Spiral Fluted Tap Series for blind hole Overall length L Thread length ℓ Thread + Neck ℓn length Shank length ℓs Shank dia. Ds Size of square K Length of square ℓk ① JIS SP OX Spiral Fluted Taps (for blind hole) ① JIS Spiral Fluted Taps, Oxidized Spiral Fluted Taps (for through hole) ② Specification ■The SP OX is a spiral flute tap for blind hole tapping. These taps have an applied oxidation treatment to prevent chip welding on the Spiral Pointed Taps (for through hole) Oxide surface of the taps threaded portion. They are ③ suitable for thread processing of soft steel Recommended Tapping Speeds depending on Materials materials where the chips easily weld to the tap Low carbon steels Medium carbon steels High carbon steels like low carbon. 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 Cemented Carbide Taps ⑤ TYPE:2 TYPE:3 Roll Taps ⑥ Special Thread Taps Simple Inspection Tools ⑦ TYPE:4 TYPE:5 Pipe Taps ⑧ Thread Mills Premium Thread Mills ⑨ TYPE:6 TYPE:7 Dies ⑩ Center Drills Centering Tools ⑪ JIS ①-62