Milwaukee Core Drill Bit Extension 48-17-6012 12 Inch 5/8-11 Shank (Wet Dry Coring Deep Masonry Concrete Brick Stone Penetration Boring Adapter)

Milwaukee 48-17-6012 12" Diamond Core Bit Extension 5/8"-11

The Milwaukee 48-17-6012 12-inch diamond core bit extension expands drilling reach through thick concrete foundations, retaining walls, brick facades, and natural stone masonry during deep utility rough-ins. Precision-engineered with standard 5/8"-11 male and female threaded connections, this industrial extender bar maintains true axial alignment under high torque, preventing core bit wobble and binding during extended-depth drilling. Built from heavy-duty solid alloy steel and rated for both wet slurry flushing and dry dust-extraction operations, it equips commercial mechanical contractors, plumbers, and electricians with reliable penetration depth through dense structural substrates.

Best Used For:

• Deep Foundation and Footing Penetrations: Adding a full 12 inches of coring depth to pass through thick foundation footings, basement walls, and structural grade beams.
• Plumbing and Electrical Conduit Line Sleeving: Drilling continuous straight utility pass-through holes for water supply lines, electrical conduit, and drainage sleeves across multi-wythe brick and stone walls.
• Commercial Wet and Dry Core Drilling Operations: Extending reach on hand-held core drills or stand-mounted rigs across wet coring and dry masonry boring jobsites.

Key Performance & Safety Features

• 12-Inch Extended Working Depth: Provides an additional 12 inches of linear reach to clear deep barriers and thick structural slabs without losing rotational stability.
• Universal 5/8"-11 Thread Compatibility: Direct-thread male-to-female design connects seamlessly between standard 5/8"-11 drill spindles and diamond core bits.
• Dual Wet and Dry Operation: Fully rated for high-moisture slurry environments as well as high-temperature dry masonry and concrete coring applications.
• High-Torque Solid Alloy Steel Build: Machined steel construction resists rotational flexing, thread stripping, and impact deformation under heavy load.
• True Axial Precision Alignment: CNC-machined mating surfaces maintain accurate bit concentricity to prevent barrel runout and side-wall friction.

What's Included

• (1) Milwaukee 48-17-6012 Core Bit Extension – 5/8"-11 Threaded, 12" Length

Technical Specifications

Pro-Tip: Before attaching the extension to your core bit and drill rig, apply a thin coat of anti-seize lubricant to the 5/8"-11 threads; this prevents thread galling caused by high drilling heat and ensures easy bit disassembly after deep coring runs.