Overall Thread Position on Shank Size of Length of length length basic dia. dia. square square L ℓ ℓg Ds K ℓk LS-SP-S-NPT (for blind hole) Spiral Fluted Taps Long Shank Spiral Fluted Taps for American Taper Pipe Threads, Short (ℓg) Type Specification (for through hole) Spiral Fluted Taps E NPT 3/4 ~ Recommended Tapping Speeds depending on Materials (for through hole) Spiral Pointed Taps ow carbon steels TYPE:1 〜5 For icon explanation, refer to P.50 Hand Taps g Segment:1G Carbide Taps Cemented 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 1/8-27 ANSI G SSNPT02LL10 2.5P 10.117 100 16.5 10.5 8 6 9 3 1 △ NPT 1/4-18 ANSI G SSNPT04OL15 2.5P 13.426 150 19.5 12.5 11 9 12 3 1 △ Roll Taps NPT 3/8-18 ANSI G SSNPT06OL15 2.5P 16.866 150 21 14 14 11 14 3 1 △ NPT 1/2-14 ANSI G SSNPT08QL15 2.5P 20.980 150 27 17 18 14 17 4 1 △ NPT 3/4-14 ANSI G SSNPT12QL15 2.5P 26.325 150 29 19 23 17 20 4 1 △ Simple Inspection Tools Special Thread Taps Pipe Taps Thread Mills Dies Center Drills Centering Tools JIS ◎=Standard ○=Semi standard △=Made to order Pipe-46 For improvement, spec may change without advance notice. 595