Series  78000 Cone Part Number  78251D Cup Part Number  78537 Design Units  Imperial Bearing Weight  9.5000 lb 4.3000 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  5.3750 in 136.525 mm d - Cone Bore  2.5000 in 63.500 mm B - Double Cone Width  2.5980 in 65.989 mm C - Cup Width  0.9260 in 23.520 mm T - Bearing Width across Cups  2.6020 in 66.091 mm Z - Number of Rollers Per Row  16 R - Cone Frontface "To Clear" Radius1  0.090 in 2.30 mm r - Cup Backface "To Clear" Radius2  0.130 in 3.30 mm da - Cone Frontface Backing Diameter  3.11 in 78.90 mm Db - Cup Backface Backing Diameter  4.53 in 115.10 mm Ab - Cage-Cone Frontface Clearance  0.04 in 1.00 mm C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)1  9970 lbf 44300 N C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2  66900 lbf 298000 N C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3  17400 lbf 77200 N Ca90 - Dynamic Thrust Rating (90 million revolutions)4  14800 lbf 65700 N K - Factor1  0.67 e - ISO Factor2  2.6 Y1 - ISO Factor3  0.26 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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