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| Parameter | TIMKENL521949-90010107.95 × 146.05 × 21.433 mm | KOYOL521949R/10107.95 × 146.05 × 21.432 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | L521949-90010 | L521949R/10 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | L521900 | — |
| Bore diameterd | 107.95 mm | 107.95 mm |
| Outside diameterD | 146.05 mm | 146.05 mm |
| WidthB | 21.433 mm | 21.432 mm |
| Basic dynamic load ratingC | 96 kN | 108 kN |
| Basic static load ratingC0 | 175 kN | 167 kN |
| Fatigue load limitPu | — | 23.5 kN |
| Limiting speednG | — | 2300 r/min |
| Mass≈m | 0.99 kg | 0.99 kg |
| Precision class | ABMA Class 0 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.49 | — |
| Y1 Factor | 1.53 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 0.84 | — |
| E Factor | 0.39 | — |
| Cg Factor | 0.1346 | — |
| 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 | 000000000100062256 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | L521949_L521910 | — |
| Inner Ring Part Number | L521949 | — |
| Outer Ring Part Number | L521910 | — |
| Drawing Number | A-14903 | — |
| Upc | 0053893633367 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:46.307 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Precision Tapered Roller Bearing Assembly | Imperial Series | 4.2500 in Bore | 5.7500 in OD | 0.8438 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 0 | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 146.050 mm |
| T | — | 21.432 mm |
| B | — | 21.432 mm |
| C | — | 16.670 mm |
| Overall Width | 24.233 mm | — |
| R(Min.) | — | 1.6 mm |
| Radial Rating | 24,900 N | — |
| R1(Min.) | — | 1.6 mm |
| Axial Rating | 16,700 N | — |
| Basic Load Ratings : Cr | — | 108 kN |
| Dynamic Rating C1 | 96,000 N | — |
| Basic Load Ratings : C0R | — | 167 kN |
| Dynamic Rating C90 | 24,900 N | — |
| Fatigue Load Limit : Cu | — | 23.5 kN |
| Dynamic Axial Rating Ca90 | 16,700 N | — |
| Limiting Speeds(Grease Lub.) | — | 2300 min-1 |
| Dynamic Axial Rating Ca1 | 64,500 N | — |
| Limiting Speeds(Oil Lub.) | — | 3100 min-1 |
| Static Radial Rating C0 | 175,000 N | — |
| Load Center Spread : A | — | 26.2 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Constant :E | — | 0.39 |
| Static Axial Rating C0A | 200,000 N | — |
| Axial Load Factors : Y1 | — | 1.53 |
| Axial Load Factors : Y0 | — | 0.84 |
| Da | — | 136.0 mm |
| Db | — | 141.0 mm |
| Ra(Max.) | — | 1.6 mm |
| Rb(Max.) | — | 1.6 mm |
| Mass(Refer.) | — | 0.99 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.