Milwaukee 7/8″ S&D Black Oxide Drill Bit

MAXIMUM TORQUE FOR LARGE-DIAMETER METAL BORING

When your application requires boring 7/8″ holes through stainless steel, cast iron, or high-tensile alloys, the Thunderbolt Silver & Deming series provides the mechanical advantage needed to maintain high-speed efficiency without stalling. Engineered with a 1/2″ reduced shank featuring three milled flats, this bit ensures maximum torque transfer from the drill chuck to the cutting edge, effectively eliminating the slippage that often plagues round-shank bits under heavy load. The parabolic flute geometry is a critical design element, aggressively clearing chips to prevent heat buildup and extending the service life of the industrial-grade steel in demanding production environments.

• / 135 Split Point Tip: Starts on contact to eliminate bit walking and the need for center punching in hard metals.
• / Parabolic Flute Geometry: Optimized for rapid chip ejection, keeping the bit cooler and maintaining cutting speed through deep holes.
• / 3-Flat Secure-Grip Shank: Provides a mechanical lock in the chuck to prevent bit spin-out during high-torque drilling operations.
• / Black Oxide Coating: Enhances lubricity and provides a protective barrier against corrosion and heat-related wear.
• / 1/2″ Reduced Shank: Allows for the use of large-diameter bits in standard 1/2″ drill/driver or drill press chucks.

TECHNICAL SPECIFICATIONS

WHAT’S IN THE BOX

(1) 7/8″ Thunderbolt Silver & Deming Drill Bit (48-89-2750)