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 ◎=Standard ○=Semi standard △=Made to order ST-12 ※For improvement, spec may change without advance notice. 531547 For improvement, spec may change without advance notice.