Milwaukee 48-20-4370 Spline Drill Bit 1x16 in 4-cutter

Product Description

The MILWAUKEE 48-20-4370 is a spline-shank rotary hammer drill bit engineered for high-production drilling in concrete and masonry. It features a 4-cutter, 4 x 90-degree tip geometry designed to prevent lock-up when the bit contacts rebar. Patented rebar chamfers protect the cutting head and extend service life in reinforced concrete applications. A high-volume flute clears debris quickly, reducing heat buildup and maintaining penetration rate. At 1 inch in diameter and 16 inches in overall length with an 11-inch drilling depth, this bit handles deep anchor and sleeve installations that shorter bits cannot reach. It is installed by licensed concrete and masonry contractors, electricians, and mechanical trades using SDS-spline rotary hammer tools.

This bit is suited for residential and commercial applications where drilling through brick, block, standard concrete, and reinforced concrete is required. Typical uses include anchor bolt installation, conduit penetrations, mechanical sleeve placement, and structural attachment points. The spline shank provides positive drive engagement in SDS-spline rotary hammer chucks, making it a common choice on commercial job sites where production speed and bit durability are critical factors.

Key Features

• 4-cutter, 4 x 90-degree tip geometry prevents lock-up in rebar
• Patented rebar chamfers extend cutting head durability in reinforced concrete
• High-volume flute design promotes fast debris removal and reduced heat buildup
• 1 inch diameter with 11-inch drilling depth for deep anchor installations
• Spline shank for positive engagement in SDS-spline rotary hammer tools
• Rated for brick, block, concrete, and reinforced concrete

Compatibility

Designed for use with SDS-spline rotary hammer tools. Suitable for drilling brick, block, concrete, and reinforced concrete as an OEM-style production bit for trade applications.

Installation Notes

Install and remove this bit only with the rotary hammer powered off and the tool disconnected from its power source or battery removed. Verify the spline shank is fully seated and locked in the chuck before operation. Eye protection and hearing protection are required when operating rotary hammer equipment on concrete. Inspect the cutting head for carbide damage before each use and replace if chipping or wear is detected.

Technical Specifications

• Diameter: 1 inch
• Overall Length: 16 inches
• Drilling Depth: 11 inches
• Shank Type: Spline
• Cutter Configuration: 4-cutter head
• Application: Brick, block, concrete, reinforced concrete
• Weight: 1.71 pounds
• UOM: Each

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-20-4370