Series  385 Cone Part Number  387A Cup Part Number  384D Design Units  Imperial Bearing Weight  3.2986 lb 1.4962 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  3.9370 in 100.000 mm d - Cone Bore  2.2500 in 57.150 mm B - Cone Width  0.8640 in 21.946 mm C - Double Cup Width  1.6875 in 42.863 mm T - Bearing Width across Cones  2.0624 in 52.385 mm Z - Number of Rollers Per Row  19 Ka - Locking Pin Diameter  N/A Kb - Locking Pin Depth  N/A 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  2.76 in 70.10 mm Da - Cup Frontface Backing Diameter  3.68 in 93.47 mm Aa - Cage-Cone Backface Clearance  0.04 in 1.00 mm C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)1  6280 lbf 28000 N C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2  42200 lbf 188000 N C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3  10900 lbf 48700 N Ca90 - Dynamic Thrust Rating (90 million revolutions)4  3810 lbf 16900 N K - Factor1  1.65 e - ISO Factor2  0.75 Y1 - ISO Factor3  0.90 1.34 Y2 - ISO Factor4  1.34 G1 - Heat Generation Factor (Roller-Raceway)5  42 G2 - Heat Generation Factor (Rib-Roller End)  15.7 Cg - Geometry Factor6  0.0859

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