③ Spiral Pointed Tap Series for through 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 HC+PO Spiral Fluted Taps (for blind hole) ① JIS HC- PO Spiral Pointed Taps for High Carbon Steels Spiral Fluted Taps (for through hole) ② Specification Spiral Pointed Taps (for through hole) ③ Recommended Tapping Speeds depending on Materials ・Product Name and Size. Medium carbon steels High carbon steels Thermal refined steels HC+PO 〜 M2.6 中炭素鋼 高炭素鋼 調質鋼 HC−PO M3 〜 5 10〜 5 10 〜 5 10 〜 Hand Taps ( m / min ) ( m / min ) ( m / min ) ④ 25〜35HRC Product Features ●The HC+PO/HC-PO is a spiral pointed tap suitable for the tapping medium and high hardness workpiece materials up to 35 HRC in high carbon steel such as S55C. Cemented Carbide Taps ⑤ Product system chart (tensile strength) HC+PO/HC-PO Application range (tensile strength) Roll Taps Reference EH-HT ⑥ EH-PO E-SP Special Thread Taps Simple Inspection Tools ⑦ HC+PO/HC-PO PO Pipe Taps Unit:MPa* ⑧ 500 600 700 800 900 1000 *1MPa=1N/mm ≒1Kgf/mm ÷9.8 2 2 Thread Mills Premium Thread Mills ⑨ Dies ⑩ Center Drills Centering Tools ⑪ JIS ③-75