Cross-brand designation analysis
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Same-model Comparison
Explore products that share a base designation across loaded brands, with dimensional agreement and data gaps shown clearly.
Automatic candidate selection
One base designation across loaded brands
Exact designations rank first. Dimensions, suffixes and other technical differences remain visible so the result is not mistaken for an interchangeability declaration.
Dimensions differ
“HM256849” across 2 loaded brands
The base designation is shared, but the loaded boundary dimensions do not agree. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| Parameter | TIMKENHM256849D-90043300.038 × 422.275 × 150.812 mm | KOYOHM256849D/810/810D300.038 × 422.275 × 311.15 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | HM256849D-90043 | HM256849D/810/810D |
| Product family | TDI - Tapered Double Inner | Four-row tapered roller bearings |
| Detailed type | Tapered roller bearings | Rolling mill roll neck bearings |
| Series | HM256800 | — |
| Bore diameterd | 300.038 mm | 300.038 mm |
| Outside diameterD | 422.275 mm | 422.275 mm |
| WidthB | 150.812 mm | 311.15 mm |
| Basic dynamic load ratingC | 2260 kN | 3650 kN |
| Basic static load ratingC0 | 5530 kN | 8050 kN |
| Fatigue load limitPu | — | 818 kN |
| Mass≈m | 69.67 kg | 136 kg |
| Precision class | ABMA Class 4 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.73 | — |
| Y1 Factor | 2.00 | — |
| Y2 Factor | 2.99 | — |
| Y0 Factor | 1.96 | — |
| E Factor | 0.34 | — |
| Cg Factor | 0.1779 | — |
| 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 | 000000000100181416 | — |
| Official Class Key | — | 140-020-000 |
| World Assembly Part Number | HM256849D_HM256810 | — |
| Inner Ring Part Number | HM256849D | — |
| Outer Ring Part Number | HM256810 | — |
| Drawing Number | C-37442 | — |
| Upc | 0053893045689 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:47.397 | — |
| Product Identity | ||
| Type Description | TDI - Tapered Double Inner | — |
| Construction | Double Row Tapered Roller Bearing Assembly | Imperial Series | 11.8125 in Bore | 16.6250 in OD | 5.9375 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 4 | — |
| Number Of Rows | 2 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 422.275 mm |
| T | — | 311.150 mm |
| W | — | 311.150 mm |
| R(Min.) | — | 3.2 mm |
| R1(Min.) | — | 3.2 mm |
| Overall Width | 0.000 mm | — |
| Basic Load Ratings : Cr | — | 3650 kN |
| Radial Rating | 586,000 N | — |
| Basic Load Ratings : C0R | — | 8050 kN |
| Axial Rating | 194,000 N | — |
| Fatigue Load Limit : Cu | — | 818 kN |
| Dynamic Rating C1 | 2,260,000 N | — |
| Axial Load Factors : Y2 | — | 2.00 mm |
| Dynamic Rating C90 | 586,000 N | — |
| Axial Load Factors : Y3 | — | 2.98 |
| Dynamic Axial Rating Ca90 | 194,000 N | — |
| Axial Load Factors : Y0 | — | 1.96 |
| Dynamic Axial Rating Ca1 | 748,000 N | — |
| Constant E | — | 0.34 |
| Static Radial Rating C0 | 5,530,000 N | — |
| Da(Min.) | — | 325 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Da(Max.) | — | 388 mm |
| Static Axial Rating C0A | 2,710,000 N | — |
| S(Min.) | — | 7 mm |
| Ra(Max.) | — | 3.2 mm |
| Rb(Max.) | — | 3.2 mm |
| Mass(Refer.) | — | 136 kg |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.