Spiral Fluted Tap Overall Chamfer + Thread Thread+Neck Shank Shank Size of Length of length full thread length length length dia. square square L ℓt ℓ ℓn ℓs Ds K ℓk SP OX STI Spiral Fluted Taps for Helical Coil Wire Screw Thread Inserts, Oxided Spiral Fluted Taps (for blind hole) Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk No. of Type (inch) (inch) (inch) (inch) (inch) (inch) (inch) flutes GH2 SUU07Q2NEX STI 7/16-14UNC 2P 4.331 1.024 - 2.205 0.429 0.322 0.5 3 3 GH3 SUU07Q3NEX GH2 SUU07N2NEX Spiral Fluted Taps (for through hole) STI 7/16-20UNF 2P 4.331 1.024 - 2.205 0.429 0.322 0.5 3 3 GH3 SUU07N3NEX GH2 SUU08R2NEX STI 1/2-13UNC 2P 4.331 1.024 - 2.205 0.480 0.36 0.562 3 3 GH3 SUU08R3NEX GH2 SUU08N2NEX STI 1/2-20UNF 2P 4.331 1.024 - 2.205 0.480 0.36 0.562 3 3 Spiral Pointed Taps (for through hole) GH3 SUU08N3NEX Hand Taps Cemented Carbide Taps Roll Taps Pipe Taps Simple Inspection Tools Thread Mills Dies Center Drills Centering Tools ANSI SP-25 212