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 OX (for blind hole) Spiral Fluted Taps Spiral Fluted Taps,Oxided Specification (for through hole) Spiral Fluted Taps E Oxide 1 1/8U ~ Recommended Tapping Speed depending on Materials (for through hole) Spiral Pointed Taps ow carbon steels Medium carbon steels 5〜10 5〜10 For icon explanation, refer to P.50 TYPE:1 TYPE:2 Hand Taps Carbide Taps Cemented TYPE:3 TYPE:4 Roll Taps Segment:1C Simple Inspection Tools Pipe Taps Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk No. of Type (inch) (inch) (inch) (inch) (inch) (inch) (inch) flutes For Unified Threads GH1 SSUN2E1NEX No.2-56UNC 2.5P 1.772 0.314 - 1.161 0.141 0.11 0.187 2 1 GH2 SSUN2E2NEX GH1 SSUN2D1NEX No.2-64UNF 2.5P 1.772 0.314 - 1.161 0.141 0.11 0.187 2 1 Thread Mills GH2 SSUN2D2NEX GH1 SSUN3F1NEX No.3-48UNC 2.5P 2.205 0.354 0.669 1.28 0.141 0.11 0.187 2 2 GH2 SSUN3F2NEX GH1 SSUN3E1NEX No.3-56UNF 2.5P 2.205 0.354 0.669 1.28 0.141 0.11 0.187 2 2 GH2 SSUN3E2NEX Dies GH1 SSUN4H1NEX No.4-40UNC 2.5P 2.205 0.354 0.709 1.28 0.141 0.11 0.187 2 2 GH2 SSUN4H2NEX GH1 SSUN4F1NEX No.4-48UNF 2.5P 2.205 0.354 0.709 1.28 0.141 0.11 0.187 2 2 GH2 SSUN4F2NEX Center Drills GH1 SSUN5H1NEX No.5-40UNC 2.5P 2.205 0.433 0.768 1.358 0.141 0.11 0.187 2 2 GH2 SSUN5H2NEX GH1 SSUN5G1NEX No.5-44UNF 2.5P 2.205 0.433 0.768 1.358 0.141 0.11 0.187 2 2 GH2 SSUN5G2NEX GH1 SSUN6J1NEX Centering Tools GH2 SSUN6J2NEX No.6-32UNC 2.5P 2.205 0.433 0.768 1.358 0.141 0.11 0.187 3 2 GH3 SSUN6J3NEX GH4 SSUN6J4NEX ANSI SP-6 193