Overall Thread Thread+Neck Shank Shank Size of Length of length length length length dia. square square L ℓ ℓn ℓs Ds K ℓk SP Spiral Fluted Taps Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk No. of Type (for blind hole) Spiral Fluted Taps (inch) (inch) (inch) (inch) (inch) (inch) (inch) flutes GH2 SSU08N2NEB GH3 SSU08N3NEB 1/2-20UNF 2.5P 4.331 1.024 - 2.205 0.367 0.275 0.437 3 4 GH5 SSU08N5NEB GH11 SSU08N-EEB (for through hole) Spiral Fluted Taps GH3 SSU09S3NEB 9/16-12UNC GH4 SSU09S4NEB 2.5P 4.331 1.024 - 2.205 0.429 0.322 0.5 3 4 GH5 SSU09S5NEB GH3 SSU09O3NEB (for through hole) Spiral Pointed Taps 9/16-18UNF GH4 SSU09O4NEB 2.5P 4.331 1.024 - 2.205 0.429 0.322 0.5 3 4 GH5 SSU09O5NEB GH3 SSU10U3NEB GH4 SSU10U4NEB 5/8-11UNC 2.5P 4.331 1.024 - 2.205 0.480 0.36 0.562 3 4 Hand Taps GH5 SSU10U5NEB GH11 SSU10U-EEB GH3 SSU10O3NEB GH4 SSU10O4NEB 5/8-18UNF 2.5P 4.331 1.024 - 2.205 0.480 0.36 0.562 3 4 Carbide Taps Cemented GH5 SSU10O5NEB GH11 SSU10O-EEB GH3 SSU12V3NEB 3/4-10UNC GH5 SSU12V5NEB 2.5P 4.921 1.299 - 2.52 0.590 0.442 0.687 4 4 GH11 SSU12V-EEB Roll Taps GH3 SSU12P3NEB GH4 SSU12P4NEB 3/4-16UNF 2.5P 4.921 1.299 - 2.52 0.590 0.442 0.687 4 4 GH5 SSU12P5NEB GH11 SSU12P-EEB GH4 SSU14W4NEB Simple Inspection Tools Pipe Taps 7/8-9UNC GH5 SSU14W5NEB 2.5P 5.512 1.299 - 2.795 0.697 0.523 0.75 4 4 GH6 SSU14W6NEB GH3 SSU14Q3NEB 7/8-14UNF GH4 SSU14Q4NEB 2.5P 5.512 1.299 - 2.795 0.697 0.523 0.75 4 4 GH6 SSU14Q6NEB GH4 SSU16X4NEB 1-8UNC GH5 SSU16X5NEB 2.5P 6.299 1.457 - 3.228 0.800 0.6 0.812 4 4 GH6 SSU16X6NEB Thread Mills GH3 SSU16S3NEB GH4 SSU16S4NEB 1-12UNF 2.5P 6.299 1.457 - 3.228 0.800 0.6 0.812 4 4 GH5 SSU16S5NEB GH6 SSU16S6NEB Dies GH4 SSU18Y4NEB 1 1/8-7UNC 2.5P 7.087 1.732 - 3.622 0.896 0.672 0.875 4 4 GH6 SSU18Y6NEB GH4 SSU18S4NEB 1 1/8-12UNF 2.5P 7.087 1.732 - 3.622 0.896 0.672 0.875 4 4 GH5 SSU18S5NEB GH4 SSU20Y4NEB Center Drills 1 1/4-7UNC 2.5P 7.087 1.929 - 3.622 1.021 0.766 1 4 4 GH6 SSU20Y6NEB GH4 SSU20S4NEB 1 1/4-12UNF 2.5P 7.087 1.929 - 3.622 1.021 0.766 1 4 4 GH5 SSU20S5NEB GH5 SSU22Z5NEB Centering Tools 1 3/8-6UNC 2.5P 7.874 2.165 - 4.016 1.108 0.831 1.062 4 4 GH6 SSU22Z6NEB GH4 SSU22S4NEB 1 3/8-12UNF 2.5P 7.874 2.165 - 4.016 1.108 0.831 1.062 4 4 GH5 SSU22S5NEB ANSI SP-4 191