Milwaukee 48-20-4053 Spline Drill Bit 1/2 in 2-cutter

Product Description

The MILWAUKEE 48-20-4053 is a spline-shank rotary hammer drill bit built for drilling into brick, block, and concrete. The 2-cutter head geometry accelerates material removal and reduces bit walking on hard masonry surfaces. At 1/2 inch in diameter and 27 inches in overall length, it provides a 22-inch drilling depth — enough reach for through-wall anchor installations and deep structural penetrations. Licensed electricians, plumbers, HVAC technicians, and general contractors reach for this bit when setting anchors, running conduit sleeves, or boring chase openings through CMU and poured concrete.

This bit is suited for residential and commercial masonry applications where a spline-drive rotary hammer is the specified tool. Typical use cases include setting threaded rod anchors in block foundation walls, boring through brick veneer for pipe or conduit penetrations, and drilling concrete deck slabs for mechanical fasteners. The spline shank interface delivers higher torque transfer than SDS-Plus, making it the preferred choice on larger rotary hammers used in heavy commercial work.

Key Features

• 1/2 inch diameter with a 2-cutter carbide head for efficient masonry penetration
• Spline shank for high-torque transfer in full-size rotary hammer chucks
• 22-inch drilling depth supports deep anchor and through-wall applications
• 27-inch overall length reduces the need to reposition on thick walls
• Sold individually (each)

Compatibility

Designed for use with spline-drive rotary hammers. Verify your rotary hammer accepts a spline shank before installation — spline bits are not compatible with SDS-Plus or SDS-Max chucks.

Installation Notes

This bit is installed and used by licensed tradespeople and experienced contractors operating spline-drive rotary hammers. Always disconnect the hammer from its power source before changing bits. Wear appropriate PPE including eye protection and hearing protection when drilling masonry. Follow OSHA silica dust control requirements when drilling concrete or masonry, including wet drilling methods or vacuum shrouds as applicable.

Technical Specifications

• Shank Type: Spline
• Diameter: 1/2 inch
• Overall Length: 27 inches
• Drilling Depth: 22 inches
• Cutter Head: 2-cutter
• Weight: 1.3 pounds
• Sold As: Each
• UPC: 0045242102433

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-20-4053