Overall Thread Position on Shank Size of Length of length length basic dia. dia. square square L ℓ ℓg Ds K ℓk LS-NPT (for blind hole) Spiral Fluted Taps Long Shank Hand Taps for American Taper Pipe Threads Specification (for through hole) Spiral Fluted Taps E NPT 3/4 ~ Recommended Tapping Speeds depending on Materials (for through hole) Spiral Pointed Taps Medium carbon steels 〜5 For icon explanation, refer to P.50 Hand Taps TYPE:1 TYPE:2 g g Carbide Taps Cemented Segment:1G Roll Taps Basic L ℓ ℓg Ds K ℓk No. of Size Class Code Chamfer major dia (mm) (mm) (mm) (mm) (mm) (mm) flutes Type Stock (mm) For American Pipe Threads NPT 1/16-27 ANSI G TNPT01LL10 3P 7.770 100 17 12 8 6 9 4 1 △ TNPT02LL10 100 Simple Inspection Tools Special Thread Taps NPT 1/8-27 ANSI G 3P 10.117 19 12.05 8 6 9 4 2 △ TNPT02LL15 150 TNPT04OL10 100 NPT 1/4-18 ANSI G 3P 13.426 28 17.45 11 9 12 4 2 △ TNPT04OL15 150 TNPT06OL10 100 Pipe Taps NPT 3/8-18 ANSI G 3P 16.866 28 17.65 14 11 14 4 2 △ TNPT06OL15 150 NPT 1/2-14 ANSI G TNPT08QL15 3P 20.980 150 35 22.85 18 14 17 4 2 △ NPT 3/4-14 ANSI G TNPT12QL15 3P 26.325 150 35 22.95 23 17 20 4 2 △ NPT 1 -11.5 ANSI G TNPT16TL15 3P 32.934 150 45 27.4 26 21 24 5 2 △ Thread Mills Dies Center Drills Centering Tools JIS ◎=Standard ○=Semi standard △=Made to order Pipe-44 For improvement, spec may change without advance notice. 593