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| Parameter | TIMKENLM278849D-90013585.788 × 771.525 × 230.188 mm | KOYOLM278849D/810/810D585.788 × 771.525 × 479.425 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | LM278849D-90013 | LM278849D/810/810D |
| Product family | TDI - Tapered Double Inner | Four-row tapered roller bearings |
| Detailed type | Tapered roller bearings | Rolling mill roll neck bearings |
| Series | LM278800 | — |
| Bore diameterd | 585.788 mm | 585.788 mm |
| Outside diameterD | 771.525 mm | 771.525 mm |
| WidthB | 230.188 mm | 479.425 mm |
| Basic dynamic load ratingC | 5730 kN | 9790 kN |
| Basic static load ratingC0 | 16600 kN | 25600 kN |
| Fatigue load limitPu | — | 2120 kN |
| Mass≈m | 303.69 kg | 599 kg |
| Precision class | ABMA Class 2 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.76 | — |
| Y1 Factor | 2.03 | — |
| Y2 Factor | 3.02 | — |
| Y0 Factor | 1.98 | — |
| E Factor | 0.33 | — |
| Cg Factor | 0.2906 | — |
| Classification | ||
| Official Category Path | — | Rolling mill roll neck bearings - Four-row tapered roller bearings |
| Official Classification 1 | — | Rolling mill roll neck bearings / Four-row tapered roller bearings |
| Manufacturer Identity | ||
| Material Number | 000000000100077515 | — |
| Official Class Key | — | 140-020-000 |
| World Assembly Part Number | LM278849D_LM278810 | — |
| Inner Ring Part Number | LM278849D | — |
| Outer Ring Part Number | LM278810 | — |
| Drawing Number | E-27055 | — |
| Upc | 0053893582269 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:47.683 | — |
| Product Identity | ||
| Type Description | TDI - Tapered Double Inner | — |
| Construction | Double Row Tapered Roller Bearing Assembly | Imperial Series | 23.0625 in Bore | 30.3750 in OD | 9.0625 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 2 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 771.525 mm |
| T | — | 479.425 mm |
| W | — | 479.425 mm |
| R(Min.) | — | 6.4 mm |
| R1(Min.) | — | 3.2 mm |
| Overall Width | 0.000 mm | — |
| Basic Load Ratings : Cr | — | 9790 kN |
| Radial Rating | 1,490,000 N | — |
| Basic Load Ratings : C0R | — | 25600 kN |
| Axial Rating | 486,000 N | — |
| Fatigue Load Limit : Cu | — | 2120 kN |
| Dynamic Rating C1 | 5,730,000 N | — |
| Axial Load Factors : Y2 | — | 2.03 mm |
| Dynamic Rating C90 | 1,490,000 N | — |
| Axial Load Factors : Y3 | — | 3.02 |
| Dynamic Axial Rating Ca90 | 486,000 N | — |
| Axial Load Factors : Y0 | — | 1.98 |
| Dynamic Axial Rating Ca1 | 1,870,000 N | — |
| Constant E | — | 0.33 |
| Static Radial Rating C0 | 16,600,000 N | — |
| Da(Min.) | — | 622 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Da(Max.) | — | 725 mm |
| Static Axial Rating C0A | 8,020,000 N | — |
| S(Min.) | — | 11 mm |
| Ra(Max.) | — | 6.4 mm |
| Rb(Max.) | — | 3.2 mm |
| Mass(Refer.) | — | 599 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.