Series  78000 Cone Part Number  78255X Cup Part Number  78549D Design Units  Imperial Bearing Weight  10.6886 lb 4.8483 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  5.5000 in 139.700 mm d - Cone Bore  2.5586 in 64.988 mm B - Cone Width  1.2962 in 32.923 mm C - Double Cup Width  2.0395 in 51.803 mm T - Bearing Width across Cones  3.0625 in 77.788 mm Z - Number of Rollers Per Row  16 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  0.06 in 1.5 mm db - Cone Backface Backing Diameter  3.50 in 88.90 mm Da - Cup Frontface Backing Diameter  5.19 in 131.83 mm Aa - Cage-Cone Backface Clearance  0.27 in 6.90 mm C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)1  11800 lbf 52600 N C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2  79300 lbf 353000 N C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3  20600 lbf 91500 N Ca90 - Dynamic Thrust Rating (90 million revolutions)4  17500 lbf 77900 N K - Factor1  0.67 e - ISO Factor2  2.6 Y1 - ISO Factor3  0.26 0.39 Y2 - ISO Factor4  0.39 G1 - Heat Generation Factor (Roller-Raceway)5  62.6 G2 - Heat Generation Factor (Rib-Roller End)  19.1 Cg - Geometry Factor6  0.0884

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