Spiral Fluted Taps (for blind hole)Spiral Fluted Taps(for through hole)Spiral Pointed Taps(for through hole)Hand TapsCementedCarbide TapsRoll TapsSpecial Thread TapsSimple Inspection ToolsPipe TapsThread MillsPremium Thread MillsDiesCenter DrillsCentering Tools Overall Thread Thread + Neck Shank Size of Length oflengthlengthlengthdia.squaresquareLℓℓnDsKℓk⑦ ANSI Size Class Code Chamfer L (inch) ℓ(inch) ℓn(inch) Ds(inch) K(inch) ℓk(inch) No. offlutes TYPE5/16-18UNCGH4Y872724.5P2.9370.7481.250.3810.2860.43733 ① 5/16-24UNF GH2 Y87251 4.5P 2.937 0.748 1.25 0.381 0.286 0.437 3 3 5/16-24UNF GH3 Y87261 4.5P 2.937 0.748 1.25 0.381 0.286 0.437 3 3 3/8-16UNC GH3 Y87262 4.5P 3.375 0.984 - 0.367 0.275 0.437 3 4 3/8-16UNC GH4 Y87270 4.5P 3.375 0.984 - 0.367 0.275 0.437 3 4 ② 3/8-24UNF GH2 Y87253 4.5P 3.156 0.866 - 0.323 0.242 0.406 3 4 3/8-24UNF GH3 Y87263 4.5P 3.156 0.866 - 0.323 0.242 0.406 3 4 7/16-14UNC GH3 Y87264 4.5P 3.593 0.984 - 0.429 0.322 0.5 3 4 7/16-20UNF GH3 Y87265 4.5P 3.375 0.984 - 0.367 0.275 0.437 3 4 7/16-20UNF GH4 Y87275 4.5P 3.375 0.984 - 0.367 0.275 0.437 3 4 ③ 1/2-13UNC GH3 Y87266 4.5P 3.812 1.083 - 0.48 0.36 0.562 3 4 1/2-20UNF GH3 Y87267 4.5P 3.593 0.984 - 0.429 0.322 0.5 3 4 ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ANSI ※ This product is different from JIS products in shape and dimensions, please be careful when using. ⑦-24