This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.
Unit of Measure
Key Dimensions
Cone Part Number |
N/A 1178X |
Bore (d) |
N/A 5/8 in15.875 mm |
Inner Ring Width (B) |
N/A 0.8880 in22.555 mm |
| Dynamic Radial Load Rating - 1M Revs (C1) 1 | N/A 8320 lbf37000 N |
| Dynamic Radial Load Rating - 90M Revs (C90) 2 | N/A 2160 lbf9590 N |
| e Factor 3 | N/A 0.25 |
| K Factor 4 | N/A 2.37 |
| Y Factor 5 | N/A 2.43 |
Other Dimensions
Weight |
N/A 0.4 lb0.20 Kg |
| Effective Center Location6 | N/A -0.43 in-10.9 mm |
| Max Shaft Fillet Radius7 | N/A 0.06 in1.520 mm |
Shaft Backing Shoulder Diameter - Frontface (da) |
N/A 0.83 in21 mm |
Shaft Backing Shoulder Diameter - Backface (db) |
N/A 0.91 in23 mm |
Cage Location rel. to BF (Aa) |
N/A 0 in0 mm |
Cage Location rel. to FF (Ab) |
N/A 0 in0 mm |
- 1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
- 2 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
- 3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
- 4 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
- 5 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
- 6 Negative value indicates effective center inside cone backface.
- 7 These maximum fillet radii will be cleared by the bearing corners.
- 8 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values for a single-row, C90(2) is the two-row radial value.
- 9 Geometry constant for Lubrication Life Adjustment Factor a3l.