... 2,durable in use 3,dependable performance 4, complete in specifications machine taps and hand tapsmade from hss.we can supply ... Protect surface hardness6.High roughness and high intension threadHSS-Co machine taps TiN/TiAlN coated or not Spiral flute taps ... iron,Stainless steel etc materials processingCharacteristics of the material, Machine,Clamping method and the tapping speed has a great influence ...