Series  28800 Cone Part Number  K28880 Cup Part Number  K28820 Design Units  Imperial Bearing Weight  7.0000 lb 3.2000 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  12.0000 in 304.800 mm d - Cone Bore  9.7500 in 247.650 mm B - Cone Width  0.8750 in 22.225 mm C - Cup Width  0.6250 in 15.875 mm T - Bearing Width  0.8750 in 22.225 mm Z - Number of Rollers Per Row  70 R - Cone Backface "To Clear" Radius1  0.060 in 1.520 mm r - Cup Backface "To Clear" Radius2  0.060 in 1.52 mm da - Cone Frontface Backing Diameter  11.26 in 256.03 mm db - Cone Backface Backing Diameter  10.16 in 258.06 mm Da - Cup Frontface Backing Diameter  11.69 in 296.93 mm Db - Cup Backface Backing Diameter  11.46 in 291.08 mm Ab - Cage-Cone Frontface Clearance  0.07 in 1.78 mm Aa - Cage-Cone Backface Clearance  0.07 in 1.78 mm a - Effective Center Location3  0.68 in 17.30 mm C90 - Dynamic Radial Rating (90 million revolutions)1  9170 lbf 40800 N C1 - Dynamic Radial Rating (1 million revolutions)2  35400 lbf 157000 N C0 - Static Radial Rating  83900 lbf 373000 N Ca90 - Dynamic Thrust Rating (90 million revolutions)3  5100 lbf 22700 N K - Factor1  1.8 e - ISO Factor2  0.32 Y - ISO Factor3  1.85 G1 - Heat Generation Factor (Roller-Raceway)  807 G2 - Heat Generation Factor (Rib-Roller End)  572.7 Cg - Geometry Factor  0.148

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