Overall Thread Thread+Neck Shank Shank Size of Length of length length length length dia. square square L ℓ ℓn ℓs Ds K ℓk PO OX (for blind hole) Spiral Fluted Taps Spiral Pointed Taps, Oxided Specification (for through hole) Spiral Fluted Taps E Oxide ~M26 M26~ Recommended Tapping Speeds depending on Materials (for through hole) Spiral Pointed Taps Free cutting and Carbon steel and structural steel low alloy steel IS P IS P 5〜10 5〜10 (m/min) (m/min) For icon explanation, refer to P.50 Hand Taps TYPE:1 DIN371 TYPE:2 DIN371 Carbide Taps Cemented TYPE:3 DIN376 / DIN374 TYPE:4 DIN371 Roll Taps TYPE:5 DIN376 / DIN374 / DIN5156 Simple Inspection Tools Special Thread Taps Pipe Taps Thread Mills Dies Center Drills Centering Tools DIN PO-8 121