Overall Thread Thread+Neck Shank dia. Size of Length of Length Length length square square L ℓ ℓn Ds K ℓk (for blind hole) Spiral Fluted Taps (for through hole) Spiral Fluted Taps (for through hole) Spiral Pointed Taps Hand Taps Carbide Taps Cemented Roll Taps Simple Inspection Tools Special Thread Taps Pipe Taps Thread Mills Dies Center Drills Centering Tools JIS ◎◎==SSttaannddaarrdd ○○==SSeemmii ssttaannddaarrdd △△==MMaaddee ttoo oorrddeerr RO-22 ※For improvement, spec may change without advance notice. 15417