Series  28900 Cone Part Number  28990 Cup Part Number  28919 Design Units  Imperial Bearing Weight  1.6000 lb 0.7000 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  3.9362 in 99.979 mm d - Cone Bore  2.4400 in 61.976 mm B - Cone Width  0.9688 in 24.608 mm C - Cup Width  0.7500 in 19.050 mm T - Bearing Width  0.9375 in 23.813 mm Z - Number of Rollers Per Row  24 R - Cone Backface "To Clear" Radius1  0.080 in 2.030 mm r - Cup Backface "To Clear" Radius2  0.060 in 1.52 mm da - Cone Frontface Backing Diameter  2.68 in 68.07 mm db - Cone Backface Backing Diameter  2.83 in 71.88 mm Da - Cup Frontface Backing Diameter  3.82 in 97.00 mm Db - Cup Backface Backing Diameter  3.54 in 89.92 mm Ab - Cage-Cone Frontface Clearance  0.05 in 1.27 mm Aa - Cage-Cone Backface Clearance  0.05 in 1.27 mm a - Effective Center Location3  -0.07 in -1.80 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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