Milwaukee Tool 48-20-5490 Rotary Hammer Drill Bit 6 in

Product Description

The MILWAUKEE TOOL 48-20-5490 is a carbide-tipped rotary hammer drill bit designed for heavy-duty core drilling and large-diameter hole making in concrete, masonry, and similar hard substrates. Built with a spline shank for positive engagement in compatible spline-drive rotary hammers, this bit delivers the torque transfer needed for 6-inch diameter work. The carbide-tipped cutting head provides durability against abrasive aggregate, while the 3-inch usable flute length channels debris away from the cutting face. At 22 inches overall length, it reaches depth in thick slabs and block walls. Licensed electricians, plumbers, and mechanical contractors reach for this bit when penetrating structural concrete for conduit, piping, or ductwork sleeves.

This bit is suited for commercial and industrial applications where large-diameter penetrations are required through reinforced or unreinforced concrete, block, and masonry. Typical install scenarios include sleeve penetrations for large conduit runs, drain and waste piping rough-ins through poured slabs, and structural penetrations for mechanical system tie-ins. The 6-inch diameter and 22-inch overall length make it a practical choice for production drilling where depth and bore size demand a dedicated rotary hammer setup rather than a standard drill.

Key Features

• 6-inch diameter carbide-tipped cutting head for large-bore penetrations in concrete and masonry
• Spline shank design for secure, high-torque engagement with spline-drive rotary hammers
• 3-inch usable flute length channels slurry and debris away from the cutting zone
• 22-inch overall length provides reach through thick slabs and CMU walls
• High speed steel body with carbide-tipped cutting edges for extended service life in abrasive materials

Compatibility

Designed for use with spline-drive rotary hammer tools that accept spline shank accessories. Verify your rotary hammer accepts spline shank bits before installation, as SDS-plus and SDS-max shanks are not compatible with spline-drive chucks.

Installation Notes

Installation and operation of this bit should be performed by a qualified tradesperson familiar with rotary hammer operation and applicable OSHA safety requirements for concrete drilling. Before drilling, verify the work area is clear of embedded conduit, rebar, or post-tension cables using a concrete scanner or rebar locator. Ensure the rotary hammer is powered off and the bit is fully seated and locked in the chuck before beginning. Use appropriate hearing and eye protection, and follow OSHA silica dust controls including wet drilling methods or vacuum dust extraction when required by site conditions.