Thread Milling Tools NPT INTERNAL / EXTERNAL ANSI/ASME B 1.20.1-1983 NPT NUT 30 30 90 1 47 NPT SCREW STRAIGHT FLUTES THREAD SIZE PITCH ORDERING L L1 D1 D2 NO. OF TPI CODE FLUTES 1 1/16"-1/8" 27 TMX06059L09 27NPT 57 9.8 6 5.9 3 2 1/4"-3/8" 18 TMX10099L16 18NPT 73 16.2 10 9.9 4 3 1/2" 14 TMX12119L20 14NPT 83 20.8 12 11.9 4 4 1"-2" 11.5 TMX20199L29 11.5NPT 105 29.7 20 19.9 4 5 2 1/2"-6" 8 TMX20199L38 8NPT 105 38.1 20 19.9 4 6 7 8 NPTF 9 INTERNAL / EXTERNAL 10 ANSI B 1.20.3-1976 1N1PTF NUT 30 30 12 13 14 90 1 47 NPTF SCREW 15 STRAIGHT FLUTES 16 17 THREAD SIZE PITCH ORDERING L L1 D1 D2 NO. OFTPICODEFLUTES 18 119 1/16"-1/8" 27 TMX06059L09 27NPTF 57 9.9 6 5.9 3 220 1/4"-3/8" 18 TMX10099L16 18NPTF 73 16.2 10 9.9 4 231 1/2" 14 TMX12119L20 14NPTF 83 20.8 12 11.9 4 242 1"-2" 11.5 TMX20199L29 11.5NPTF 105 29.7 20 19.9 4 5 2 1/2"-6" 8 TMX20199L38 8NPTF 105 38.1 20 19.9 4 6 7 25 8