Series 6500 Cone Part Number 6580 Cup Part Number 6520 Design Unit Inch Cage Material Stamped Steel Dimensions d - Bore 3 1/2 in 88.900 mm D - Cup Outer Diameter 6.6870 in 169.850 mm B - Cone Width 2.1693 in 55.100 mm C - Cup Width 1.7500 in 44.450 mm T - Bearing Width 2.1250 in 53.975 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 4.02 in 102 mm db - Cone Backface Backing Diameter 4.61 in 117.0 mm Da - Cup Frontface Backing Diameter 6.14 in 155.96 mm Db - Cup Backface Backing Diameter 5.71 in 145.03 mm Ab - Cage-Cone Frontface Clearance 0.06 in 1.5 mm Aa - Cage-Cone Backface Clearance 0.15 in 3.8 mm a - Effective Center Location3 -0.52 in -13.2 mm Basic Load Ratings C90 - Dynamic Radial Rating (90 million revolutions)4 25600 lbf 114000 N C1 - Dynamic Radial Rating (1 million revolutions)5 98800 lbf 439000 N C0 - Static Radial Rating 118000 lbf 523000 N Ca90 - Dynamic Thrust Rating (90 million revolutions)6 17600 lbf 78100 N Factors K - Factor7 1.46 e - ISO Factor8 0.40 Y - ISO Factor9 1.5 G1 - Heat Generation Factor (Roller-Raceway) 199 G2 - Heat Generation Factor (Rib-Roller End) 33.5 Cg - Geometry Factor10 0.1040