
③ Selection chart of taps Tapping conditions Machining, in low-speed tapping area HC+PO Product symbol IPO PO LS-PO LS-PO-K PO LH PO OX +PO HC-PO OX Spiral Fluted Taps (for blind hole) HC - PO ① Tap material HSS OX HSS HSS HSS HSS HSS OX HSS HSS HSS OX Surface treatment For general use For high For general Long, for For general For high Name I series use general use Long neck For left-hand Oxided use carbon steels carbon steel, threads oxided Spiral Fluted Taps (for through hole) ② Spiral Pointed Taps (for through hole) ③ Hand Taps ④ Bored Hole Shape For Metric Threads ③-32 ③-13 ③-51 ③-58 ③-46 ③-34 ③-30 ③-76 ③-78 Cemented Carbide Taps For Unified Threads ③-17 ③-54 ③-47 ③-35 ⑤ For Whitworth Threads ③-18 ③-54 ③-47 ③-36 For Screw Threads used on Sewing Machines ③-18 Pipe Threads American Pipe Threads Roll Taps For Miniature Threads ⑥ For Trapezoidal Threads ~ S25C Low carbon steels ◆ ◎ ◆ ◎ S25C ~ S45C Medium carbon steels ◆ ◎ ◆ ◎ ◆ ◎ ◆ ◎ ◆ ◎ ◆ ◎ ◆ ○ ◆ ◎ S45C ~ High carbon steels ◆ ○ ◆ ○ ◆ ○ ◆ ○ ◆ ○ ◆ ○ ◆ ◎ ◆ ◎ Special Thread Taps Simple Inspection Tools ⑦ SCM Alloy steels 25 ~ 35HRC Heat treated steel ◆ ○ ◆ ○ 35 ~ 45HRC Heat treated steel 45 ~ 55HRC Heat treated steel Pipe Taps 55 ~ 63HRC Heat treated steel ⑧ SUS Stainless steels(SUS) SKD Tool steels SC Cast steels FC Cast irons Thread Mills Premium Thread Mills ⑨ FCD Ductile cast irons Cu Copper Bs Brass BsC Brass castings Dies PB Bronze ⑩ AL Wrought aluminum AC, ADC Wrought aluminum Mg Magnesium alloy die castings ZDC Zinc alloy die castings Center Drills Centering Tools Titanium alloys ⑪ Nickel base alloys Thermosetting plastic Thermoplastic resin ③-1