Disston Company 120139 Hss Black Oxide Drill Bit 1/2x6 in

Product Description

The DISSTON COMPANY 120139 is a high speed steel black oxide drill bit in jobber length configuration, designed for use in standard 3/8-inch chuck drills across a broad range of materials. The bit measures 0.5 inches in diameter and 6 inches in overall length, with a 135-degree split-point tip featuring four cutting edges. The four-edge point geometry eliminates walking on contact, reducing the need for a center punch on most surfaces. The black oxide tempering treatment lowers frictional resistance during drilling and promotes efficient chip evacuation. Licensed contractors, maintenance technicians, and trade professionals reach for this bit when working through wood, plastic, wallboard, and soft metals in both new construction and repair applications.

This bit is recommended for use in wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze. It is suited for occasional use in stainless steel and other hard metals. The jobber length format fits standard drill chucks and works with benchtop drill presses and handheld drills alike. It is appropriate for residential and light commercial work where a reliable general-purpose bit is required across mixed-material tasks on the same job site.

Key Features

• 135-degree split-point with four cutting edges eliminates bit walking on contact
• Black oxide tempering treatment reduces friction and improves chip flow
• High speed steel construction handles wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze
• Suitable for occasional use in stainless steel and other hard metals
• Jobber length format compatible with standard 3/8-inch shank drill chucks
• 0.5-inch diameter with 6-inch overall length for reach in confined or standard access conditions

Compatibility

Designed as an OEM-style jobber-length drill bit compatible with standard 3/8-inch chuck handheld drills and benchtop drill presses for general-purpose trade use.

Installation Notes

This bit is installed and operated by carpenters, electricians, plumbers, HVAC technicians, and general maintenance personnel using standard corded or cordless drills with a 3/8-inch or larger chuck. Secure the workpiece before drilling to prevent movement and wear appropriate eye protection as required by site safety codes. Allow the bit to cool between extended cuts in harder materials to preserve temper and edge life. Do not force the bit through material at excessive feed pressure, particularly when drilling aluminum or stainless steel, as this accelerates edge wear.