5/16" x 12" Aircraft Length Black Oxide Drill Bit

Milwaukee 48-89-2773 — Product Description

The Milwaukee 48-89-2773 is a 5/16" x 12" Aircraft Length Black Oxide Drill Bit, designed for deep-reach drilling in metal, wood, and plastic.

This is part of Milwaukee’s Aircraft Length drill bit series, meaning the focus is not large hole size, but extended reach (12 inches long) for hard-to-access drilling locations.

Key Features

• 12-inch overall length – reaches deep into framing, studs, and assemblies
• 135° split point tip – starts on contact and prevents walking for accurate drilling
• Black oxide coating – reduces friction and improves corrosion resistance
• Parabolic flute design – improves chip removal for faster drilling
• 3-flat Secure-Grip shank – reduces slipping in the drill chuck

Specs

• Size: 5/16"
• Overall length: 12"
• Flute length: ~3-3/16"
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Use: Metal, wood, PVC, plastics

Best Uses

• Drilling deep through walls, studs, or framing
• Electrical, plumbing, and HVAC installations
• Running fasteners or conduit through thick assemblies
• Accessing recessed or obstructed drill points

Bottom Line

The 48-89-2773 is not a “large hole” drill bit like the S&D series you were seeing earlier—it’s a long-reach precision drill bit, built for situations where depth matters more than diameter.