Explanation of icons High speed steel For blind hole with Spiral pointed tapthrough coolant holethrough hole use High speed steel For through hole with Hand tap (Cobalt HSS) radial coolant hole through hole use Powder HSS For left hand thread Hand tapblind hole use Left hand Ultra micro grain For synchronized Spiral fluted tap cemented carbide feeding through hole use Alloy steel Number of threads Spiral fluted tapon chamferblind hole use OxidizingOxide Center drillsleft hand cut Low spiralfluted tapblind hole use Low spiral fluted tap Nitriding <2D Cutting length blind hole usespecially for horizontal Nitride tapping Stainless steels Nitriding/Oxidizing ステンレス鋼 Specification5〜10Tapping Speeds Nitride+Oxide Coating Coated How to Read catalog-6