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| Parameter | TIMKENL21549 / L2151115.875 × 34.988 × 10.998 mm | KOYOL21549/1115.875 × 34.988 × 10.998 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | L21549 / L21511 | L21549/11 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | L21500 | — |
| Bore diameterd | 15.875 mm | 15.875 mm |
| Outside diameterD | 34.988 mm | 34.988 mm |
| WidthB | 10.998 mm | 10.998 mm |
| Basic dynamic load ratingC | 14.3 kN | 18.1 kN |
| Basic static load ratingC0 | 13.9 kN | 14.3 kN |
| Fatigue load limitPu | — | 1.9 kN |
| Limiting speednG | — | 12000 r/min |
| Mass≈m | 0.06 kg | 0.049 kg |
| Precision class | ABMA Class 2 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.83 | — |
| Y1 Factor | 1.88 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 1.04 | — |
| E Factor | 0.32 | — |
| Cg Factor | 0.0348 | — |
| 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 | 000000000100044923 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | L21549_L21511 | — |
| Inner Ring Part Number | L21549 | — |
| Outer Ring Part Number | L21511 | — |
| Drawing Number | A-23801 | — |
| Upc | 0053893758381 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:47.08 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 0.6250 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 | — | 10.998 mm |
| C | — | 8.712 mm |
| Overall Width | 12.998 mm | — |
| R(Min.) | — | 1.2 mm |
| Radial Rating | 3,720 N | — |
| R1(Min.) | — | 1.2 mm |
| Axial Rating | 2,030 N | — |
| Basic Load Ratings : Cr | — | 18.1 kN |
| Dynamic Rating C1 | 14,300 N | — |
| Basic Load Ratings : C0R | — | 14.3 kN |
| Dynamic Rating C90 | 3,720 N | — |
| Fatigue Load Limit : Cu | — | 1.90 kN |
| Dynamic Axial Rating Ca90 | 2,030 N | — |
| Limiting Speeds(Grease Lub.) | — | 12000 min-1 |
| Dynamic Axial Rating Ca1 | 7,830 N | — |
| Limiting Speeds(Oil Lub.) | — | 16000 min-1 |
| Static Radial Rating C0 | 13,900 N | — |
| Load Center Spread : A | — | 7.6 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Constant :E | — | 0.32 |
| Static Axial Rating C0A | 12,900 N | — |
| Axial Load Factors : Y1 | — | 1.88 |
| Axial Load Factors : Y0 | — | 1.04 |
| Da | — | 29.0 mm |
| Db | — | 32.5 mm |
| Ra(Max.) | — | 1.2 mm |
| Rb(Max.) | — | 1.2 mm |
| Mass(Refer.) | — | 0.049 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.