Series  31307 Cone Part Number  X31307 Cup Part Number  Y31307 Design Units  Metric Bearing Weight  1.2000 Kg 0.5000 lb Cage Type  Stamped Steel D - Cup Outer Diameter  3.1496 in 80.000 mm d - Cone Bore  1.3780 in 35.000 mm B - Cone Width  0.8268 in 21.000 mm C - Cup Width  0.5906 in 15.000 mm T - Bearing Width  0.8957 in 22.750 mm Z - Number of Rollers Per Row  15 R - Cone Backface "To Clear" Radius1  0.080 in 2.030 mm r - Cup Backface "To Clear" Radius2  0.060 in 1.52 mm da - Cone Frontface Backing Diameter  1.77 in 44.96 mm db - Cone Backface Backing Diameter  2.20 in 55.88 mm Da - Cup Frontface Backing Diameter  3.03 in 76.96 mm Db - Cup Backface Backing Diameter  2.68 in 68.07 mm Ab - Cage-Cone Frontface Clearance  0.13 in 3.30 mm Aa - Cage-Cone Backface Clearance  0.13 in 3.30 mm a - Effective Center Location3  0.13 in 3.30 mm C90 - Dynamic Radial Rating (90 million revolutions)1  5030 lbf 22400 N C1 - Dynamic Radial Rating (1 million revolutions)2  19400 lbf 86300 N C0 - Static Radial Rating  16800 lbf 74800 N Ca90 - Dynamic Thrust Rating (90 million revolutions)3  7110 lbf 31600 N K - Factor1  0.71 e - ISO Factor2  0.83 Y - ISO Factor3  0.73 G1 - Heat Generation Factor (Roller-Raceway)  17.8 G2 - Heat Generation Factor (Rib-Roller End)  8.7 Cg - Geometry Factor  0.0839

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