Irwin 10502693 12mm HSS TCT Tip Drill Bits

This 12mm Irwin HSS TCT drill bit is an essential tool for larger drilling operations in hardened materials. The 12mm diameter is widely used across heavy engineering, fabrication, and structural work for creating substantial bolt holes, mounting points, and connections in the most demanding materials. Featuring a tungsten carbide tip, this drill bit is designed to penetrate hardened steel, cast iron, bronze alloys, and manganese alloyed steel up to 50 Rockwell C hardness. The four-facetted ground tip provides precise centring from the start of drilling, which is particularly important at 12mm diameter where maintaining accuracy under significant drilling forces is essential. The reduced drilling pressure characteristic ensures more controlled and efficient operation. The Chrome Vanadium Steel body, hardened to 56 Rockwell C, delivers the strength and wear resistance required for larger diameter drilling in hard materials. This 12mm bit is engineered for use with stationary drilling ma