Series  28900 Cone Part Number  28995 Cup Part Number  28921DC Design Units  Imperial Bearing Weight  3.3686 lb 1.5280 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  3.9370 in 100.000 mm d - Cone Bore  2.4700 in 62.738 mm B - Cone Width  1.0000 in 25.400 mm C - Double Cup Width  1.7500 in 44.450 mm T - Bearing Width across Cones  2.1874 in 55.560 mm Z - Number of Rollers Per Row  24 Ka - Locking Pin Diameter  0.5 in 12.7 mm Kb - Locking Pin Depth  0.125 in 3.2 mm R - Cone Backface "To Clear" Radius1  0.140 in 3.600 mm r - Cup Frontface "To Clear" Radius2  0.03 in 0.8 mm db - Cone Backface Backing Diameter  2.95 in 74.90 mm Da - Cup Frontface Backing Diameter  3.82 in 96.01 mm Aa - Cage-Cone Backface Clearance  0.08 in 2.00 mm C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)1  6180 lbf 27500 N C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2  41500 lbf 185000 N C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3  10800 lbf 47900 N Ca90 - Dynamic Thrust Rating (90 million revolutions)4  4500 lbf 20000 N K - Factor1  1.37 e - ISO Factor2  0.93 Y1 - ISO Factor3  0.73 1.09 Y2 - ISO Factor4  1.09 G1 - Heat Generation Factor (Roller-Raceway)5  60.1 G2 - Heat Generation Factor (Rib-Roller End)  24.5 Cg - Geometry Factor6  0.103

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