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Technical Specification 
The 25580/25520 tapered roller bearing is engineered for heavy-duty applications, such as trucks, agricultural trailers, and construction machinery. It offers high load-bearing capacity for combined axial and radial forces. Produced from high-grade alloy steel and precision-ground raceways, it ensures reduced friction, extended service life, and excellent resistance to fatigue. Its inch-series geometry provides global compatibility for OEM and aftermarket applications. DSBR’s advanced manufacturing and rigorous testing guarantee durability and stable performance, making this bearing a trusted choice in demanding environments.
Technical Specification 
| Specifications | |
| Series | 25500 |
| Cone Part Number | 25580 |
| Cup Part Number | 25520 |
| Design Unit | Inch |
| Cage Material | Stamped Steel |
| Related Assembly Number(s) | 25580-90018 25580-902A3 25580-906A1 |
| 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 | 0.14 in 3.600 mm |
| r - Cup Backface "To Clear" Radius2 | 0.030 in 0.76 mm |
| da - Cone Frontface Backing Diameter | 1.97 in 50 mm |
| db - Cone Backface Backing Diameter | 2.24 in 57 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 |
