![]() A right compromise between increased tool life and increased productivity has to be arrived at to effectively balance the increased cost of the tools. Most Reliable Cobalt Drill Bit Set from CraftsmanĬobalt drills can cost from 1.75 to 2.5 times more than normal HSS drills. Cobalt drill bits are more resistant to overheating, work well without cooling and stay sharp much longer. Most non-industrial users using hand driven drills blunt the HSS bit’s cutting edge because of uncontrolled feeding and imperfect alignment. But they are brittle, and if you’re not real careful they tend to break.įor home and DIY use, cobalt bits have better “hot” hardness. Ĭobalt will do everything HSS will do and more. As long as you keep them sharp it’s a reasonable investment.You can generally use HSS bits and when a stainless job comes up, you get cobalt for those jobs. Investment.A good HSS bits are fine if they are from a quality source. High-quality HSS bits work nice and precise and reliable. You can drill with them plastic and wood too, but cobalt bits are more brittle than regular HSS ones, so you can easily break it. Using cutting fluid keeps the bit cool and prolongs a lot the life of the bit.Ĭobalt drills are good for drilling tough materials: hardened and stainless steel. You need to sharpen bits with a bench grinder, or better a drill doctor. HSS drill bits are good for drilling in materials such as plastic, wood, and mild steel. Drilling with dull bits slows the process and causes overheating. Strength manufacturers add to alloys 5-8% cobalt. Drills made with the cobalt addition usually are called “cobalt drills”. A typical HSS alloy has: about 15% tungsten, 5% Chromium, 1% Vanadium, 0.7% carbon. HSS is a tool high carbon steel, containing a significant dose of tungsten. ![]() Cobalt alloys have good thermal weldability and fatigue resistance.Ĭobalt vs HSS Drill Bit Comparison Table HSS vs Cobalt – General Information.So cobalt drill bits better absorb stresses to higher absolute temperatures. Cobalt alloy has higher melting point than other HSS alloys.Cobalt alloys have high hot corrosion resistance.The cobalt-base superalloys have their origins in the Stellite® alloys patented in the early 1900’s by Elwood Haynes.Ĭobalt alloys are widely used because of such reasons: ![]() The performance of HSS tools can be further improved by application of the coating. HSS tools show nice toughness and capable of withstanding against the intermittent or cyclic loading. Our HSS vs cobalt drill bit comparison we’ll begin with the assertion that the “cobalt bits” are one of the types of HSS – High Speed Steel bits.
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