Milwaukee 48-20-4081 Spline Drill Bit 13/16x16 in 2-pack

Product Description

The MILWAUKEE 48-20-4081 is a spline-drive drill bit designed for heavy-duty rotary hammer drilling in concrete, masonry, and similar hard substrates. Sold as a 2-count pack, each bit measures 13/16 inch in diameter and 16 inches in length, giving drillers the reach needed for through-penetrations in block walls, foundations, and concrete slabs. The spline shank interface locks into compatible spline-drive rotary hammers, transferring maximum impact energy from the hammer to the bit with minimal slippage. This bit is a standard tool for licensed plumbers, electricians, HVAC technicians, and general contractors who need to core anchor holes or conduit penetrations through concrete structure.

This bit is suited for residential and commercial applications where spline-drive rotary hammer tools are the specified equipment. Typical uses include anchor bolt holes, conduit sleeves, pipe penetrations, and tie-rod openings in poured concrete or CMU block construction. The 16-inch length accommodates thicker walls and allows the operator to maintain a safe working distance from the surface during drilling. The 2-count pack supports job sites where a backup bit is standard practice.

Key Features

• 13/16 inch diameter delivers the bore size commonly required for anchor and conduit penetrations
• 16-inch overall length provides reach for thick concrete walls and block foundations
• Spline-drive shank interfaces with spline rotary hammers for efficient impact energy transfer
• 2-count pack included — one working bit plus one backup on the job
• Designed for rotary hammer use in concrete, block, and masonry applications

Compatibility

Designed as a replacement or job-site spline-drive bit for use with spline-interface rotary hammers in concrete and masonry drilling applications.

Installation Notes

Installation of this bit requires a spline-drive rotary hammer — confirm the hammer's chuck type before use. Always wear appropriate PPE including eye protection and hearing protection when operating rotary hammer equipment. Follow applicable OSHA and site safety protocols when drilling near rebar, conduit, or post-tension cable; verify wall contents before drilling. Inspect the bit shank and flutes for wear or damage before each use and replace if cracking or deformation is present.

Technical Specifications

• Diameter: 13/16 inch
• Length: 16 inches
• Shank Type: Spline Drive
• Quantity: 2 per pack
• Package Weight: 1.35 pounds
• Package Dimensions: 1.18 x 1.18 x 18.88 inches
• UPC: 0045242102716

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-20-4081