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Technical Specification 
The DSBR 28580/28521 tapered roller bearing is a premium inch-series solution designed to handle heavy radial and axial loads in demanding environments. Commonly used in truck axles, trailers, agricultural equipment, and industrial gearboxes, this bearing is manufactured from high-quality alloy steel and undergoes advanced heat treatment for exceptional wear resistance and long service life. Its cone and cup separable structure simplifies installation, inspection, and replacement. Precision grinding ensures smooth rotation, reduced friction, and higher operational efficiency. As a factory-direct supplier, DSBR guarantees OEM-level quality, competitive pricing, and reliable global delivery, making it a trusted choice for distributors and manufacturers worldwide.
Technical Specification 
| Specifications | |
| Series | 28500 |
| Cone Part Number | 28580 |
| Cup Part Number | 28521 |
| Design Unit | Inch |
| Cage Material | Stamped Steel |
| Related Assembly Number(s) | 28580-90012 |
| Dimensions | |
| d - Bore | 2 in 50.80 mm |
| D - Cup Outer Diameter | 3.6250 in 92.075 mm |
| B - Cone Width | 1.0000 in 25.400 mm |
| C - Cup Width | 0.7813 in 19.845 mm |
| T - Bearing Width | 0.9688 in 24.608 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 | 2.24 in 57 mm |
| db - Cone Backface Backing Diameter | 2.48 in 63 mm |
| Da - Cup Frontface Backing Diameter | 3.46 in 87.88 mm |
| Db - Cup Backface Backing Diameter | 3.27 in 83.06 mm |
| Ab - Cage-Cone Frontface Clearance | 0.06 in 1.5 mm |
| Aa - Cage-Cone Backface Clearance | 0.04 in 1 mm |
| a - Effective Center Location3 | -0.19 in -4.8 mm |
| Basic Load Ratings | |
| C90 - Dynamic Radial Rating (90 million revolutions)4 | 5770 lbf 25700 N |
| C1 - Dynamic Radial Rating (1 million revolutions)5 | 22200 lbf 98900 N |
| C0 - Static Radial Rating | 29200 lbf 130000 N |
| Ca90- Dynamic Thrust Rating (90 million revolutions)6 | 3720 lbf 16600 N |
| Factors | |
| K - Factor7 | 1.55 |
| e - ISO Factor8 | 0.38 |
| Y - ISO Factor9 | 1.59 |
| G1 - Heat Generation Factor (Roller-Raceway) | 46.4 |
| G2 - Heat Generation Factor (Rib-Roller End) | 22.6 |
| Cg - Geometry Factor10 | 0.0912 |
