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| Parameter | TIMKENHM266449H-902A9384.175 × 546.1 × 222.25 mm | KOYOHM266449D/410/410D384.175 × 546.1 × 400.05 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | HM266449H-902A9 | HM266449D/410/410D |
| Product family | TDO - Tapered Double Outer | Four-row tapered roller bearings |
| Detailed type | Tapered roller bearings | Rolling mill roll neck bearings |
| Series | HM266400 | — |
| Bore diameterd | 384.175 mm | 384.175 mm |
| Outside diameterD | 546.1 mm | 546.1 mm |
| WidthB | 222.25 mm | 400.05 mm |
| Basic dynamic load ratingC | 4220 kN | 7010 kN |
| Basic static load ratingC0 | 8140 kN | 16900 kN |
| Fatigue load limitPu | — | 1550 kN |
| Mass≈m | 159.38 kg | 315 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 | 0.2099 | — |
| 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 | 000000000100077861 | — |
| Official Class Key | — | 140-020-000 |
| World Assembly Part Number | HM266449H_HM266410CD | — |
| Inner Ring Part Number | HM266449H | — |
| Outer Ring Part Number | HM266410CD | — |
| Drawing Number | E-38848 | — |
| Upc | 0053893753584 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:48.503 | — |
| Product Identity | ||
| Type Description | TDO - Tapered Double Outer | — |
| Construction | Double Row Tapered Roller Bearing Assembly | Imperial Series | 15.1250 in Bore | 21.5000 in OD | 8.7500 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 2 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 546.100 mm |
| T | — | 400.050 mm |
| W | — | 400.050 mm |
| R(Min.) | — | 6.4 mm |
| R1(Min.) | — | 3.2 mm |
| Overall Width | 0.000 mm | — |
| Basic Load Ratings : Cr | — | 7010 kN |
| Radial Rating | 1,090,000 N | — |
| Basic Load Ratings : C0R | — | 16900 kN |
| Axial Rating | 358,000 N | — |
| Fatigue Load Limit : Cu | — | 1550 kN |
| Dynamic Rating C1 | 4,220,000 N | — |
| Axial Load Factors : Y2 | — | 2.03 mm |
| Dynamic Rating C90 | 1,090,000 N | — |
| Axial Load Factors : Y3 | — | 3.02 |
| Dynamic Axial Rating Ca90 | 358,000 N | — |
| Axial Load Factors : Y0 | — | 1.98 |
| Dynamic Axial Rating Ca1 | 1,380,000 N | — |
| Constant E | — | 0.33 |
| Static Radial Rating C0 | 8,140,000 N | — |
| Da(Min.) | — | 418 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Da(Max.) | — | 502 mm |
| Static Axial Rating C0A | 3,940,000 N | — |
| S(Min.) | — | 10.5 mm |
| Ra(Max.) | — | 6.4 mm |
| Rb(Max.) | — | 3.2 mm |
| Mass(Refer.) | — | 315 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.