Milwaukee Tool 48-20-7990 Sds-plus Carbide Drill Bit

Product Description

The MILWAUKEE TOOL 48-20-7990 is a carbide-tipped SDS-Plus rotary hammer drill bit engineered for masonry drilling applications. With a 3/16-inch drill diameter, a 4-inch flute length, and a 6-inch overall length, this bit is sized for anchor holes, fastener penetrations, and conduit routing through concrete, block, and brick. The SDS-Plus shank provides positive engagement in any SDS-Plus compatible rotary hammer, eliminating slippage under load. The carbide cutting tip resists wear and thermal breakdown in abrasive masonry materials. This is a trade-use bit suited for electricians, plumbers, and HVAC technicians who regularly drill concrete or block substrates during installation work.

This bit is designed for use in light to medium masonry drilling tasks common in residential and commercial construction and mechanical rough-in work. Typical applications include setting concrete anchors for equipment hangers, drilling penetrations for pipe and conduit sleeves, and creating chase holes in CMU block walls. The 3/16-inch diameter is a common size for tapcon-style anchors and small-bore penetrations. This bit ships as a single unit and is available in a 100-piece pack quantity, making it appropriate for contractor restocking or tool crib replenishment.

Key Features

• Carbide cutting tip for extended service life in concrete, brick, and block
• SDS-Plus shank for positive chuck engagement and efficient hammer energy transfer
• 3/16-inch cutting diameter suits common masonry anchor and penetration applications
• 4-inch flute length provides efficient debris clearance during rotary hammer operation
• 6-inch overall length allows reach through standard wall assemblies and block courses
• Lightweight at 0.05 pounds per bit for reduced fatigue during extended drilling tasks

Compatibility

Designed for use with any SDS-Plus rotary hammer accepting the standard SDS-Plus shank profile, which is the dominant chuck format across professional-grade rotary hammers in the trade market.

Installation Notes

Installation of this bit requires a rotary hammer set to hammer-drill mode; use in a standard drill-only mode is not recommended and may damage the bit or tool. Always wear eye protection and a dust respirator when drilling masonry, as silica-bearing dust is a respiratory hazard subject to OSHA standards. Verify the drilling path is clear of embedded conduit, rebar, or post-tension cables before drilling, using a scanning tool where required. Allow the bit to cool between extended drilling sequences to preserve carbide tip integrity.