
④ Hand Tap Series Overall length L Thread length ℓ Thread + Neck ℓn length Shank length ℓs Shank dia. Ds Size of square K Length of square ℓk JIS HT LH Spiral Fluted Taps (for blind hole) ① JIS Hand Taps for Left Hand Threads Spiral Fluted Taps (for through hole) ② Specification ■The HT LH is a hand tap for left thread tapping. Spiral Pointed Taps (for through hole) Left hand 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 5 10 〜 5 10〜 5 10 〜 Hand Taps ( m / min ) ( m / min ) ( m / min ) ④ TYPE:1 TYPE:2 Cemented Carbide Taps ⑤ TYPE:3 TYPE:4 Roll Taps ⑥ Special Thread Taps Simple Inspection Tools ⑦ TYPE:5 TYPE:6 Pipe Taps ⑧ TYPE:7 TYPE:8 Thread Mills Premium Thread Mills ⑨ Dies ⑩ TYPE:9 TYPE:10 Center Drills Centering Tools ⑪ JIS ④-63