Series 31500 Cone Part Number 31594 Cup Part Number 31520 Design Unit Inch Cage Material Stamped Steel Dimensions d - Bore 1 3/8 in 34.925 mm D - Cup Outer Diameter 3 in 76.2 mm B - Cone Width 1.1250 in 28.575 mm C - Cup Width 0.9375 in 23.813 mm T - Bearing Width 1.1563 in 29.370 mm Abutment and Fillet Dimensions R - Cone Backface "To Clear" Radius1 0.06 in 1.5 mm r - Cup Backface "To Clear" Radius2 0.13 in 3.3 mm da - Cone Frontface Backing Diameter 1.71 in 43.5 mm db - Cone Backface Backing Diameter 1.81 in 46.0 mm Da - Cup Frontface Backing Diameter 2.87 in 71.90 mm Db - Cup Backface Backing Diameter 2.52 in 64.01 mm Ab - Cage-Cone Frontface Clearance 0.08 in 2 mm Aa - Cage-Cone Backface Clearance 0.04 in 1 mm a - Effective Center Location3 -0.3 in -7.6 mm Basic Load Ratings C90 - Dynamic Radial Rating (90 million revolutions)4 5520 lbf 24600 N C1 - Dynamic Radial Rating (1 million revolutions)5 21300 lbf 94700 N C0 - Static Radial Rating 24100 lbf 107000 N Ca90 - Dynamic Thrust Rating (90 million revolutions)6 3800 lbf 16900 N Factors K - Factor7 1.45 e - ISO Factor8 0.40 Y - ISO Factor9 1.49 G1 - Heat Generation Factor (Roller-Raceway) 26.3 G2 - Heat Generation Factor (Rib-Roller End) 9.08 Cg - Geometry Factor10 0.0773