TOOLTALK Drill Bits Drill Materials 1. H igh Speed Steel (HSS) – Combines strength, toughness and high temperature hardness for a low cost. Uses: Drilling metal, hardwood and many other materials 2. Cobalt – Great abrasion resistance for tool life compared to standard HSS. Uses: Tough metals, free machining stainless steel, high-temp alloys, titanium and some plastic 3. C arbide – Increased stiffness and ability to operate at high speeds. Uses: Best used in shops with newer machines utilizing rigid setups Coatings/Surface Treatment Silver (Bright Polished) Surface Treatment – Has no coating, increases chip flow in soft materials. Gold Surface Treatment – Low temperature stress relieving process imparts a gold color to the surface of the bit. Gold extends tool life and improves lubricity. Oxide Surface Treatment – Retains lubricants to reduce falling and chip flow in soft materials. Specific to iron and steel applications. TiN (Titanium Nitride – Gold Color) Coating – Multi-purpose coating that increases tool life and performance. Increased hardness and heat resistance allows tools to run at higher speeds and feeds. TiAlN (Titanium Aluminum Nitride - Violet Black Color) Coating – Used for high temperatures or abrasive conditions. Requires increase of 75%-100% in machining speeds. Used for stainless steel, high alloy carbon steels, nickel-based high temp allows and titanium alloys. TiCN (Titanium Carbon Nitride - Violet Grey Color) Coating – Harder and more wear resistant in moderate temperatures. Allows user to run jobs at higher speeds. Requires increase of 35%-50% in machining speeds. Used for stainless steels, cast iron, and aluminum. Other Coatings: Bronze, EXO, Straw Oxide and V 1 2 3 Looking for Metalworking Tools? Contact Fastenal at 844.365.8665 or cuttingtoolsupport@fastenal.com 19.3 Go to www.fastenal.com/metalworking for previous Tool Talks FMPM-8540 JP 4/19
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