Spiral Fluted Taps (for blind hole)Spiral Fluted Taps(for through hole)Spiral Pointed Taps(for through hole)Hand TapsCementedCarbide TapsRoll TapsSpecial Thread TapsSimple Inspection ToolsPipe TapsThread MillsPremium Thread MillsDiesCenter DrillsCentering Tools JIS ① Spiral Fluted Tap Series for blind hole Overall Thread Thread + Neck Shank Shank Size of Length oflengthlengthlengthlengthdia.squaresquareLℓℓnℓsDsKℓk JIS ① HC+SP HC- SP Spiral Fluted Taps for High Carbon Steels ② Specification ・Product Name and Size. HC+SP 〜 M6 HC−SP M8 〜 , all W ③ Recommended Tapping Speeds depending on Materials Medium carbon steels High carbon steels 中炭素鋼 高炭素鋼 5〜10 5〜10 ④ (m/min) (m/min) Product Features ●The HC+SP/HC-SP is a spiral flute tap for high carbon steel such as S55C and is suitable for tapping of medium and high hardness materials up to 30 HRC. ⑤ Tapping conditions The HC+SP/HC-SP is best suited for tapping of high carbon steel, alloy tool steel and refined steel. Workpiece Material Cutting Speed(m/min) S45C 〜High Carbon Steel 10 〜 20 ⑥ SKC、SKDAlloy Tool Steel 5 〜 10 Thermal Refining Steel25 〜 35HRC 5 〜 10 ⑦ Product chart (tensile strength) HC + SP / HC - SP application range (tensile strength) ⑧ Reference EH-HT    EH-PO E-SP ⑨ HC+SP/HC-SP SP ⑩ Unit:MPa *5006007008009001000 *1MPa=1N/mm2≒1Kgf/mm2÷9.8 ⑪ JIS ①-129