@cutwelltd: Have you tried YG-1's Prime X-Coated Machine Taps? With up to 50% higher cutting speeds & 100% more tool life than HSSE taps, they are the number 1 choice for all-round high performance tapping on a wide range of materials. ✅For steel, stainless steel, cast iron and non-ferrous materials. ✅ Prime X-Coating increases too life. ✅Tough chip resistant cutting edge & high heat resistance. Call us today on 01924 869 610, email [email protected] or view online via our website.