
⑤ Selection chart of taps Machining, in low- Tapping conditions speed tapping area Machining, in low/middle speed tapping area Product symbol LS-N-CT N-CT FC N-CT LA N-CT-SP N-CT-PO EH-CT UH-CT ACHSP MC-AD-CT Spiral Fluted Taps (for blind hole) ① Tap material HF HF HF HF HF HF Coating HF Coating HF Coating HF Coating Surface treatment For tapping Long, For cast For light For general use, For high- For ultra high- With oil Name for cast iron iron alloys carbide hardness steel hardness steel aluminum hole cast holes Spiral Fluted Taps (for through hole) ② Spiral Pointed Taps (for through hole) ③ Hand Taps ④ Bored Hole Shape For Metric Threads ⑤-18 ⑤-10 ⑤-3 ⑤-20 ⑤-21 ⑤-24 ⑤-28 ⑤-40 ⑤-42 Cemented Carbide Taps For Unified Threads ⑤-13 ⑤ For Whitworth Threads For Screw Threads used on Sewing Machines 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 ⑤-1