Spiral Pointed Tap Overall Thread Thread+Neck Shank Shank Size of Length of length length length length dia. square square L ℓ ℓn ℓs Ds K ℓk ZELX NI PO Spiral Pointed Taps for Nickel Base Alloys Spiral Fluted Taps (for blind hole) Size Class Code Chamfer L ℓ ℓn Ds K ℓk No. of Type (inch) (inch) (inch) (inch) (inch) (inch) flutes GH3 Y85518 GH4 Y85533 3/8-24UNF GH5 Y85548 4.5P 2.937 0.748 1.25 0.381 0.286 0.437 3 3 Spiral Fluted Taps (for through hole) GH6 Y85564 GH7 Y85578 GH3 Y85519 7/16-14UNC 4.5P 3.156 0.866 - 0.323 0.242 0.406 3 4 GH5 Y85549 Spiral Pointed Taps (for through hole) GH3 Y85520 7/16-20UNF 4.5P 3.156 0.866 - 0.323 0.242 0.406 3 4 GH5 Y85550 GH3 Y85521 1/2-13UNC 4.5P 3.375 0.984 - 0.367 0.275 0.437 3 4 GH5 Y85551 GH3 Y85522 Hand Taps GH5 Y85552 1/2-20UNF 4.5P 3.375 0.984 - 0.367 0.275 0.437 3 4 Y85582 GH7 Y85582NI GH3 Y85525 Cemented Carbide Taps 5/8-11UNC GH5 Y85555 4.5P 3.812 1.083 - 0.48 0.36 0.562 3 4 GH7 Y85585 GH3 Y85526 5/8-18UNF GH5 Y85556 4.5P 3.812 1.083 - 0.48 0.36 0.562 3 4 Roll Taps GH7 Y85586 GH3 Y85527 3/4-10UNC 4.5P 4.25 1.201 - 0.59 0.442 0.687 3 4 GH5 Y85557 GH3 Y85528 3/4-16UNF 4.5P 4.25 1.201 - 0.59 0.442 0.687 3 4 GH5 Y85558 Pipe Taps Simple Inspection Tools Thread Mills Dies Center Drills Centering Tools ANSI PO-21 248