Irwin HSS TCT Drill Bit – 10502631

This 4mm Irwin HSS TCT drill bit is an essential size for workshop and industrial applications involving hardened materials. The 4mm diameter is widely used across engineering, maintenance, and fabrication tasks where robust drilling performance is required in challenging materials. Featuring a tungsten carbide tip, this drill bit is specifically designed to penetrate hardened steel, cast iron, bronze alloys, and manganese alloyed steel up to 50 Rockwell C hardness. The four-facetted ground tip ensures excellent centring from initial contact and reduces the drilling pressure required, which helps prevent tool deflection and produces cleaner holes. The Chrome Vanadium Steel body, hardened to 56 Rockwell C, provides the strength needed to withstand the demands of drilling hard materials. For use with stationary drilling machines, this 4mm bit delivers optimal results when operated with a 3-6% coolant emulsion. The coolant not only improves cutting performance but significantly extends the operational life of the carbide tip. Features and Benefits: • 4mm diameter for common engineering applications • Tungsten carbide tip for materials up to 50 Rockwell C • Perfect centring with four-facetted ground design • Chrome Vanadium Steel hardened to 56 Rockwell C • Pack of 1 Specifications: Tip Diameter (mm): 4.0 Working Length (mm): 43 Overall Length (mm): 75 Pack Qty.: 1 Diameter: 4.0mm. Total length: 75mm.