What is an HSS Cobalt Drill Bit?
Cobalt drill bits are a mixture of steel (or other alloys) and a small amount of cobalt, usually between 5-7%. Cobalt has a melting point of 1495°C and a boiling point of 2927°C, making it very suitable for use at high temperatures. By combining a small amount of cobalt with another alloy, the results are incredible.
Why choose cobalt drill bits?
Cobalt drill bits are very strong. They can run at much higher speeds than standard high-speed steel drill bits. Heat resistance means that the cobalt bit can be used for a long time without cooling or cutting fluid.
They are most commonly used for cutting hardened and abrasive materials. Cobalt bits can cut the hardest metals, including bronze, cast iron, stainless steel, and titanium. They can also cut welds.
The cutting edge of a high-quality cobalt drill should have a longer life than a standard HSS drill. Like other high-speed steel drill bits, they are corrosion resistant, which means they should maintain their condition under all storage and use conditions that may be encountered. However, cobalt can be very brittle. If your cobalt drill bits are not properly maintained or dropped, they may break-which can lead to high costs.