122978/122125TimkenTapered Roller
122978/122125 is a Timken tapered roller bearing, bore 199.97 mm, O.D. 317.5 mm, width 4.3 mm. Dimensions, drawing, interchanges and price.
Original catalogue drawing - Timken - Single Row
Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.
Scale cross-section
Blue = inner / outer ring, yellow = rolling element. Drawn to scale from this part's own dimensions for selection reference only - not a manufacturing or assembly drawing.
Dimension table (mm / inch)
| Symbol | Dimension | mm | inch |
|---|---|---|---|
| d | Bore diameter | 199.974 | 7.873 |
| D | Outside diameter | 317.5 | 12.5 |
| B | Inner-ring / bearing width | 4.3 | 0.1693 |
| T | Overall assembly width | 66.675 | 2.625 |
| C | Cup / outer-ring width | 50.8 | 2 |
| r | Chamfer (min) | 3.3 | 0.1299 |
Notes
Tapered roller bearings are cone / cup assemblies; cone and cup weights are listed separately and the total is their sum. Weights are given in kg. Load ratings are shown in both the original catalogue units and the converted value (1 N = 0.2248 lbf). Data is provided for selection reference only - confirm against the latest official catalogue before ordering.
Main dimensions
| Bore d (mm) | 199.974 |
|---|---|
| Bore d (in) | 7.8730 |
| Outside dia. D (mm) | 317.500 |
| Outside dia. D (in) | 12.5000 |
| Width B (mm) | 4.3 |
| Width B (in) | 2.7559 |
| Overall width T (mm) | 66.675 |
| Overall width T (in) | 2.6250 |
| Cup width C (mm) | 50.800 |
| Cup width C (in) | 2.0000 |
Weight
| Cone weight (kg) | 12.78 |
|---|---|
| Cup weight (kg) | 5.69 |
| Total weight (kg) | 18.47 |
Mounting dimensions (fillets / shoulders)
| Shaft fillet R max (mm) | 12.78 |
|---|---|
| Housing fillet r max (mm) | 3.3 |
Source & traceability
| Brand | Timken |
|---|---|
| Source catalogue | Timken Bearing Dimension Catalog |
| Catalogue page | p.322 (dimensions) / p.122 (cone) / p.122 (cup) |
Dimensions and component weights only - this catalogue publishes no load ratings or speeds.
Nearby bore sizes
| Designation | Brand | Type | d | D | B/T | Dyn. rating | kg |
|---|---|---|---|---|---|---|---|
| 93788D/93125 | Timken | Tapered Roller | 199.97 | 317.5 | 133.35 | 1270 kN | 40.08 |
| 67982/67919 | Timken | Tapered Roller | 199.95 | 279.4 | 3.5 | - | 8.9 |
| 30240 | Timken | Tapered Roller | 200 | 360 | 58 | 891 kN | 25.67 |
| 32040X | Timken | Tapered Roller | 200 | 310 | 70 | 847 kN | 18.68 |
| 32240 | Timken | Tapered Roller | 200 | 360 | 98 | 1390 kN | 42.51 |
| 32940 | Timken | Tapered Roller | 200 | 280 | 51 | 530 kN | 9.45 |
| JHM840449/JHM840410 | Timken | Tapered Roller | 200 | 300 | 62 | 695 kN | 15.32 |
| L540048/L540010 | Timken | Tapered Roller | 200 | 254 | 1.5 | - | 3.17 |
Request a quotation for 122978/122125
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