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| Parameter | TIMKENLM258649D-90029317.5 × 422.275 × 128.588 mm | KOYOLM258649D/610/610D317.5 × 422.275 × 269.875 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | LM258649D-90029 | LM258649D/610/610D |
| Product family | TDI - Tapered Double Inner | Four-row tapered roller bearings |
| Detailed type | Tapered roller bearings | Rolling mill roll neck bearings |
| Series | LM258600 | — |
| Bore diameterd | 317.5 mm | 317.5 mm |
| Outside diameterD | 422.275 mm | 422.275 mm |
| WidthB | 128.588 mm | 269.875 mm |
| Basic dynamic load ratingC | 1720 kN | 3140 kN |
| Basic static load ratingC0 | 4460 kN | 7450 kN |
| Fatigue load limitPu | — | 747 kN |
| Mass≈m | 50.26 kg | 104 kg |
| Precision class | ABMA Class 2 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.83 | — |
| Y1 Factor | 2.11 | — |
| Y2 Factor | 3.15 | — |
| Y0 Factor | 2.07 | — |
| E Factor | 0.32 | — |
| Cg Factor | 0.1739 | — |
| 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 | 000000000100180865 | — |
| Official Class Key | — | 140-020-000 |
| World Assembly Part Number | LM258649D_LM258610 | — |
| Inner Ring Part Number | LM258649D | — |
| Outer Ring Part Number | LM258610 | — |
| Drawing Number | C-33763 | — |
| Upc | 0053893121826 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:46.323 | — |
| Product Identity | ||
| Type Description | TDI - Tapered Double Inner | — |
| Construction | Double Row Tapered Roller Bearing Assembly | Imperial Series | 12.5000 in Bore | 16.6250 in OD | 5.0625 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 2 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 422.275 mm |
| T | — | 269.875 mm |
| W | — | 269.875 mm |
| R(Min.) | — | 3.2 mm |
| R1(Min.) | — | 1.6 mm |
| Overall Width | 0.000 mm | — |
| Basic Load Ratings : Cr | — | 3140 kN |
| Radial Rating | 445,000 N | — |
| Basic Load Ratings : C0R | — | 7450 kN |
| Axial Rating | 140,000 N | — |
| Fatigue Load Limit : Cu | — | 747 kN |
| Dynamic Rating C1 | 1,720,000 N | — |
| Axial Load Factors : Y2 | — | 2.12 mm |
| Dynamic Rating C90 | 445,000 N | — |
| Axial Load Factors : Y3 | — | 3.15 |
| Dynamic Axial Rating Ca90 | 140,000 N | — |
| Axial Load Factors : Y0 | — | 2.07 |
| Dynamic Axial Rating Ca1 | 539,000 N | — |
| Constant E | — | 0.32 |
| Static Radial Rating C0 | 4,460,000 N | — |
| Da(Min.) | — | 341 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Da(Max.) | — | 392 mm |
| Static Axial Rating C0A | 2,080,000 N | — |
| S(Min.) | — | 8.5 mm |
| Ra(Max.) | — | 3.2 mm |
| Rb(Max.) | — | 1.6 mm |
| Mass(Refer.) | — | 104 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.