Milwaukee 48-20-3966 Sds-max 4-cutter Bit 1-1/8x21 in

Product Description

The MILWAUKEE ELECTRIC TOOL CORP 48-20-3966 is an SDS-Max 4-cutter rotary hammer drill bit designed for heavy-duty concrete and masonry boring. The 4-cutter carbide tip configuration accelerates material removal while extending bit life in demanding conditions. With an overall length of 21 inches and a working length of 17 inches, this bit reaches deep anchor holes and pass-through penetrations in concrete walls and slabs. It is sized at 1-1/8 inches in diameter. Electricians, HVAC contractors, plumbers, and general contractors reach for SDS-Max bits when working with full-size rotary hammers on commercial and industrial job sites.

This bit is suited for large-diameter hole drilling in reinforced and unreinforced concrete, block, and masonry. Typical applications include setting anchor rods, running conduit sleeves, installing pipe penetrations, and creating duct openings through concrete structural elements. The 21-inch overall length provides extra reach for drilling through thick walls or floors without repositioning. It is sold individually as a single unit.

Key Features

• 4-cutter carbide tip for faster drilling and extended service life in concrete and masonry
• 1-1/8 inch diameter bore for anchor and sleeve applications
• 21-inch overall length with 17-inch working length for deep-reach drilling
• SDS-Max shank for positive chuck engagement and efficient hammer energy transfer
• Compatible with full-size SDS-Max rotary hammers used in commercial and industrial applications

Compatibility

Designed for use with SDS-Max rotary hammers. Fits any tool accepting the standard SDS-Max shank interface.

Installation Notes

SDS-Max rotary hammer bits are installed and removed by licensed trades and experienced contractors using SDS-Max chuck tools — no wrench is required for bit changes. Always wear appropriate PPE including eye protection and hearing protection when operating rotary hammers. Confirm the work area is clear of embedded conduit, rebar, or utilities before drilling. Follow OSHA and applicable local safety codes for concrete drilling operations.

Technical Specifications

• Shank Type: SDS-Max
• Number of Cutters: 4
• Bit Diameter: 1-1/8 inches
• Working Length: 17 inches
• Overall Length: 21 inches
• Weight: 27 pounds
• Unit of Measure: EA
• Package Quantity: 9

Standard Information

• Brand: MILWAUKEE ELECTRIC TOOL CORP
• Manufacturer Part Number: 48-20-3966