Series  1200 Cone Part Number  1280 Cup Part Number  1220 Design Units  Imperial Bearing Weight  0.6000 lb 0.3000 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  2.2500 in 57.150 mm d - Cone Bore  0.8750 in 22.225 mm B - Cone Width  0.8750 in 22.225 mm C - Cup Width  0.6875 in 17.463 mm T - Bearing Width  0.8750 in 22.225 mm Z - Number of Rollers Per Row  13 R - Cone Backface "To Clear" Radius1  0.030 in 0.760 mm r - Cup Backface "To Clear" Radius2  0.060 in 1.52 mm da - Cone Frontface Backing Diameter  1.14 in 28.96 mm db - Cone Backface Backing Diameter  1.16 in 29.46 mm Da - Cup Frontface Backing Diameter  2.07 in 52.10 mm Db - Cup Backface Backing Diameter  1.93 in 49.02 mm Ab - Cage-Cone Frontface Clearance  0 in 0.00 mm Aa - Cage-Cone Backface Clearance  0.00 in 0.00 mm a - Effective Center Location3  -0.27 in -6.90 mm C90 - Dynamic Radial Rating (90 million revolutions)1  3230 lbf 14300 N C1 - Dynamic Radial Rating (1 million revolutions)2  12400 lbf 55300 N C0 - Static Radial Rating  12400 lbf 55100 N Ca90 - Dynamic Thrust Rating (90 million revolutions)3  1910 lbf 8510 N K - Factor1  1.69 e - ISO Factor2  0.35 Y - ISO Factor3  1.73 G1 - Heat Generation Factor (Roller-Raceway)  11.4 G2 - Heat Generation Factor (Rib-Roller End)  5.52

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