Series  12500 Cone Part Number  12580 Cup Part Number  12520 Design Units  Imperial Bearing Weight  0.4000 lb 0.2000 Kg Cage Type  Stamped Steel D - Cup Outer Diameter  1.9380 in 49.225 mm d - Cone Bore  0.8125 in 20.638 mm B - Cone Width  0.7813 in 19.845 mm C - Cup Width  0.6250 in 15.875 mm T - Bearing Width  0.7813 in 19.845 mm Z - Number of Rollers Per Row  13 R - Cone Backface "To Clear" Radius1  0.060 in 1.520 mm r - Cup Backface "To Clear" Radius2  0.060 in 1.52 mm da - Cone Frontface Backing Diameter  1.02 in 25.91 mm db - Cone Backface Backing Diameter  1.12 in 28.45 mm Da - Cup Frontface Backing Diameter  1.81 in 45.97 mm Db - Cup Backface Backing Diameter  1.67 in 42.42 mm Ab - Cage-Cone Frontface Clearance  0.05 in 1.27 mm Aa - Cage-Cone Backface Clearance  0.04 in 1.02 mm a - Effective Center Location3  -0.28 in -7.10 mm C90 - Dynamic Radial Rating (90 million revolutions)1  2540 lbf 11300 N C1 - Dynamic Radial Rating (1 million revolutions)2  9810 lbf 43600 N C0 - Static Radial Rating  9720 lbf 43200 N Ca90 - Dynamic Thrust Rating (90 million revolutions)3  1410 lbf 6260 N K - Factor1  1.81 e - ISO Factor2  0.32 Y - ISO Factor3  1.86 G1 - Heat Generation Factor (Roller-Raceway)  8.6 G2 - Heat Generation Factor (Rib-Roller End)  6.21

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