... mm (0.3 7-0 . 75 in.) diameter 2 0-6 5 5- 1 7 1 9-3 2 mm (0.7 5- 1 . 25 in.) diameter 4 0-1 50 1 0-4 0 3 2-3 8 mm (1.2 5- 1 .50 in.) diameter 6 4-1 90 1 7 -5 0 Internal chip removal type 7. 9-9 .4 mm (0.3 1-0 .37 in.) ... 13 45, 4042, 4047, 4140, 4142, 41 45, 4147, 4340, 50 B40, 50 B44, 50 46, 50 B46, 51 40, 51 45, 51 47, 81B 45, 8640, 8642, 86 45, 86B 45, 8740, 8742 17 5- 2 25 Hot rolled, annealed, or cold drawn 16 0.6 25 ... 16 0.6 25 15 50 0. 75 0.030 S4, S5 M2, M3 High-strength steels, wrought 1 0.040 26 85 0.18 0.007 S4, S5 M2, M3 4 0. 150 20 65 0.40 0.0 15 S4, S5 M2, M3 8 0.300 15 50 0 .50 0.020...