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Technical Specification 
The 25581/25520 tapered roller bearing is a durable inch-series bearing widely used in trucks, agricultural equipment, and industrial applications. Its robust design supports heavy axial and radial loads, ensuring reliability under tough working conditions. Made from high-quality steel with advanced heat treatment, this bearing provides excellent wear resistance and fatigue life. The separable cone and cup simplify maintenance and reduce downtime. With DSBR’s strict quality assurance, this bearing delivers consistent precision and reliability, making it suitable for both OEM installations and aftermarket replacements worldwide.
Technical Specification 
| Specifications | |
| Series | 25500 |
| Cone Part Number | 25581 |
| Cup Part Number | 25520 |
| Design Unit | Inch |
| Cage Material | Stamped Steel |
| Dimensions | |
| d - Bore | 1 3/4 in 44.45 mm |
| D - Cup Outer Diameter | 3.2650 in 82.931 mm |
| B - Cone Width | 1.0000 in 25.400 mm |
| C - Cup Width | 0.7500 in 19.050 mm |
| T - Bearing Width | 0.9375 in 23.813 mm |
| Abutment and Fillet Dimensions | |
| R - Cone Backface "To Clear" Radius1 | 0.02 in 0.50 mm |
| r - Cup Backface "To Clear" Radius2 | 0.030 in0.76 mm |
| da - Cone Frontface Backing Diameter | 1.97 in 50 mm |
| db - Cone Backface Backing Diameter | 2.01 in 51 mm |
| Da - Cup Frontface Backing Diameter | 3.05 in 77.00 mm |
| Db - Cup Backface Backing Diameter | 2.91 in 73.91 mm |
| Ab - Cage-Cone Frontface Clearance | 0.06 in 1.5 mm |
| Aa - Cage-Cone Backface Clearance | 0.01 in 0.3 mm |
| a - Effective Center Location3 | -0.25 in -6.4 mm |
| Basic Load Ratings | |
| C90 - Dynamic Radial Rating (90 million revolutions)4 | 5270 lbf 23500 N |
| C1 - Dynamic Radial Rating (1 million revolutions)5 | 20300 lbf 90500 N |
| C0 - Static Radial Rating | 24900 lbf 111000 N |
| Ca90- Dynamic Thrust Rating (90 million revolutions)6 | 3020 lbf 13500 N |
| Factors | |
| K - Factor7 | 1.74 |
| e - ISO Factor8 | 0.33 |
| Y - ISO Factor9 | 1.79 |
| G1 - Heat Generation Factor (Roller-Raceway) | 35.2 |
| G2 - Heat Generation Factor (Rib-Roller End) | 14.3 |
| Cg - Geometry Factor10 | 0.0801 |
