Milwaukee Tool 48-20-3947 Sds-max Hammer Drill Bit 7/8 in

Product Description

The MILWAUKEE TOOL 48-20-3947 is a solid carbide SDS-Max rotary hammer drill bit engineered for heavy-duty concrete, masonry, and aggregate drilling applications. At 7/8 inch in diameter with a 29-inch overall length and a 24-inch flute length, this bit is built for deep-hole work where standard-length bits fall short. The SDS-Max shank provides positive engagement and efficient hammer energy transfer in compatible rotary hammer tools. Licensed HVAC technicians, plumbers, electricians, and general contractors rely on bits of this type when penetrating concrete slabs, CMU block, or structural walls during rough-in work. Solid carbide construction resists heat and abrasion better than carbide-tipped steel alternatives, extending service life under sustained impact loads.

This bit is suited for residential and commercial construction where deep anchor holes, sleeve penetrations, or conduit pathways must be bored through reinforced or unreinforced concrete. The extended 24-inch flute length allows cuttings to evacuate efficiently during deep passes, reducing bind-up and heat buildup. Electricians running large conduit through thick slabs and plumbers core-drilling for drain penetrations will find the reach and diameter practical for common rough-in scenarios. The bright uncoated finish keeps the cutting geometry visible and simplifies inspection after use.

Key Features

• 7/8 inch cutting diameter for standard anchor and sleeve penetration sizing
• Solid carbide construction for extended durability under high-impact rotary hammer use
• SDS-Max shank for positive chuck engagement and full hammer energy transfer
• 24-inch flute length promotes efficient debris evacuation on deep-hole drilling
• 29-inch overall length reaches through thick concrete slabs and walls
• Bright uncoated finish for easy inspection of cutting edge condition

Compatibility

Designed for use with SDS-Max rotary hammer tools. Verify that your rotary hammer accepts SDS-Max shank bits before installation, as SDS-Max and SDS-Plus shanks are not interchangeable.

Installation Notes

Installation requires an SDS-Max rotary hammer tool operated by a qualified tradesperson. Before inserting or removing the bit, ensure the tool is powered off and disconnected from its power source or battery pack. Insert the shank fully into the chuck until it seats and locks audibly. When drilling into concrete near existing conduit, rebar, or structural members, verify routing with applicable plans and use a rebar scanner where required by site conditions.