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) ZELX MOLD NPT Hand Taps for Hard-to-Machine Materials For American Taper Pipe Threads Spiral Fluted Taps (for through hole) Specification ■Suitable for hard steels of 35 ~ 45HRC, such as forgings and thermal refined steels of high carbon steels and alloy steels, and die steels. Spiral Pointed Taps (for through hole) Recommended Tapping Speed depending on Materials Thermal re ned steels Tool steels 〜5 〜5 35~45HRC Hand Taps For icon explanation, refer to P.50 TYPE:1 TYPE:2 Cemented Carbide Taps Segment:1H Roll Taps Size Class Code Chamfer L ℓ Projection Ds K ℓk No. of Type (inch) (inch) (inch) (inch) (inch) (inch) flutes For American Pipe Threads NPT 1/8-27 ANSI G Y89641 3P 2.125 0.75 0.312 0.437 0.328 0.375 4 1 NPT 1/4-18 ANSI G Y89643 3P 2.437 1.062 0.459 0.562 0.421 0.437 4 1 Pipe Taps Simple Inspection Tools NPT 3/8-18 ANSI G Y89644 3P 2.562 1.062 0.454 0.7 0.531 0.5 4 1 NPT 1/2-14 ANSI G Y89645 3P 3.125 1.375 0.579 0.687 0.515 0.625 4 2 NPT 3/4-14 ANSI G Y89646 3P 3.25 1.375 0.565 0.906 0.679 0.687 5 2 Thread Mills Dies Center Drills Centering Tools ANSI Pipe-3 304