Series  3900 Cone Part Number  3977X Cup Part Number  3921XA Design Units  Imperial Bearing Weight  2.7000 lb 1.2000 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  4.3301 in 109.985 mm d - Cone Bore  2.3617 in 59.987 mm B - Cone Width  1.1024 in 28.001 mm C - Cup Width  0.9375 in 23.813 mm T - Bearing Width  1.1713 in 29.751 mm Z - Number of Rollers Per Row  22 R - Cone Backface "To Clear" Radius1  0.090 in 2.290 mm r - Cup Backface "To Clear" Radius2  0.020 in 0.51 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  4.13 in 104.90 mm Db - Cup Backface Backing Diameter  3.94 in 100.08 mm Ab - Cage-Cone Frontface Clearance  0.12 in 3.05 mm Aa - Cage-Cone Backface Clearance  0.09 in 2.29 mm a - Effective Center Location3  -0.18 in -4.60 mm C90 - Dynamic Radial Rating (90 million revolutions)1  8090 lbf 36000 N C1 - Dynamic Radial Rating (1 million revolutions)2  31200 lbf 139000 N C0 - Static Radial Rating  43000 lbf 191000 N Ca90 - Dynamic Thrust Rating (90 million revolutions)3  5570 lbf 24800 N K - Factor1  1.45 e - ISO Factor2  0.4 Y - ISO Factor3  1.49 G1 - Heat Generation Factor (Roller-Raceway)  75.2 G2 - Heat Generation Factor (Rib-Roller End)  21.3 Cg - Geometry Factor  0.109

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