1/4 Cobalt Drill Bits for Hardened and Stainless Steel

Use a cobalt M35 bit with a 135-degree split point to prevent walking, run at a slow, steady speed with high downward pressure, and apply cutting fluid to manage heat. Starting with a center punch and using a pilot hole also improves accuracy and extends bit life.

Our cobalt drill bits are available in fractional sizes ranging from 1/8" to 1/2", including the 1/4" size popular for hardened and stainless steel applications. Both jobber length and step point styles are offered to suit different hole depth and sizing needs.

Jobber length bits are general-purpose tools ideal for standard depth holes in a single diameter, while step point bits feature a stepped tip that allows drilling multiple hole sizes with one bit. Step point designs are especially useful for sheet metal and multi-diameter fabrication work.

Yes, M35 cobalt drill bits are specifically formulated to handle the toughness and heat generated when drilling stainless steel. Their heat resistance and hardness outperform standard high-speed steel bits, resulting in cleaner holes and significantly longer tool life in stainless applications.

A 135-degree split point tip, like the one on our cobalt jobber bits, is self-centering and grips the material immediately, minimizing walking. Using a center punch to create a starting divot and applying steady, even pressure at the start of the cut also helps ensure accurate hole placement.

Yes, volume and custom pricing is available for shops and businesses with ongoing supply needs, including options through our GSA MAS Contract. Contact our sales team to discuss quantity discounts tailored to your operation's drilling requirements.