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 MOLD (for blind hole) Spiral Fluted Taps Hand Taps for Hard-to-Machine Materials Specification (for through hole) Spiral Fluted Taps ■Suitable for hard steels of 35 ~ 45HRC, such as forgings and thermal refined steels of high carbon steels and alloy steels, and die steels. Recommended Tapping Speed depending on Materials (for through hole) Spiral Pointed Taps Thermal re ned steels Tool steels 〜5 〜5 35~45HRC For icon explanation, refer to P.50 Hand Taps TYPE:1e TYPE:2e Carbide Taps Cemented TYPE:e3 TYPE:4e Roll Taps Segment:1B Simple Inspection Tools Pipe Taps Size Class Code Chamfer L ℓ ℓn Ds K ℓk No. of Type (inch) (inch) (inch) (inch) (inch) (inch) flutes For Unified Threads No.4-40UNC GH2 Y89599 5P 1.875 0.335 0.562 0.141 0.11 0.187 3 1 No.5-40UNC GH2 Y89601 5P 1.937 0.374 0.625 0.141 0.11 0.187 3 1 No.6-32UNC GH3 Y89602 5P 2 0.413 0.687 0.141 0.11 0.187 3 1 Thread Mills No.8-32UNC GH3 Y89604 5P 2.125 0.453 0.75 0.168 0.131 0.25 3 1 No.10-24UNC GH3 Y89606 5P 2.375 0.531 0.875 0.194 0.152 0.25 3 1 No.10-32UNF GH3 Y89607 5P 2.375 0.531 0.875 0.194 0.152 0.25 3 1 1/4-20UNC GH3 Y89613 5P 2.5 0.591 1 0.255 0.191 0.312 3 2 1/4-28UNF GH3 Y89614 5P 2.5 0.591 1 0.255 0.191 0.312 3 2 Dies 5/16-18UNC GH3 Y89615 5P 2.718 0.669 1.125 0.318 0.238 0.375 4 3 5/16-24UNF GH3 Y89616 5P 2.718 0.669 1.125 0.318 0.238 0.375 4 3 3/8-16UNC GH3 Y89617 5P 2.937 0.748 1.25 0.381 0.286 0.437 4 3 3/8-24UNF GH3 Y89618 5P 2.937 0.748 1.25 0.381 0.286 0.437 4 3 Center Drills 7/16-14UNC GH3 Y89619 5P 3.156 0.866 - 0.323 0.242 0.406 4 4 7/16-20UNF GH3 Y89620 5P 3.156 0.866 - 0.323 0.242 0.406 4 4 1/2-13UNC GH3 Y89621 5P 3.375 0.984 - 0.367 0.275 0.437 4 4 1/2-20UNF GH3 Y89622 5P 3.375 0.984 - 0.367 0.275 0.437 4 4 Centering Tools 5/8-11UNC GH3 Y89625 5P 3.812 1.083 - 0.48 0.36 0.562 4 4 5/8-18UNF GH3 Y89626 5P 3.812 1.083 - 0.48 0.36 0.562 4 4 3/4-10UNC GH3 Y89627 5P 4.25 1.201 - 0.59 0.422 0.687 4 4 3/4-16UNF GH3 Y89628 5P 4.25 1.201 - 0.59 0.422 0.687 4 4 ANSI HT-20 271