HSS COBALT DRILL BIT CO.5%
An HSS Cobalt drill bit with 5% cobalt (often M35 grade) is a drill bit made from a high-speed steel alloy that includes 5% cobalt. This addition makes the bit significantly more resistant to heat and wear, giving it a longer lifespan and making it ideal for drilling through hard metals like stainless steel, cast iron, and alloyed steels. Key features include a 135° split point for self-centering and precision, and a precision-ground twist flute for efficient chip removal.
Key features and benefits
- Material composition: Made from an M35 high-speed steel alloy with 5% cobalt, which increases hardness and heat resistance.
- Applications: Designed to cut through hard materials, including stainless steel, hardened steel, cast iron, and other alloys. They can also be used on softer materials like aluminum, copper, plastic, and wood.
- Performance: Offers a longer tool life and can often drill at a higher speed than standard HSS bits.
- Design:
- 135° split point: Prevents the bit from “walking” and ensures a precise, self-starting hole.
- Precision-ground twist flute: Helps clear chips and particles away from the cutting edge for smoother operation and better lubricant distribution.
- Straight shank: Provides a firm grip in standard drill chucks for accurate centering.
Usage recommendations
- Speed: Use a lower speed, especially when drilling into stainless steel, to prevent overheating. A speed between 200 and 1000 RPM is often recommended depending on the bit diameter.
- Lubrication: Always use a cutting fluid, tapping oil, or even a water-based solution when drilling hard metals to further reduce heat and extend the bit’s life.
