® Mill - Thread Inserts NPT Conical pipe thread inserts are one-sided and may be used for both External and Internal threading. Pitch Insert Size = A TPI 12 14 21 30 40 18 12-18 NPT 14-18 NPT 14 14-14 NPT 21-14 NPT 11.5 21-11.5 NPT 30-11.5 NPT 40-11.5 NPT 8 30- 8 NPT 40- 8 NPT Order example: 30-11.5 NPT MT7 For conical preparation end mills see page B08-23 NPTF Conical pipe thread inserts are one-sided and may be used for both External and Internal threading. Pitch Insert Size = A TPI 12 14 21 30 40 18 12-18 NPTF 14-18 NPTF 14 14-14 NPTF 21-14 NPTF 11.5 21-11.5 NPTF 30-11.5 NPTF 40-11.5 NPTF 8 30- 8 NPTF 40- 8 NPTF Order example: 21-14 NPTF MT7 For conical preparation end mills see page B08-23 B01-6