ShaftDianeter Breaing Designation Mass Boundary Dinmensions Approx d F B mm g mm 5 IR5 x 8 x 12 2.79 5 8 12 IR5 x 8 x 16 3.75 5 8 16 8 □IR8 x 12 x 10 4.8 8 12 10 IR/LR8 x 12 x 10.5 5 8 12 10.5 ■IR8 x 12 x 12 5.7 8 12 12 IR/LR8 x 12 x 12.5 5.9 8 12 12.5 22 IR22 x 26 x 16 17.5 22 26 16 IR22 x 28 x 17 29.8 22 28 17 IR/LR22 x 28 x 20.5 36 22 28 20.5 IR22 x 28 x30 26.7 22 28 30 28 IR28 x 32 x 17 24.5 28 32 17 IR28 x 32 x 30 43.8 28 32 30 29 IR29 x 32 x 13 14.8 29 32 13 55 IR55 x 63 x 25 86 55 63 25 80 IR80 x 90 x 35 355 80 90 35