Milwaukee 48-20-4400 Spline Rotary Hammer Drill Bit

Product Description

The MILWAUKEE 48-20-4400 is a spline-shank rotary hammer drill bit engineered for drilling into brick, block, concrete, and reinforced concrete. It uses a 4-cutter tip with a 4 x 90-degree geometry that reduces lock-up when the bit contacts rebar. The patented rebar chamfers extend service life under demanding field conditions. A high-volume flute design moves debris out of the hole quickly, keeping the cutting tip cool and reducing bit walking. This bit is installed by licensed contractors, concrete specialists, and experienced tradespeople working on structural or masonry drilling applications.

This bit is suited for residential and commercial masonry work where spline-drive rotary hammers are the standard tool of choice. It delivers a 17-inch drilling depth with a 22-inch overall length, giving adequate reach for through-slab and deep anchor applications. The 1-1/4-inch diameter accommodates common anchor bolt and conduit sleeve hole requirements on job sites. Applications include concrete formwork, anchor setting, core layout, and reinforced slab penetration.

Key Features

• 4-cutter tip with 4 x 90-degree geometry resists lock-up in rebar
• Patented rebar chamfers increase cutting edge durability
• High-volume flute promotes fast debris evacuation from the hole
• 1-1/4-inch cutting diameter suitable for anchor and sleeve installations
• Spline shank for secure chuck engagement in spline-drive rotary hammers
• 17-inch usable drilling depth with 22-inch overall length for deep-reach applications

Compatibility

Designed for use with spline-drive rotary hammer tools. Compatible with rotary hammers equipped with a spline chuck interface, which is common on mid- to heavy-duty hammer drills used in commercial and industrial masonry work.

Installation Notes

This bit is installed and operated by qualified tradespeople familiar with rotary hammer equipment and masonry drilling procedures. Confirm the rotary hammer is set to the correct mode (rotary hammer, not rotation-only) before drilling into concrete or reinforced masonry. Always wear appropriate PPE including eye protection and hearing protection. Inspect the bit shank and cutting edges for wear or damage before each use and replace if chipping or deformation is observed.

Technical Specifications

• Cutting Diameter: 1-1/4 inches
• Overall Length: 22 inches
• Drilling Depth: 17 inches
• Shank Type: Spline
• Cutter Count: 4
• Weight: 2.99 pounds
• UOM: Each

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-20-4400