Spiral Pointed Tap Overall Thread Thread+Neck Shank Size of Length of length length length dia. square square L ℓ ℓn Ds K ℓk ZELX NI PO STI Spiral Pointed Taps for Nickel Base Alloys for Helical Coil Wire Screw Thread Inserts 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 Y87262 STI 3/8-16UNC 4.5P 3.375 0.984 - 0.367 0.275 0.437 3 4 GH4 Y87270 GH2 Y87253 Spiral Fluted Taps (for through hole) STI 3/8-24UNF 4.5P 3.156 0.866 - 0.323 0.242 0.406 3 4 GH3 Y87263 STI 7/16-14UNC GH3 Y87264 4.5P 3.593 0.984 - 0.429 0.322 0.5 3 4 GH3 Y87265 STI 7/16-20UNF 4.5P 3.375 0.984 - 0.367 0.275 0.437 3 4 GH4 Y87275 Spiral Pointed Taps (for through hole) STI 1/2-13UNC GH3 Y87266 4.5P 3.812 1.083 - 0.48 0.36 0.562 3 4 STI 1/2-20UNF GH3 Y87267 4.5P 3.593 0.984 - 0.429 0.322 0.5 3 4 Hand Taps Cemented Carbide Taps Roll Taps Pipe Taps Simple Inspection Tools Thread Mills Dies Center Drills Centering Tools ANSI PO-23 250