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| Parameter | TIMKENA4059 / A413814.989 × 34.988 × 10.998 mm | KOYOA4059/13814.989 × 34.988 × 10.988 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | A4059 / A4138 | A4059/138 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | A4000 | — |
| Bore diameterd | 14.989 mm | 14.989 mm |
| Outside diameterD | 34.988 mm | 34.988 mm |
| WidthB | 10.998 mm | 10.988 mm |
| Basic dynamic load ratingC | 15.6 kN | 15.7 kN |
| Basic static load ratingC0 | 11.5 kN | 11.9 kN |
| Fatigue load limitPu | — | 1.55 kN |
| Limiting speednG | — | 12000 r/min |
| Mass≈m | 0.04 kg | 0.051 kg |
| Precision class | ABMA Class 2 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.29 | — |
| Y1 Factor | 1.32 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 0.73 | — |
| E Factor | 0.45 | — |
| Cg Factor | 0.0355 | — |
| 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 | 000000000100156615 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | KA4059_A4138 | — |
| Inner Ring Part Number | KA4059 | — |
| Outer Ring Part Number | A4138 | — |
| Drawing Number | A-5687 | — |
| Upc | 0053893652801 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:46.737 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 0.5901 in Bore | 1.3775 in OD | 0.4330 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 34.988 mm |
| T | — | 10.998 mm |
| B | — | 10.988 mm |
| C | — | 8.730 mm |
| Overall Width | 12.788 mm | — |
| R(Min.) | — | 0.8 mm |
| Radial Rating | 4,040 N | — |
| R1(Min.) | — | 1.2 mm |
| Axial Rating | 3,130 N | — |
| Basic Load Ratings : Cr | — | 15.7 kN |
| Dynamic Rating C1 | 15,600 N | — |
| Basic Load Ratings : C0R | — | 11.9 kN |
| Dynamic Rating C90 | 4,040 N | — |
| Fatigue Load Limit : Cu | — | 1.55 kN |
| Dynamic Axial Rating Ca90 | 3,130 N | — |
| Limiting Speeds(Grease Lub.) | — | 12000 min-1 |
| Dynamic Axial Rating Ca1 | 12,100 N | — |
| Limiting Speeds(Oil Lub.) | — | 17000 min-1 |
| Static Radial Rating C0 | 11,500 N | — |
| Load Center Spread : A | — | 8.3 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Constant :E | — | 0.45 |
| Static Axial Rating C0A | 15,200 N | — |
| Axial Load Factors : Y1 | — | 1.33 |
| Axial Load Factors : Y0 | — | 0.73 |
| Da | — | 29.0 mm |
| Db | — | 32.0 mm |
| Ra(Max.) | — | 0.8 mm |
| Rb(Max.) | — | 1.2 mm |
| Mass(Refer.) | — | 0.051 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.