① 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 JIS HDISP Spiral Fluted Taps (for blind hole) ① JIS For Dry Tapping, Blind Hole Use. Spiral Fluted Taps for Steels Spiral Fluted Taps (for through hole) ② Specification <2D Coating Spiral Pointed Taps (for through hole) ③ Recommended Tapping Speeds depending on Materials Medium carbon steels High carbon steels Alloy steels 中炭素鋼 高炭素鋼 合金鋼 10 20 10 20 10 20 〜 〜 〜 Hand Taps ( m / min ) ( m / min ) ( m / min ) ④ Product Features  Designed with a through center hole for coolant lubrication, mist lubrication or air blast applications in blind holes. ● ●The HDISP has a slow spiral flute, making it the optimum tap for blind hole tapping on horizontal and vertical machines in materials such as carbon steel and alloy steel. Cemented Carbide Taps ⑤ Tapping Data Tapping Condistion [P4 M10×1.25] Work Piece Material S50C(18HRC) Bored Hole Shape Blind hole Roll Taps ⑥ Bored Hole Size φ8.8 HDISP Tapping Length 12mm Can Continue Tapping Speed 8m/min Conventional Machinery Type CNCtapping machine Product Cutting Fluid Dry (Without tapping fluid) Special Thread Taps Simple Inspection Tools 0 50 100 150 200 250 300 350 400 ⑦ Number of Holes 380 (Number of holes processed) Processed Speed chart Slow Tapping Speed Fast Pipe Taps Work Piece 5m/min 10m/min 15m/min 20m/min Work Piece ⑧ Material Fully synchronous feed area Material SCM SCM Alloy Alloy Steel SCr SCr Steel HDISP Thread Mills Premium Thread Mills High High ⑨ Carbon Steel S45C ※Dry tapping S45C Carbon Steel S45C S45C Medium Medium Carbon SP F-SP Carbon Steel Steel Dies S30C +SP S30C ⑩ S25C S25C Low Low Carbon Carbon Steel Steel SS400 SS400 5m/min 10m/min 15m/min 20m/min Center Drills Centering Tools Tapping range by material being cut. ⑪ JIS ①-199