Milwaukee 48-20-4300 Spline Drill Bit 5/8 in 4-cutter

Product Description

The MILWAUKEE 48-20-4300 is a 5/8-inch, four-cutter spline shank rotary hammer drill bit designed for aggressive concrete and masonry drilling. The bit uses a 12-spline engagement system that mates with the drive system of a spline-drive rotary hammer, allowing near-direct transfer of impact energy from the hammer to the cutting face. Four carbide nibs are vacuum-brazed to a heat-treated steel body, creating cutting edges that simultaneously pulverize and rotate through concrete. Licensed electricians, plumbers, HVAC technicians, and general contractors use this bit when core-penetrating slabs or masonry walls during rough-in work.

This bit is suited for residential and commercial applications where a spline-drive rotary hammer is already in use. Typical scenarios include drilling anchor bolt holes, conduit or pipe penetrations through concrete block or poured slabs, and equipment-mounting applications in mechanical rooms. The 5/8-inch diameter and 10-inch overall length accommodate standard trade penetration depths in most wall and slab thicknesses. A drilling depth of 5 inches is achievable within the overall 10-inch length, leaving adequate shank engagement in the chuck.

Key Features

• 5/8-inch cutting diameter with a 4-cutter carbide head for efficient concrete pulverization
• 12-spline shank engagement maximizes energy transfer from spline-drive rotary hammers
• Carbide nibs are vacuum-brazed to a heat-treated steel body for durability under impact
• 5-inch drilling depth capacity within a 10-inch overall length
• Sold individually; compatible with spline-drive rotary hammer systems

Compatibility

Designed for use with spline-drive rotary hammers that accept a 12-spline shank interface. Milwaukee offers this bit series in diameters ranging from 5/8 inch to 1-1/2 inches, and in metric sizes from 16 mm to 38 mm.

Installation Notes

This bit is installed and used by trade professionals operating spline-drive rotary hammers. Before changing bits, disconnect the hammer from its power source or remove the battery pack. Ensure the bit is fully seated and locked in the chuck before beginning drilling. Wear appropriate personal protective equipment including eye protection and hearing protection when operating rotary hammer equipment.

Technical Specifications

• Cutting Diameter: 5/8 inch
• Cutter Configuration: 4-cutter head
• Shank Type: Spline (12-spline)
• Drilling Depth: 5 inches
• Overall Length: 10 inches
• Body Material: Heat-treated steel with vacuum-brazed carbide nibs
• Weight: 0.8 pounds
• UOM: Each

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-20-4300