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| Parameter | TIMKEN28579 / 2852049.987 × 89.98 × 24.749 mm | KOYO28579R/2149.987 × 92.075 × 25.4 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | 28579 / 28520 | 28579R/21 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | 28500 | — |
| Bore diameterd | 49.987 mm | 49.987 mm |
| Outside diameterD | 89.98 mm | 92.075 mm |
| WidthB | 24.749 mm | 25.4 mm |
| Basic dynamic load ratingC | 98.9 kN | 107 kN |
| Basic static load ratingC0 | 130 kN | 119 kN |
| Fatigue load limitPu | — | 17.9 kN |
| Limiting speednG | — | 4200 r/min |
| Mass≈m | 0.66 kg | 0.71 kg |
| Calculation Factors | ||
| K Factor | 1.55 | — |
| Y1 Factor | 1.59 | — |
| Y2 Factor | -1.00 | — |
| Y0 Factor | 0.87 | — |
| E Factor | 0.38 | — |
| Cg Factor | 0.0912 | — |
| 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 | 100053016100050006 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | 28579 / 28520 | — |
| Inner Ring Part Number | 28579 | — |
| Outer Ring Part Number | 28520 | — |
| 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 | — | 92.075 mm |
| Overall Width | 26.900 mm | — |
| T | — | 24.608 mm |
| Radial Rating | 25,700 N | — |
| B | — | 25.400 mm |
| Axial Rating | 16,600 N | — |
| C | — | 19.845 mm |
| Dynamic Rating C1 | 98,900 N | — |
| R(Min.) | — | 2.4 mm |
| Dynamic Rating C90 | 25,700 N | — |
| R1(Min.) | — | 0.8 mm |
| Dynamic Axial Rating Ca90 | 16,600 N | — |
| Basic Load Ratings : Cr | — | 107 kN |
| Dynamic Axial Rating Ca1 | 63,900 N | — |
| Basic Load Ratings : C0R | — | 119 kN |
| Static Radial Rating C0 | 130,000 N | — |
| Fatigue Load Limit : Cu | — | 17.9 kN |
| Extended Dynamic Rating Ce | 0 N | — |
| Limiting Speeds(Grease Lub.) | — | 4200 min-1 |
| Static Axial Rating C0A | 143,000 N | — |
| Limiting Speeds(Oil Lub.) | — | 5600 min-1 |
| Load Center Spread : A | — | 19.9 mm |
| Constant :E | — | 0.38 |
| Axial Load Factors : Y1 | — | 1.59 |
| Axial Load Factors : Y0 | — | 0.87 |
| Da | — | 83.0 mm |
| Db | — | 87.0 mm |
| Ra(Max.) | — | 2.4 mm |
| Rb(Max.) | — | 0.8 mm |
| Mass(Refer.) | — | 0.71 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.