ZELX NI PO Spiral Pointed Taps for Nickel Base Alloys Size Class Code Chamfer L ℓ ℓn Ds K ℓk No. of Type (for blind hole) Spiral Fluted Taps (inch) (inch) (inch) (inch) (inch) (inch) flutes GH3 Y85505 GH4 Y85524 No.6-32UNC 4.5P 2 0.413 0.687 0.141 0.11 0.187 3 1 GH5 Y85535 GH7 Y85511 (for through hole) Spiral Fluted Taps No.6-40UNF GH2 Y85512 4.5P 2 0.413 0.687 0.141 0.11 0.187 3 1 Y85507 GH3 Y85507NI GH4 Y85529 (for through hole) Spiral Pointed Taps Y85537 GH5 No.8-32UNC Y85537NI 4.5P 2.125 0.453 0.75 0.168 0.131 0.25 3 1 Y85560 GH6 Y85560NI Y85567 Hand Taps GH7 Y85567NI GH3 Y85509 No.10-24UNC 4.5P 2.375 0.531 0.875 0.194 0.152 0.25 3 1 GH5 Y85539 Y85510 Carbide Taps Cemented GH3 Y85510NI Y85530 GH4 Y85530NI Y85540 Roll Taps No.10-32UNF GH5 4.5P 2.375 0.531 0.875 0.194 0.152 0.25 3 1 Y85540NI Y85561 GH6 Y85561NI Y85570 GH7 Simple Inspection Tools Pipe Taps Y85570NI Y85513 GH3 Y85513NI 1/4-20UNC 4.5P 2.5 0.591 1 0.255 0.191 0.312 3 2 Y85543 GH5 Y85543NI GH3 Y85514 Y85531 GH4 Y85531NI Y85544 Thread Mills GH5 1/4-28UNF Y85544NI 4.5P 2.5 0.591 1 0.255 0.191 0.312 3 2 Y85562 GH6 Y85562NI Y85574 Dies GH7 Y85574NI GH3 Y85515 5/16-18UNC GH5 Y85545 4.5P 2.718 0.669 1.125 0.318 0.238 0.375 3 3 GH7 Y85553 GH3 Y85516 Center Drills GH4 Y85532 5/16-24UNF GH5 Y85546 4.5P 2.718 0.669 1.125 0.318 0.238 0.375 3 3 GH6 Y85563 GH7 Y85576 Centering Tools GH3 Y85517 3/8-16UNC 4.5P 2.937 0.748 1.25 0.381 0.286 0.437 3 3 GH5 Y85547 ANSI PO-20 247