HSS Forming Tap Type: Metric, UNC, UNF, BSW Material: HSS Co8%,CPM,imported from Germany Used on IT products. Suitable for hole condition:Blind hole/through hole Advantage:1. Chipless tapping; 2. Highercutting speed; 3. Stronger threads; 4. Better thread gauging; 5. Longer tap life; 6. Higer productivity; 7. Lower tap breakage; Forming taps must be applied in materials that cold form well. This includes light metals and light metal alloys as well as steels and other materials with tensile strength to 1200 N/mm2 and hardness below about RC 35 - 40. Generally, materials that produce a continuous chip when drilling are good candidates for thread forming. This list is longer than you might think, and includes wrought and cast aluminum and aluminum alloys, copper, brass, stainless steels, carbon steels, and zinc diecasting alloys.Thread forming is useful for both blind and through holes, and can produce threads of any length. But because thread forming produces no chips, it is especially well suited to tapping blind holes. Thread forming can also eliminate the need for special taps to produce threads interrupted by longitudinal slots or cross-holes.