Series 3300 Cone Part Number 3379 Cup Part Number 3320 Design Unit Inch Cage Material Stamped Steel Dimensions d - Bore 1 3/8 in 34.925 mm D - Cup Outer Diameter 3.1562 in 80.167 mm B - Cone Width 1.1965 in 30.391 mm C - Cup Width 0.9375 in 23.813 mm T - Bearing Width 1.1562 in 29.367 mm Abutment and Fillet Dimensions R - Cone Backface "To Clear" Radius1 0.14 in 3.600 mm r - Cup Backface "To Clear" Radius2 0.13 in 3.3 mm da - Cone Frontface Backing Diameter 1.63 in 41.5 mm db - Cone Backface Backing Diameter 1.89 in 48 mm Da - Cup Frontface Backing Diameter 2.99 in 75.90 mm Db - Cup Backface Backing Diameter 2.76 in 70.10 mm Ab - Cage-Cone Frontface Clearance 0.07 in 1.8 mm Aa - Cage-Cone Backface Clearance 0.06 in 1.5 mm a - Effective Center Location3 -0.43 in -10.9 mm Basic Load Ratings C90 - Dynamic Radial Rating (90 million revolutions)4 6700 lbf 29800 N C1 - Dynamic Radial Rating (1 million revolutions)5 25800 lbf 115000 N C0 - Static Radial Rating 29100 lbf 129000 N Ca90 - Dynamic Thrust Rating (90 million revolutions)6 3130 lbf 13900 N Factors K - Factor7 2.14 e - ISO Factor8 0.27 Y - ISO Factor9 2.2 G1 - Heat Generation Factor (Roller-Raceway) 34.6 G2 - Heat Generation Factor (Rib-Roller End) 12.1 Cg - Geometry Factor10 0.0744