Here, according to Moh’s scale, the ability to squeeze something of unknown hardness compared to things of known hardness is tested.Ĭobalt drill bits can be used particularly successfully in soft materials as well as cutting through hard metals such as stainless steel and cast iron.Ĭobalt steel increases the strength of these bits and Heat-resistant. Moh’s scale is a simple concept that can be used to measure the hardness of something. When you use a cobalt drill bit, you can use below surface speed (SFM) for each metal Metal Surface Speed (SFM) Metal Surface Speed (SFM) Low Carbon Steel 110 High-Temperature Alloys 50 Medium Carbon Steel 65 Aluminum Alloys 325 Medium Carbon and Alloyed Steel 60 Brass 80 Tool and Die Steels 50 Bronze 80 Cast Iron (Soft grey) 105 Composite plastic 175 Cast Iron (grey) 90 Magnesium Alloys 325 Cast iron (ductile) 55 Titanium Alloys (Pure 99.0) 90 Titanium Alloys (C-3, C-4) SFM for cobalt drill bits for different materials.Īccording to Moh’s scale, cobalt is between 7-8. Therefore, this can be used for the heavy metal drilling process.Ĭobalt drill bits can be used to drill soft metals like aluminum and harder metals like cast iron, stainless steel, and titanium. And also, it can use even under high temperatures which generate due to the drilling process. UsageĪs mentioned before cobalt drill bit is also a harder type of drill bit. It depends on the sizes and numbers of the drill bits in the set.ĭepending on your needs, you can buy the most suitable cobalt drill bit set under the brands available in the market at a price range between $20 – $150.Įverything depends on the quality of the drill bits. A single cobalt drill bit will cost about $10-$25 and a set will cost more than that. Market priceĬobalt drill bits are available in the market as a set and singles. Normally, cobalt is coated with TiN, TiCN, and TiAlN compounds in order to improve its physical properties. Otherwise, there was no external coating. The ambient look and dull gold color come from the heating process of the drill bit. When considering M35 and M42 bits, M42 is the hardest and tough one. When the cobalt includes 8%, it is called an M42 drill bit. When the cobalt percentage is 5% it is rated as M35 drill bits. When concerned with this topic, it has mainly two types of cobalt drill bits according to the percentage of Cobalt.Ĭobalt drill bits are made by combining HSS and Cobalt. This process gives an ambient look to the cobalt drill bit. The HSS drill bits with cobalt must heat to prepare the cobalt drill bit. When considering the color of the cobalt drill bit, the manufacturing steps should be examined. But when it is coated with black oxide or titanium coating, its color is related to the coating color. Normally, cobalt drill bits are dull gold in color.
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