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| Parameter | TIMKENM270449DA-902A1449.948 × 594.949 × 178 mm | KOYOM270449D/10/10D449.949 × 594.949 × 368 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | M270449DA-902A1 | M270449D/10/10D |
| Product family | TDI - Tapered Double Inner | Four-row tapered roller bearings |
| Detailed type | Tapered roller bearings | Rolling mill roll neck bearings |
| Series | M270400 | — |
| Bore diameterd | 449.948 mm | 449.949 mm |
| Outside diameterD | 594.949 mm | 594.949 mm |
| WidthB | 178 mm | 368 mm |
| Basic dynamic load ratingC | 3470 kN | 6400 kN |
| Basic static load ratingC0 | 9560 kN | 16200 kN |
| Fatigue load limitPu | — | 1470 kN |
| Mass≈m | 137.89 kg | 278 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 | 0.2343 | — |
| 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 | 000000000100178012 | — |
| Official Class Key | — | 140-020-000 |
| World Assembly Part Number | M270449DA_M270410 | — |
| Inner Ring Part Number | M270449DA | — |
| Outer Ring Part Number | M270410 | — |
| Drawing Number | E-39015 | — |
| Upc | 0053893175560 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:46.143 | — |
| Product Identity | ||
| Type Description | TDI - Tapered Double Inner | — |
| Construction | Double Row Tapered Roller Bearing Assembly | Imperial Series | 17.7145 in Bore | 23.4232 in OD | 7.0079 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 2 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 594.949 mm |
| T | — | 368.000 mm |
| W | — | 368.000 mm |
| R(Min.) | — | 5 mm |
| R1(Min.) | — | 2.5 mm |
| Overall Width | 0.000 mm | — |
| Basic Load Ratings : Cr | — | 6400 kN |
| Radial Rating | 900,000 N | — |
| Basic Load Ratings : C0R | — | 16200 kN |
| Axial Rating | 294,000 N | — |
| Fatigue Load Limit : Cu | — | 1470 kN |
| Dynamic Rating C1 | 3,470,000 N | — |
| Axial Load Factors : Y2 | — | 2.03 mm |
| Dynamic Rating C90 | 900,000 N | — |
| Axial Load Factors : Y3 | — | 3.02 |
| Dynamic Axial Rating Ca90 | 294,000 N | — |
| Axial Load Factors : Y0 | — | 1.98 |
| Dynamic Axial Rating Ca1 | 1,140,000 N | — |
| Constant E | — | 0.33 |
| Static Radial Rating C0 | 9,560,000 N | — |
| Da(Min.) | — | 478 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Da(Max.) | — | 557 mm |
| Static Axial Rating C0A | 4,630,000 N | — |
| S(Min.) | — | 9 mm |
| Ra(Max.) | — | 5 mm |
| Rb(Max.) | — | 2 mm |
| Mass(Refer.) | — | 278 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.