Overall Thread Shank Size of Length of length length dia. square square L ℓ Ds K ℓk NPSF (for blind hole) Spiral Fluted Taps Hand Taps for American Dryseal Parallel Pipe Threads Specification (for through hole) Spiral Fluted Taps E Oxide NPSF 3/4 ~ Recommended Tapping Speed depending on Materials (for through hole) Spiral Pointed Taps Medium carbon steels 5〜10 For icon explanation, refer to P.50 TYPE:1 TYPE:2 Hand Taps Carbide Taps Cemented Segment:1G Size Class Code Chamfer L ℓ Ds K ℓk No. of Type Roll Taps (inch) (inch) (inch) (inch) (inch) flutes For Dryseal American Pipe Threads Y83326 0.437 0.328 1 Y83326BR NPSF 1/8-27 ANSI G 4P 2.125 0.75 0.375 4 Simple Inspection Tools Pipe Taps Y83327 0.312 0.234 2 Y83327BR Y83328 NPSF 1/4-18 ANSI G 4P 2.437 1.062 0.562 0.421 0.437 4 1 Y83328BR NPSF 3/8-18 ANSI G Y83329 4P 2.562 1.062 0.7 0.531 0.5 4 1 Y83330 NPSF 1/2-14 ANSI G 4P 3.125 1.375 0.687 0.515 0.625 4 2 Y83330BR Y83331 NPSF 3/4-14 ANSI G 4P 3.25 1.375 0.906 0.679 0.687 5 2 Y83331BR Thread Mills Y83332 NPSF 1-11.5 ANSI G 4P 3.75 1.75 1.125 0.843 0.812 5 2 Y83332BR Dies Center Drills Centering Tools ANSI Pipe-10 311