Series 3900 Cone Part Number 3984 Cup Part Number 3925 Design Unit Inch Cage Material Stamped Steel Dimensions d - Bore 2.6250 in 66.675 mm D - Cup Outer Diameter 4.4375 in 112.713 mm B - Cone Width 1.1830 in 30.048 mm C - Cup Width 0.9375 in 23.813 mm T - Bearing Width 1.1875 in 30.163 mm Abutment and Fillet Dimensions R - Cone Backface "To Clear" Radius1 0.14 in 3.600 mm r - Cup Backface "To Clear" Radius2 0.03 in 0.76 mm da - Cone Frontface Backing Diameter 2.91 in 74 mm db - Cone Backface Backing Diameter 3.15 in 80 mm Da - Cup Frontface Backing Diameter 4.18 in 106.17 mm Db - Cup Backface Backing Diameter 3.98 in 101.09 mm Ab - Cage-Cone Frontface Clearance 0.08 in 2 mm Aa - Cage-Cone Backface Clearance 0.06 in 1.5 mm a - Effective Center Location3 -0.18 in -4.6 mm Basic Load Ratings C90 - Dynamic Radial Rating (90 million revolutions)4 8090 lbf 36000 N C1 - Dynamic Radial Rating (1 million revolutions)5 31200 lbf 139000 N C0 - Static Radial Rating 43000 lbf 191000 N Ca90 - Dynamic Thrust Rating (90 million revolutions)6 5570 lbf 24800 N Factors K - Factor7 1.45 e - ISO Factor8 0.40 Y - ISO Factor9 1.49 G1 - Heat Generation Factor (Roller-Raceway) 75.2 G2 - Heat Generation Factor (Rib-Roller End) 21.3 Cg - Geometry Factor10 0.109