Pipe Tap Overall Thread Shank Size of Length of length length dia. square square L ℓ Ds K ℓk Spiral Fluted Taps (for blind hole) NPS Hand Taps for American Parallel Pipe Threads Spiral Fluted Taps (for through hole) Specification E Oxide NPS 3/4 ~ Spiral Pointed Taps (for through hole) Recommended Tapping Speed depending on Materials Medium carbon steels 5〜10 For icon explanation, refer to P.50 Hand Taps TYPE:1 TYPE:2 Cemented Carbide Taps Segment:1G Roll Taps Size Class Code Chamfer L ℓ Ds K ℓk No. of Type (inch) (inch) (inch) (inch) (inch) flutes For American Pipe Threads Y83301 0.437 0.328 1 Y83301BR Pipe Taps Simple Inspection Tools NPS 1/8-27 ANSI G 4P 2.125 0.75 0.375 4 Y83302 0.312 0.234 2 Y83302BR Y83303 NPS 1/4-18 ANSI G 4P 2.437 1.062 0.562 0.421 0.437 4 1 Y83303BR Y83304 NPS 3/8-18 ANSI G 4P 2.562 1.062 0.7 0.531 0.5 4 1 Y83304BR Y83305 NPS 1/2-14 ANSI G 4P 3.125 1.375 0.687 0.515 0.625 4 2 Y83305BR Thread Mills Y83306 NPS 3/4-14 ANSI G 4P 3.25 1.375 0.906 0.679 0.687 5 2 Y83306BR Y83307 NPS 1-11.5 ANSI G 4P 3.75 1.75 1.125 0.843 0.812 5 2 Y83307BR Dies Center Drills Centering Tools ANSI Pipe-9 310