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) NPTF Hand Taps for American Dryseal Taper Pipe Threads Spiral Fluted Taps (for through hole) Specification E Oxide NPTF 3/4 ~ Spiral Pointed Taps (for through hole) Recommended Tapping Speed depending on Materials Medium carbon steels 〜5 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 Projection Ds K ℓk No. of Type (inch) (inch) (inch) (inch) (inch) (inch) flutes For Dryseal American Pipe Threads Y83125 NPTF 1/16-27 ANSI G 3P 2.125 0.687 0.312 0.312 0.234 0.375 4 1 Y83125BR Pipe Taps Simple Inspection Tools Y83126 0.437 0.328 1 Y83126BR NPTF 1/8-27 ANSI G 3P 2.125 0.75 0.312 0.375 4 Y83127 0.312 0.234 2 Y83127BR Y83128 NPTF 1/4-18 ANSI G 3P 2.437 1.062 0.459 0.562 0.421 0.437 4 1 Y83128BR Y83129 NPTF 3/8-18 ANSI G 3P 2.562 1.062 0.454 0.7 0.531 0.5 4 1 Y83129BR Thread Mills Y83130 NPTF 1/2-14 ANSI G 3P 3.125 1.375 0.579 0.687 0.515 0.625 4 2 Y83130BR Y83131 NPTF 3/4-14 ANSI G 3P 3.25 1.375 0.565 0.906 0.679 0.687 5 2 Y83131BR Dies Y83132 NPTF 1-11.5 ANSI G 3P 3.75 1.75 0.678 1.125 0.843 0.812 5 2 Y83132BR Y83133 NPTF 1 1/4-11.5 ANSI G 3P 4 1.75 0.686 1.312 0.984 0.937 5 2 Y83133BR Y83134 Center Drills NPTF 1 1/2-11.5 ANSI G 3P 4.25 1.75 0.699 1.5 1.125 1 6 2 Y83134BR Y83135 NPTF 2-11.5 ANSI G 3P 4.5 1.75 0.667 1.875 1.406 1.125 6 2 Y83135BR Centering Tools ANSI Pipe-7 308