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| Parameter | TIMKEN66589 / 6652059.972 × 122.238 × 33.343 mm | KOYO66589/2059.972 × 122.238 × 31.75 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | 66589 / 66520 | 66589/20 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | 66500 | — |
| Bore diameterd | 59.972 mm | 59.972 mm |
| Outside diameterD | 122.238 mm | 122.238 mm |
| WidthB | 33.343 mm | 31.75 mm |
| Basic dynamic load ratingC | 183 kN | 160 kN |
| Basic static load ratingC0 | 178 kN | 153 kN |
| Fatigue load limitPu | — | 23.3 kN |
| Limiting speednG | — | 3300 r/min |
| Mass≈m | 1.64 kg | 1.661 kg |
| Precision class | ABMA Class 7 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 0.88 | — |
| Y1 Factor | 0.90 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 0.50 | — |
| E Factor | 0.67 | — |
| Cg Factor | 0.0797 | — |
| 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 | 000000000100014526 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | 66589_66520 | — |
| Inner Ring Part Number | 66589 | — |
| Outer Ring Part Number | 66520 | — |
| Drawing Number | B-154256 | — |
| Upc | 0053893299969 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:47.283 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 2.3611 in Bore | 4.8125 in OD | 1.3127 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 7 | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 122.238 mm |
| T | — | 33.338 mm |
| B | — | 31.750 mm |
| C | — | 23.812 mm |
| Overall Width | 39.150 mm | — |
| R(Min.) | — | 0.8 mm |
| Radial Rating | 47,500 N | — |
| R1(Min.) | — | 3.2 mm |
| Axial Rating | 54,100 N | — |
| Basic Load Ratings : Cr | — | 160 kN |
| Dynamic Rating C1 | 183,000 N | — |
| Basic Load Ratings : C0R | — | 153 kN |
| Dynamic Rating C90 | 47,500 N | — |
| Fatigue Load Limit : Cu | — | 23.3 kN |
| Dynamic Axial Rating Ca90 | 54,100 N | — |
| Limiting Speeds(Grease Lub.) | — | 3300 min-1 |
| Dynamic Axial Rating Ca1 | 209,000 N | — |
| Limiting Speeds(Oil Lub.) | — | 4300 min-1 |
| Static Radial Rating C0 | 178,000 N | — |
| Load Center Spread : A | — | 35.4 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Constant :E | — | 0.67 |
| Static Axial Rating C0A | 344,000 N | — |
| Axial Load Factors : Y1 | — | 0.90 |
| Axial Load Factors : Y0 | — | 0.50 |
| Da | — | 105.0 mm |
| Db | — | 116.0 mm |
| Ra(Max.) | — | 0.8 mm |
| Rb(Max.) | — | 3.2 mm |
| Mass(Refer.) | — | 1.661 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.