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
“M278749” 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 | TIMKENM278749 / M278710571.5 × 812.8 × 155.575 mm | KOYOM278749D/710/710D571.5 × 812.8 × 593.725 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | M278749 / M278710 | M278749D/710/710D |
| Product family | TS - Tapered Single | Four-row tapered roller bearings |
| Detailed type | Tapered roller bearings | Rolling mill roll neck bearings |
| Series | M278700 | — |
| Bore diameterd | 571.5 mm | 571.5 mm |
| Outside diameterD | 812.8 mm | 812.8 mm |
| WidthB | 155.575 mm | 593.725 mm |
| Basic dynamic load ratingC | 4530 kN | 14000 kN |
| Basic static load ratingC0 | 10600 kN | 35000 kN |
| Fatigue load limitPu | — | 2790 kN |
| Mass≈m | 255.86 kg | 1020 kg |
| Precision class | ABMA Class 2 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.76 | — |
| Y1 Factor | 1.80 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 0.99 | — |
| E Factor | 0.33 | — |
| Cg Factor | 0.2990 | — |
| 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 | 000000000100174000 | — |
| Official Class Key | — | 140-020-000 |
| World Assembly Part Number | M278749_M278710 | — |
| Inner Ring Part Number | M278749 | — |
| Outer Ring Part Number | M278710 | — |
| Drawing Number | E-47839 | — |
| Upc | 0053893797519 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:47.4 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 22.5000 in Bore | 32.0000 in OD | 6.1250 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 812.800 mm |
| T | — | 593.725 mm |
| W | — | 593.725 mm |
| R(Min.) | — | 6.4 mm |
| R1(Min.) | — | 3.2 mm |
| Overall Width | 177.675 mm | — |
| Basic Load Ratings : Cr | — | 14000 kN |
| Radial Rating | 1,180,000 N | — |
| Basic Load Ratings : C0R | — | 35000 kN |
| Axial Rating | 669,000 N | — |
| Fatigue Load Limit : Cu | — | 2790 kN |
| Dynamic Rating C1 | 4,530,000 N | — |
| Axial Load Factors : Y2 | — | 2.03 mm |
| Dynamic Rating C90 | 1,180,000 N | — |
| Axial Load Factors : Y3 | — | 3.02 |
| Dynamic Axial Rating Ca90 | 669,000 N | — |
| Axial Load Factors : Y0 | — | 1.98 |
| Dynamic Axial Rating Ca1 | 2,580,000 N | — |
| Constant E | — | 0.33 |
| Static Radial Rating C0 | 10,600,000 N | — |
| Da(Min.) | — | 625 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Da(Max.) | — | 751 mm |
| Static Axial Rating C0A | 10,200,000 N | — |
| S(Min.) | — | 14 mm |
| Ra(Max.) | — | 6.4 mm |
| Rb(Max.) | — | 3.2 mm |
| Mass(Refer.) | — | 1020 kg |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.