Cross-brand designation analysis
COMPARE / VERIFY
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 verified
“3878” across 2 loaded brands
At least two brands share the same bore, outside diameter and width. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| Parameter | TIMKEN3878 / 382036.512 × 85.725 × 30.162 mm | KOYO3878/2036.512 × 85.725 × 30.162 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | 3878 / 3820 | 3878/20 |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | 3800 | — |
| Bore diameterd | 36.512 mm | 36.512 mm |
| Outside diameterD | 85.725 mm | 85.725 mm |
| WidthB | 30.162 mm | 30.162 mm |
| Basic dynamic load ratingC | 124 kN | 135 kN |
| Basic static load ratingC0 | 148 kN | 136 kN |
| Fatigue load limitPu | — | 20.3 kN |
| Limiting speednG | — | 4800 r/min |
| Mass≈m | 0.88 kg | 0.89 kg |
| Precision class | ABMA Class 2 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.45 | — |
| Y1 Factor | 1.49 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 0.82 | — |
| E Factor | 0.40 | — |
| Cg Factor | 0.0873 | — |
| Classification | ||
| Official Category Path | — | Tapered roller bearings - Single-row - Inch series |
| Official Classification 1 | — | Tapered roller bearings / Single-row / Inch series |
| Manufacturer Identity | ||
| Material Number | 000000000100375741 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | 3878_3820 | — |
| Inner Ring Part Number | 3878 | — |
| Outer Ring Part Number | 3820 | — |
| Drawing Number | A-6278 | — |
| Upc | 0013992331908 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:46.737 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 1.4375 in Bore | 3.3750 in OD | 1.1875 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 85.725 mm |
| T | — | 30.162 mm |
| B | — | 30.162 mm |
| C | — | 23.812 mm |
| Overall Width | 33.962 mm | — |
| R(Min.) | — | 0.8 mm |
| Radial Rating | 32,200 N | — |
| R1(Min.) | — | 3.2 mm |
| Axial Rating | 22,200 N | — |
| Basic Load Ratings : Cr | — | 135 kN |
| Dynamic Rating C1 | 124,000 N | — |
| Basic Load Ratings : C0R | — | 136 kN |
| Dynamic Rating C90 | 32,200 N | — |
| Fatigue Load Limit : Cu | — | 20.3 kN |
| Dynamic Axial Rating Ca90 | 22,200 N | — |
| Limiting Speeds(Grease Lub.) | — | 4800 min-1 |
| Dynamic Axial Rating Ca1 | 85,500 N | — |
| Limiting Speeds(Oil Lub.) | — | 6400 min-1 |
| Static Radial Rating C0 | 148,000 N | — |
| Load Center Spread : A | — | 22.9 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Constant :E | — | 0.40 |
| Static Axial Rating C0A | 173,000 N | — |
| Axial Load Factors : Y1 | — | 1.49 |
| Axial Load Factors : Y0 | — | 0.82 |
| Da | — | 73.0 mm |
| Db | — | 81.0 mm |
| Ra(Max.) | — | 0.8 mm |
| Rb(Max.) | — | 3.2 mm |
| Mass(Refer.) | — | 0.89 kg |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.