Timken 78250 Tapered Roller Bearing 2.5″ Bore x 1.3085″ Wide
Specifications:
Condition: New
Brand: Timken
Model: 78250
MPN: none
Series: | Revision: | Firmware:
Description: Tapered Roller Bearing
Capacity: 2.5″ Bore x 1.3085″ Wide
Origin: USA
UPC: 053893401713
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Additional MFG Notes on Timken 78250 Tapered Roller Bearing 2.5″ Bore x 1.3085″ Wide:
Specifications
Series: 78000
Cone Part Number: 78250
Design Units: Imperial
Cage Type: Stamped Steel
C1 – Dynamic Radial Rating (Two-Row, 1 million revolutions)1: 79300 lbf 353000 N
C90(2) – Dynamic Radial Rating (Two-Row, 90 million revolutions)2: 20600 lbf 91500 N
Dimensions
d – Cone Bore: 2.5000 in 63.500 mm
B – Cone Width: 1.3085 in 33.236 mm
Abutment and Fillet Dimensions
R – Cone Backface “To Clear” Radius3: 0.090 in 2.30 mm
da – Cone Frontface Backing Diameter: 3.1 in 79 mm
db – Cone Backface Backing Diameter: 3.35 in 85 mm
Ab – Cage-Cone Frontface Clearance: 0.2 in 5.1 mm
Aa – Cage-Cone Backface Clearance: 0.24 in 6.1 mm
a – Effective Center Location4: 0.31 in 7.9 mm
Basic Load Ratings
C90 – Dynamic Radial Rating (90 million revolutions)5: 11800 lbf 52600 N
C1 – Dynamic Radial Rating (1 million revolutions)6: 45600 lbf 203000 N
C0 – Static Radial Rating: 43400 lbf 193000 N
Ca90 – Dynamic Thrust Rating (90 million revolutions)7: 17500 lbf 77900 N
Factors
K – Factor8: 0.67
G1 – Heat Generation Factor (Roller-Raceway): 62.6
G2 – Heat Generation Factor (Rib-Roller End): 19.1
Cg – Geometry Factor9: 0.0884
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 for a single-row, C90(2) is the two-row radial value.
3 These maximum fillet radii will be cleared by the bearing corners.
4 Negative value indicates effective center inside cone backface.
5 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
6 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
7 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.
8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
9 Geometry constant for Lubrication Life Adjustment Factor a3l.
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