Series  28900 Cone Part Number  28980 Cup Part Number  28921 Design Units  Imperial Bearing Weight  1.7000 lb 0.8000 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  3.9370 in 100.000 mm d - Cone Bore  2.3613 in 59.977 mm B - Cone Width  1.0000 in 25.400 mm C - Cup Width  0.7813 in 19.845 mm T - Bearing Width  1.0000 in 25.400 mm Z - Number of Rollers Per Row  24 R - Cone Backface "To Clear" Radius1  0.140 in 3.560 mm r - Cup Backface "To Clear" Radius2  0.130 in 3.30 mm da - Cone Frontface Backing Diameter  2.64 in 67.06 mm db - Cone Backface Backing Diameter  2.87 in 72.90 mm Da - Cup Frontface Backing Diameter  3.82 in 97.00 mm Db - Cup Backface Backing Diameter  3.50 in 88.90 mm Ab - Cage-Cone Frontface Clearance  0.05 in 1.27 mm Aa - Cage-Cone Backface Clearance  0.08 in 2.03 mm a - Effective Center Location3  -0.10 in -2.50 mm C90 - Dynamic Radial Rating (90 million revolutions)1  6180 lbf 27500 N C1 - Dynamic Radial Rating (1 million revolutions)2  23800 lbf 106000 N C0 - Static Radial Rating  33500 lbf 149000 N Ca90 - Dynamic Thrust Rating (90 million revolutions)3  4500 lbf 20000 N K - Factor1  1.37 e - ISO Factor2  0.43 Y - ISO Factor3  1.41 G1 - Heat Generation Factor (Roller-Raceway)  60.1 G2 - Heat Generation Factor (Rib-Roller End)  24.5 Cg - Geometry Factor  0.103

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