As a common cutting tool, drill bits must be made of steel to achieve the required hardness. But unlike the stainless steel knives of general kitchen knives, common drill materials are nothing more than HSS cobalt drill bit , tungsten steel drill bits, etc., and there are often so-called “cobalt drill bits” on the market. What does this mean?
Cobalt-containing drill bits are made of cobalt-containing high-speed steel. Cobalt-containing high-speed steel belongs to the “high-hard or super-hard high-speed steel category”. The addition of “cobalt” to ordinary high-speed steel materials can increase the hardness of the tool to HRc 66 degrees, and increase the red hardness (hot hardness) of the tool, thereby increasing the cutting speed and service life of the tool.
Commonly used drills for processing stainless steel are high-cobalt drills (m35 drills, m42 drills), among which m42 drills are the most cost-effective. Cemented carbide drill bits can also be used, but the price is higher.
The above is some understanding of cobalt drill bits, like wood auger drill bit , most of them have high hardness.