Milwaukee Tool 48-20-5484 Rotary Hammer Drill Bit 4 in

Product Description

The MILWAUKEE TOOL 48-20-5484 is a carbide-tipped rotary hammer drill bit designed for heavy-duty core drilling and large-diameter hole applications in concrete, masonry, and similar hard materials. Built with a spline shank for positive engagement with compatible rotary hammer chucks, this bit delivers consistent torque transfer under load. The carbide-tipped cutting face handles the abrasion and impact demands of demolition and new-construction drilling. At 4 inches in diameter with a 3-inch usable flute length and a 22-inch overall length, it reaches deep into walls, slabs, and footings where standard bits fall short. Skilled tradespeople in electrical, plumbing, HVAC, and structural work rely on this size for conduit and pipe penetrations.

This bit is suited for commercial and residential construction where large-diameter penetrations are required through concrete block, poured concrete, or masonry walls. Typical applications include core drilling for plumbing stub-outs, large conduit runs, HVAC ductwork penetrations, and similar through-wall openings. The 22-inch overall length provides reach for thick foundation walls and deep structural members without requiring an extension.

Key Features

• Carbide-tipped cutting face for durability in concrete and masonry drilling
• Spline shank provides secure, positive engagement in spline-drive rotary hammer chucks
• 4-inch diameter for large conduit, pipe, and duct penetration work
• 3-inch usable flute length for effective debris clearing during drilling
• 22-inch overall length for extended reach into thick walls and slabs
• High speed steel body construction supports repeated heavy-impact use

Compatibility

Designed for use with spline-drive rotary hammer drills. Verify that the host tool accepts spline shank accessories before installation.

Installation Notes

Installation and use of this bit should be performed by qualified tradespeople familiar with rotary hammer operation and concrete drilling procedures. Disconnect power to the rotary hammer before inserting or removing the bit from the chuck. Wear appropriate PPE including eye protection and hearing protection during drilling operations. Follow applicable OSHA and local safety codes when drilling into structural concrete or masonry.