub.) | — | 8600 min-1 |
| Dynamic Axial Rating Ca1 | 24,100 N | — |
| Limiting Speeds(Oil Lub.) | — | 12000 min-1 |
| Static Radial Rating C0 | 43,200 N | — |
| Load Center Spread : A | — | 12.7 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Constant :E | — | 0.32 |
| Static Axial Rating C0A | 40,700 N | — |
| Axial Load Factors : Y1 | — | 1.86 |
| Axial Load Factors : Y0 | — | 1.02 |
| Da | — | 42.5 mm |
| Db | — | 45.5 mm |
| Ra(Max.) | — | 1.6 mm |
| Rb(Max.) | — | 1.6 mm |
| Mass(Refer.) | — | 0.183 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.