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| Parameter | TIMKEN385A / 38250.8 × 98.425 × 21 mm | KOYO385X/382A55 × 96.838 × 21.946 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | TIMKEN | KOYO |
| Designation | 385A / 382 | 385X/382A |
| Product family | TS - Tapered Single | Single-row / Inch series |
| Detailed type | Tapered roller bearings | Tapered roller bearings |
| Series | 385 | — |
| Bore diameterd | 50.8 mm | 55 mm |
| Outside diameterD | 98.425 mm | 96.838 mm |
| WidthB | 21 mm | 21.946 mm |
| Basic dynamic load ratingC | 108 kN | 101 kN |
| Basic static load ratingC0 | 107 kN | 101 kN |
| Fatigue load limitPu | — | 15.3 kN |
| Limiting speednG | — | 3900 r/min |
| Mass≈m | 0.73 kg | 0.636 kg |
| Precision class | ABMA Class 2 | — |
| Sealing | Open | — |
| Cage | Steel cage | — |
| Calculation Factors | ||
| K Factor | 1.65 | — |
| Y1 Factor | 1.69 | — |
| Y2 Factor | 0.00 | — |
| Y0 Factor | 0.93 | — |
| E Factor | 0.35 | — |
| Cg Factor | 0.0859 | — |
| 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 | 000000000100126894 | — |
| Official Class Key | — | 050-010-020 |
| World Assembly Part Number | 385A_382 | — |
| Inner Ring Part Number | 385A | — |
| Outer Ring Part Number | 382 | — |
| Drawing Number | A-14181 | — |
| Upc | 0053893262673 | — |
| Official Source System | CORE BP - DS DF | — |
| Official Last Run | 2026-08-23T20:02:47.07 | — |
| Product Identity | ||
| Type Description | TS - Tapered Single | — |
| Construction | Single Row Tapered Roller Bearing Assembly | Imperial Series | 2.0000 in Bore | 3.8750 in OD | 0.8268 in Width | Open | Cylindrical Bore | Steel Cage | Precision ABMA Class 2 | — |
| Number Of Rows | 1 | — |
| Tapered Bore | N | — |
| Technical Data | ||
| d | — | 96.838 mm |
| T | — | 21.000 mm |
| B | — | 21.946 mm |
| C | — | 15.875 mm |
| Overall Width | 25.546 mm | — |
| R(Min.) | — | 3.6 mm |
| Radial Rating | 28,000 N | — |
| R1(Min.) | — | 0.8 mm |
| Axial Rating | 16,900 N | — |
| Basic Load Ratings : Cr | — | 101 kN |
| Dynamic Rating C1 | 108,000 N | — |
| Basic Load Ratings : C0R | — | 101 kN |
| Dynamic Rating C90 | 28,000 N | — |
| Fatigue Load Limit : Cu | — | 15.3 kN |
| Dynamic Axial Rating Ca90 | 16,900 N | — |
| Limiting Speeds(Grease Lub.) | — | 3900 min-1 |
| Dynamic Axial Rating Ca1 | 65,400 N | — |
| Limiting Speeds(Oil Lub.) | — | 5200 min-1 |
| Static Radial Rating C0 | 107,000 N | — |
| Load Center Spread : A | — | 17.4 mm |
| Extended Dynamic Rating Ce | 0 N | — |
| Constant :E | — | 0.35 |
| Static Axial Rating C0A | 111,000 N | — |
| Axial Load Factors : Y1 | — | 1.69 |
| Axial Load Factors : Y0 | — | 0.93 |
| Da | — | 89.0 mm |
| Db | — | 92.0 mm |
| Ra(Max.) | — | 3.6 mm |
| Rb(Max.) | — | 0.8 mm |
| Mass(Refer.) | — | 0.636 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.