Series  555 Cone Part Number  559 Cup Part Number  552D Design Units  Imperial Bearing Weight  8.9132 lb 4.0430 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  4.8750 in 123.825 mm d - Cone Bore  2.5000 in 63.500 mm B - Cone Width  1.4440 in 36.678 mm C - Double Cup Width  2.5000 in 63.500 mm T - Bearing Width across Cones  3.1249 in 79.372 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  0.06 in 1.5 mm db - Cone Backface Backing Diameter  3.19 in 81.00 mm Da - Cup Frontface Backing Diameter  4.56 in 115.82 mm Aa - Cage-Cone Backface Clearance  0.09 in 2.30 mm C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)1  13200 lbf 58600 N C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2  88500 lbf 394000 N C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3  22900 lbf 102000 N Ca90 - Dynamic Thrust Rating (90 million revolutions)4  7810 lbf 34700 N K - Factor1  1.69 e - ISO Factor2  0.73 Y1 - ISO Factor3  0.92 1.37 Y2 - ISO Factor4  1.37 G1 - Heat Generation Factor (Roller-Raceway)5  91 G2 - Heat Generation Factor (Rib-Roller End)  21.1 Cg - Geometry Factor6  0.111

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