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| Parameter | TIMKENM252349D-90028269.875 × 381 × 136.525 mm | KOYOM252349D/310/310D269.875 × 381 × 282.575 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | M252349D-90028 | M252349D/310/310D |
| Product family | TDI - Tapered Double Inner | Four-row tapered roller bearings |
| Detailed type | Tapered roller bearings | Rolling mill roll neck bearings |
| Series | M252300 | — |
| Bore diameterd | 269.875 mm | 269.875 mm |
| Outside diameterD | 381 mm | 381 mm |
| WidthB | 136.525 mm | 282.575 mm |
| Basic dynamic load ratingC | 2000 kN | 3150 kN |
| Basic static load ratingC0 | 4050 kN | 6690 kN |
| Fatigue load limitPu | — | 697 kN |
| Mass≈m | 49.48 kg | 98.4 kg |
| Precision class | ABMA Class 4 | — |
| 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 | 0.1588 | — |
| 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 | 000000000100182234 | — |
| Official Class Key | — | 140-020-000 |
| World Assembly Part Number | M252349D_M252310 | — |
| Inner Ring Part Number | M252349D | — |
| Outer Ring Part Number | M252310 | — |
| Drawing Number | C-23837 | — |
| Upc | 0053893558134 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:47.673 | — |
| Product Identity | ||
| Type Description | TDI - Tapered Double Inner | — |
| Construction | Double Row Tapered Roller Bearing Assembly | Imperial Series | 10.6250 in Bore | 15.0000 in OD | 5.3750 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 4 | — |
| Number Of Rows | 2 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 381.000 mm |
| T | — | 282.575 mm |
| W | — | 282.575 mm |
| R(Min.) | — | 3.2 mm |
| R1(Min.) | — | 3.2 mm |
| Overall Width | 0.000 mm | — |
| Basic Load Ratings : Cr | — | 3150 kN |
| Radial Rating | 519,000 N | — |
| Basic Load Ratings : C0R | — | 6690 kN |
| Axial Rating | 170,000 N | — |
| Fatigue Load Limit : Cu | — | 697 kN |
| Dynamic Rating C1 | 2,000,000 N | — |
| Axial Load Factors : Y2 | — | 2.03 mm |
| Dynamic Rating C90 | 519,000 N | — |
| Axial Load Factors : Y3 | — | 3.02 |
| Dynamic Axial Rating Ca90 | 170,000 N | — |
| Axial Load Factors : Y0 | — | 1.98 |
| Dynamic Axial Rating Ca1 | 654,000 N | — |
| Constant E | — | 0.33 |
| Static Radial Rating C0 | 4,050,000 N | — |
| Da(Min.) | — | 291 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Da(Max.) | — | 350 mm |
| Static Axial Rating C0A | 1,960,000 N | — |
| S(Min.) | — | 6 mm |
| Ra(Max.) | — | 3.2 mm |
| Rb(Max.) | — | 3.2 mm |
| Mass(Refer.) | — | 98.4 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.