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Technical Specification 
The LM503349/LM503310 tapered roller bearing is a precision-engineered inch-series model used in automotive wheel hubs, gearboxes, and industrial machinery. It provides reliable handling of combined loads with reduced friction and wear. Manufactured from high-grade alloy steel with advanced heat treatment, it ensures strength, durability, and long service life. Its separable design allows for easy inspection and replacement. Backed by DSBR’s strict quality assurance and advanced production facilities, this bearing delivers consistent OEM-level performance and cost-effective solutions for global markets.
Technical Specification 
| Specifications | |
| Series | LM503300 |
| Cone Part Number | LM503349 |
| Cup Part Number | LM503310 |
| Design Unit | Inch |
| Cage Material | Stamped Steel |
| Related Assembly Number(s) | LM503349-90402 LM503349-90403 LM503349-90404 LM503349-905A1 LM503349-905A2 |
| Dimensions | |
| d - Bore | 1.8105 in 45.987 mm |
| D - Cup Outer Diameter | 2.9518 in 74.976 mm |
| B - Cone Width | 0.7087 in 18.001 mm |
| C - Cup Width | 0.5512 in 14 mm |
| T - Bearing Width | 0.7087 in 18.001 mm |
| Abutment and Fillet Dimensions | |
| R - Cone Backface "To Clear" Radius1 | 0.09 in 2.290 mm |
| r - Cup Backface "To Clear" Radius2 | 0.06 in 1.52 mm |
| da - Cone Frontface Backing Diameter | 2.01 in 51 mm |
| db - Cone Backface Backing Diameter | 2.17 in 55 mm |
| Da - Cup Frontface Backing Diameter | 2.83 in 71.88 mm |
| Db - Cup Backface Backing Diameter | 2.64 in 67.06 mm |
| Ab - Cage-Cone Frontface Clearance | 0.09 in 2.3 mm |
| Aa - Cage-Cone Backface Clearance | 0.02 in 0.5 mm |
| a - Effective Center Location3 | -0.08 in -2 mm |
| Basic Load Ratings | |
| C90 - Dynamic Radial Rating (90 million revolutions)4 | 3930 lbf 17500 N |
| C1 - Dynamic Radial Rating (1 million revolutions)5 | 15100 lbf 67400 N |
| C0 - Static Radial Rating | 17000 lbf 75400 N |
| Ca90- Dynamic Thrust Rating (90 million revolutions)6 | 2700 lbf 12000 N |
| Factors | |
| K - Factor7 | 1.45 |
| e - ISO Factor8 | 0.4 |
| Y - ISO Factor9 | 1.49 |
| G1 - Heat Generation Factor (Roller-Raceway) | 28.3 |
| G2 - Heat Generation Factor (Rib-Roller End) | 22.5 |
| Cg - Geometry Factor10 | 0.0789 |
