Eagle Cutting Tool AC712-028-I Cobalt Aircraft Drill 7/16 X 12 in

Product Description

The EAGLE CUTTING TOOL AC712-028-I is a cobalt aircraft extension drill bit designed for drilling through metal in tight or deep-reach applications. With a 7/16-inch diameter and a 12-inch overall length (OAL), this bit provides the extended reach required for structural and mechanical work where standard-length drills cannot access the bore location. The cobalt construction offers improved heat and wear resistance compared to standard high-speed steel, making it suitable for harder metals encountered in HVAC, sheet metal, and mechanical contracting work. Trade professionals including HVAC installers, sheet metal workers, and pipefitters keep extended cobalt bits on hand for field drilling tasks.

This drill bit is suited for applications requiring deep-reach drilling in ferrous and non-ferrous metals. Common uses include drilling through structural framing, HVAC duct supports, electrical enclosures, and plumbing hangers where the work surface is recessed or obstructed. The 12-inch OAL gives the operator clearance to drill through assemblies without interference from surrounding structure. It is appropriate for both shop and field use in residential and light commercial trade work.

Key Features

• Cobalt construction resists heat buildup during extended drilling in hard metals
• 7/16-inch diameter suits common structural and mechanical hole sizes
• 12-inch overall length provides deep-reach access in confined or obstructed areas
• Import-grade pricing suitable for high-turnover field use

Compatibility

Designed as a standard shank aircraft extension cobalt drill bit compatible with 3/8-inch and 1/2-inch chuck portable drills and drill presses accepting reduced or straight-shank bits of this diameter.

Installation Notes

Use with a variable-speed drill and apply consistent feed pressure to avoid work hardening when drilling harder alloys. Secure the workpiece before drilling to prevent movement and bit breakage. Wear appropriate eye protection per OSHA general industry standards. Allow the bit to cool between extended drilling cycles to preserve the cutting edge.

Technical Specifications

• Diameter: 7/16 inches
• Overall Length (OAL): 12 inches
• Material: Cobalt
• Weight: 0.24 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: AC712-028-I