Overall length L Thread length ℓ Thread + Neck length ℓn Shank dia. Ds Size of square K Length of square ℓk ① ANSI L ℓ ℓn Ds K ℓk No. of Size Class Code Chamfer TYPE Spiral Fluted Taps (for blind hole) (inch) (inch) (inch) (inch) (inch) (inch) flutes ① 5/8-18UNF GH3 Y84426 2.5P 3.812 0.512 - 0.48 0.36 0.562 3 4 3/4-10UNC GH3 Y84427 2.5P 4.25 0.827 - 0.59 0.442 0.687 4 4 3/4-16UNF GH3 Y84428 2.5P 4.25 0.591 - 0.59 0.442 0.687 4 4 Spiral Fluted Taps (for through hole) ② Spiral Pointed Taps (for through hole) ③ Hand Taps ④ Cemented Carbide Taps ⑤ Roll Taps ⑥ Special Thread Taps Simple Inspection Tools ⑦ Pipe Taps ⑧ Thread Mills Premium Thread Mills ⑨ Dies ⑩ Center Drills Centering Tools ⑪ ANSI ※ This product is different from JIS products in shape and dimensions, please be careful when using. ①-178