Uxcell M8 x 1.25 TiAlN Coated M35 Cobalt High Speed Steel Combination Drill Tap Bit 2 Pack

Combination drill and tap bit set can complete hole drilling tapping deburring and countersinking. One-step operation greatly saves processing steps and improves working efficiency. Suitable for processing blind holes. Used for tapping aluminum stainless steel cast iron cast steel hardened steel bronze hard plastics etc.. Recommended feed rate: general steel: 6-15m/min; harder steel: 5-10m/min; stainless steel: 2-7m/min; cast iron: 8-10m/min. Self-centering point do not need assistant center drilling or center punching. Quick change 1/4-inch hex shank can be used on power tools more easily and securely. A tapered end on hex shank can prevent excessive tapping. It exceeds the tap to prevent thread breakage from over-drilling. M35 cobalt high speed steel tool features high hardness (HRC65-66) and high red hardness high wear resistance. AlTiN coating improves the high temperature resistance. It has excellent wear resistance oxidation resistance. Use on drilling machines tapping machines CNC and milling machines. Use with tapping oil to get higher quality threads and more durable taps. Machine taps are suggested to be used with tap collets with overload protection. The torque caused by too fast feed speed is too large which can easily cause the tap to break. Taps are prone to chipping or breaking due to speed overload or non-vertical tapping. Micro taps (such as M1-M3.5) are mainly used in clocks and watches tapping wood and soft metals with lower hardness.