The Greenlee 1/4-20NC Combination Drill/Tap Bit completes drilling, tapping, and deburring/countersinking in a single operation, significantly reducing labour time on electrical enclosure work, panel installations, and metal fabrication tasks. Its back-tapered design prevents thread damage from over-drilling, while the hardened high-speed steel construction outlasts carbon steel alternatives on mild steel, copper, brass, and aluminium up to 10-gauge. A quick-change hex shank ensures a secure, reliable connection with any standard power drill chuck.

Specifications

Material High Speed Steel
Material Thickness Up to 10 GA
Compatible Materials Mild Steel, Copper, Brass, Aluminium
Point Type Split Point with Web Thinning
Thread Size 1/4 in.
Thread Per Inch 20 TPI
Thread Type NC (National Coarse)