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Technical Specification 
The DSBR 387A/382A tapered roller bearing is an inch-series bearing ideal for automotive, truck, and heavy-duty industrial machinery applications. With superior heat-treated bearing steel construction, it provides exceptional strength and resistance to wear, even in demanding environments. Its precision-ground raceways minimize friction and enhance operational efficiency. The bearing’s separable cup and cone design allows for easier handling, assembly, and replacement, making it a cost-effective solution for OEMs and distributors. Supported by DSBR’s advanced manufacturing technology, global logistics network, and competitive pricing, this model ensures exceptional reliability for both original equipment and aftermarket applications.
Technical Specification 
| Specifications | |
| Series | 385 |
| Cone Part Number | 387A |
| Cup Part Number | 382A |
| Design Unit | Inch |
| Cage Material | Stamped Steel |
| Related Assembly Number(s) | 387A-90409 |
| Dimensions | |
| d - Bore | 2 1/4 in 57.15 mm |
| D - Cup Outer Diameter | 3.8125 in 96.838 mm |
| B - Cone Width | 0.8640 in 21.946 mm |
| C - Cup Width | 0.6250 in 15.875 mm |
| T - Bearing Width | 0.8268 in 21.001 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 | 2.48 in 63 mm |
| db - Cone Backface Backing Diameter | 2.76 in 70 mm |
| Da - Cup Frontface Backing Diameter | 3.66 in 92.96 mm |
| Db - Cup Backface Backing Diameter | 3.50 in 88.90 mm |
| Ab - Cage-Cone Frontface Clearance | 0.11 in 2.8 mm |
| Aa - Cage-Cone Backface Clearance | 0.03 in 0.8 mm |
| a - Effective Center Location3 | -0.12 in -3 mm |
| Basic Load Ratings | |
| C90 - Dynamic Radial Rating (90 million revolutions)4 | 6280 lbf 28000 N |
| C1 - Dynamic Radial Rating (1 million revolutions)5 | 24200 lbf 108000 N |
| C0 - Static Radial Rating | 24100 lbf 107000 N |
| Ca90- Dynamic Thrust Rating (90 million revolutions)6 | 3810 lbf 16900 N |
| Factors | |
| K - Factor7 | 1.65 |
| e - ISO Factor8 | 0.35 |
| Y - ISO Factor9 | 1.69 |
| G1 - Heat Generation Factor (Roller-Raceway) | 42 |
| G2 - Heat Generation Factor (Rib-Roller End) | 15.7 |
| Cg - Geometry Factor10 | 0.0859 |
