387A/382A Inch Tapered Roller Bearings
Provide Professional High-quality Bearings for Over 70 Countries
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.

| 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 |
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