Thread Milling Tools NPTF INTERNAL / EXTERNAL ANSI B 1.20.3-1976 NPTF NUT 30 30 90 1 47 NPTF SCREW HELICAL FLUTES THREAD PITCH ORDERING L L1 D1 D2 NO. OF SIZE TPI CODE FLUTES 1 1/16" 27 TMG06059L09 27NPTF 57 9.9 6 5.9 3 2 1/8" 27 TMG08077L10 27NPTF 63 10.8 8 7.7 3 3 1/4"-3/8" 18 TMG10099L16 18NPTF 73 16.2 10 9.9 4 4 1/2" 14 TMG12119L20 14NPTF 84 20.8 12 11.9 4 5 1"-2" 11.5 TMG20199L29 11.5NPTF 105 29.7 20 19.9 4 6 2 1/2"-6" 8 TMG20199L38 8NPTF 105 38.1 20 19.9 4 HELICAL FLUTES WITH COOLANT HOLE THREAD PITCH ORDERING L L1 D1 D2 NO. OF SIZE TPI CODE FLUTES 1 1/16" 27 TMGB06059L09 27NPTF 57 9.9 6 5.9 3 2 1/8" 27 TMGB08077L10 27NPTF 63 10.8 8 7.7 3 3 1/4"-3/8" 18 TMGB10099L16 18NPTF 73 16.2 10 9.9 4 4 1/2" 14 TMGB12119L20 14NPTF 84 20.8 12 11.9 4 5 1"-2" 11.5 TMGB20199L29 11.5NPTF 105 29.7 20 19.9 4 6 2 1/2"-6" 8 TMGB20199L38 8NPTF 105 38.1 20 19.9 4 10