Special Thread Taps / Simple Inspection Tools Overall length L Thread length ℓ Thread + Neck ℓn length Shank length ℓs Shank dia. Ds Size of square K Length of square ℓk ⑦ JIS HT CTC Spiral Fluted Taps (for blind hole) ① JIS Hand Taps for Steel Conduit Threads Spiral Fluted Taps (for through hole) ② Specification ■Tap for steel conduit threads. Thread angle is 80 degree and the thread symbol is CTC. Spiral Pointed Taps (for through hole) ③ Recommended Tapping Speeds depending on Materials Low carbon steels Medium carbon steels High carbon steels 低炭素鋼 中炭素鋼 高炭素鋼 〜 10 〜 10 〜 10 Hand Taps ( m / min ) ( m / min ) ( m / min ) ④ TYPE:1 Cemented Carbide Taps ⑤ Segment:1A Roll Taps Basic ⑥ L ℓ ℓn ℓs Ds K ℓk No. of TYPE MSRP Size Code Chamfer major dia (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) flutes For Steel Conduit Threads CTC19-16 TYCC190HEB5 5P 19.100 105 23 - 50 15 12 15 4 1 ¥14,500 □ CTC25-16 TYCC250HEB5 5P 25.400 125 24 - 58 19 15 18 4 1 ¥31,700 □ Special Thread Taps Simple Inspection Tools CTC31-16 ¥45,800 □ ⑦ TYCC310HEB5 5P 31.800 145 26 - 67 24 19 22 4 1 CTC39-16 TYCC390HEB5 5P 38.100 165 27 - 76 30 23 26 4 1 ¥61,100 □ Pipe Taps ■ For Steel Conduit Threads unit: mm ■ Bored hole size ⑧ unit: mm Pitch Diameter Minor Diameter Minor Diameter of Internal Thread(D1) Bored Hole Size Size (Reference) Size Max. Min. Basic Size Basic Size CTC 19 - 16 18.208 17.808 18.11 CTC 19 - 16 18.343 17.708 CTC 25 - 16 24.508 24.108 24.41 Thread Mills Premium Thread Mills CTC 25 - 16 24.643 24.008 CTC 31 - 16 30.908 30.508 30.81 ⑨ CTC 31 - 16 31.043 30.408 CTC 39 - 16 37.208 36.808 37.11 CTC 39 - 16 37.343 36.708 Dies ⑩ Center Drills Centering Tools ⑪ JIS ※ = Specified Distribution Items. Made to order products. □=In stock at manufacturer. ⑦-36