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| Parameter | TIMKENJM612949 / JM61291070 × 115 × 29 mm | KOYOJM612949/1070 × 115 × 29 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | JM612949 / JM612910 | JM612949/10 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | M612900 | — |
| Bore diameterd | 70 mm | 70 mm |
| Outside diameterD | 115 mm | 115 mm |
| WidthB | 29 mm | 29 mm |
| Basic dynamic load ratingC | 178 kN | 155 kN |
| Basic static load ratingC0 | 198 kN | 173 kN |
| Fatigue load limitPu | — | 26.6 kN |
| Limiting speednG | — | 3200 r/min |
| Mass≈m | 1.12 kg | 1.134 kg |
| Precision class | ABMA Class N | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.36 | — |
| Y1 Factor | 1.39 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 0.77 | — |
| E Factor | 0.43 | — |
| Cg Factor | 0.1122 | — |
| 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 | 000000000100087421 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | JM612949_JM612910 | — |
| Inner Ring Part Number | JM612949 | — |
| Outer Ring Part Number | JM612910 | — |
| Drawing Number | A-35615 | — |
| Upc | 0053893662046 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:46.313 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 2.7559 in Bore | 4.5276 in OD | 1.1417 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class N | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 115.000 mm |
| T | — | 29.000 mm |
| B | — | 29.000 mm |
| C | — | 23.000 mm |
| Overall Width | 32.300 mm | — |
| R(Min.) | — | 3.0 mm |
| Radial Rating | 46,100 N | — |
| R1(Min.) | — | 2.5 mm |
| Axial Rating | 33,900 N | — |
| Basic Load Ratings : Cr | — | 155 kN |
| Dynamic Rating C1 | 178,000 N | — |
| Basic Load Ratings : C0R | — | 173 kN |
| Dynamic Rating C90 | 46,100 N | — |
| Fatigue Load Limit : Cu | — | 26.6 kN |
| Dynamic Axial Rating Ca90 | 33,900 N | — |
| Limiting Speeds(Grease Lub.) | — | 3200 min-1 |
| Dynamic Axial Rating Ca1 | 131,000 N | — |
| Limiting Speeds(Oil Lub.) | — | 4300 min-1 |
| Static Radial Rating C0 | 198,000 N | — |
| Load Center Spread : A | — | 26.2 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Constant :E | — | 0.43 |
| Static Axial Rating C0A | 248,000 N | — |
| Axial Load Factors : Y1 | — | 1.39 |
| Axial Load Factors : Y0 | — | 0.77 |
| Da | — | 103.0 mm |
| Db | — | 110.0 mm |
| Ra(Max.) | — | 3.0 mm |
| Rb(Max.) | — | 2.5 mm |
| Mass(Refer.) | — | 1.134 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.