® Thread Turning Technical Section Conversion of Cutting Speed to Rotational Speed Conversion of a selected cutting speed to rotational speed is calculated by thefollowing formula: 30 mm 1000 120 1000 1274 30 V=120 m/min Number of passes and depth of cut per pass for multitooth insert Pitchmm Insert Size No. ofLI.C. (in)TeethOrdering CodeNo. of Depth of Cut per passPasses1234 1.00 16 3/8 3 16 ER 1.0 ISO 3M 2 0.38 0.25 1.50 16 3/8 2 16 ER 1.5 ISO 2M 3 0.42 0.30 0.20 ISO 1.50 22 1/2 3 22 ER 1.5 ISO 3M 2 0.55 0.37 External 2.00 22 1/2 2 22 ER 2.0 ISO 2M 3 0.57 0.40 0.28 2.00 22 1/2 3 22 ER 2.0 ISO 3M 2 0.76 0.49 3.00 27 5/8 2 27 ER 3.0 ISO 2M 4 0.59 0.51 0.42 0.32 1.00 16 3/8 3 16 IR 1.0 ISO 3M 2 0.33 0.25 1.50 16 3/8 2 16 IR 1.5 ISO 2M 3 0.38 0.29 0.20 ISO 1.50 22 1/2 3 22 IR 1.5 ISO 3M 2 0.50 0.37 Internal 2.00 22 1/2 2 22 IR 2.0 ISO 2M 3 0.52 0.37 0.26 2.00 22 1/2 3 22 IR 2.0 ISO 3M 2 0.70 0.45 3.00 27 5/8 2 27 IR 3.0 ISO 2M 4 0.58 0.46 0.39 0.30 16 16 3/8 2 16 ER 16 UN 2M 3 0.44 0.31 0.22 16 22 1/2 3 22 ER 16 UN 3M 2 0.58 0.39 UN 12 22 1/2 2 22 ER 12 UN 2M 3 0.59 0.42 0.30 External 12 22 1/2 3 22 ER 12 UN 3M 2 0.78 0.52 8 27 5/8 2 27 ER 8 UN 2M 4 0.62 0.54 0.45 0.35 16 16 3/8 2 16 IR 16 UN 2M 3 0.42 0.28 0.22 UNInternal 161212 22 1/2 3 22 IR 16 UN 3M 2 0.55 0.37221/2222 IR12UN2M30.530.380.31221/2322 IR12UN3M20.740.48 8 27 5/8 2 27 IR 8 UN 2M 4 0.63 0.50 0.40 0.30 Whitworth 14 16 3/8 2 16 ER 14 W 2M 3 0.52 0.37 0.27 55° 14 22 1/2 3 22 ER 14 W 3M 2 0.70 0.46 External 11 22 1/2 2 22 ER 11 W 2M 3 0.67 0.47 0.34 Whitworth 14 16 3/8 2 16 IR 14 W 2M 3 0.52 0.37 0.27 55° 14 22 1/2 3 22 IR 14 W 3M 2 0.70 0.46 Internal 11 22 1/2 2 22 IR 11 W 2M 2 0.67 0.47 0.34 14 16 3/8 2 16 ER 14 NPT 2M 3 NPT 11.5 22 1/2 2 22 ER 11.5 NPT 2M 4 0.54 0.47 0.37 0.30 External 11.5 27 5/8 3 27 ER 11.5 NPT 3M 4 0.76 0.54 0.38 8 27 5/8 2 27 ER 8 NPT 2M 4 0.81 0.60 0.55 0.45 14 16 3/8 2 16 IR 14 NPT 2M 3 NPT 11.5 22 1/2 2 22 IR 11.5 NPT 2M 4 0.54 0.47 0.37 0.30 Internal 11.5 27 5/8 3 27 IR 11.5 NPT 3M 4 0.76 0.54 0.38 8 27 5/8 2 27 IR 8 NPT 2M 4 0.81 0.60 0.55 0.45 API RoundExternal10108 22 1/2 2 22 ER 10 APIRD 2M 3 0.60 0.50 0.31275/8327 ER 10 APIRD 3M21.000.41275/8227 ER8 APIRD 2M30.800.600.41 API RoundInternal10108 22 1/2 2 22 IR 10 APIRD 2M 3 0.60 0.50 0.31275/8327 IR 10 APIRD 3M21.000.41275/8227 IR8 APIRD 2M30.800.600.41 A04-4