日本弥满和Yamawa丝锥HVSP M4X0.7 P4 Spec   Overall length(L) 56 mm Thread length(ℓ) 9 mm Thread+Neck length(ℓn) 18 mm Shank length(ℓs) 32 mm Shank dia.(Ds) 4 mm Length of square(ℓk) 6 mm Size of square(K) 3.2 mm Surface Treatment OX Flute type SP(Spiral Fluted Taps for blind hole) Materials HSS Chamfer length 2.5P Number of flutes 3 Gross Weight 6 g Bored hole size 2.56 mm Engagement ratio 81 % (D1)Max. 2.599 mm (D1)Min. 2.459 mm Table of tapping speed recommended for each work material Low carbon steels 3～9 m/min Medium carbon steels 3～9 m/min High carbon steels 3～9 m/min Alloy steels 3～9 m/min Heat treated steel (25〜35HRC) ～5 m/min Heat treated steel (35〜45HRC) Heat treated steel (45〜55HRC) Heat treated steel (55〜63HRC) Stainless steels (SUS) ～5 m/min Tool steels Cast steels 3～9 m/min Cast irons Ductile cast irons Copper Brass Brass castings Bronze Wrought aluminum Aluminum alloy castings Magnesium alloy die castings Zinc alloy die castings Titanium alloys Nickel base alloys Thermosetting plastic Thermoplastic resin