Milwaukee 48-20-4087 Spline Drill Bit 7/8 in 16 in 2-cutter

Product Description

The MILWAUKEE 48-20-4087 is a spline-shank rotary hammer drill bit engineered for heavy-duty drilling into brick, concrete block, and poured concrete. The 2-cutter head geometry accelerates material removal and helps clear debris from the hole during operation. At 7/8 inch in diameter and 16 inches in overall length, this bit provides a 10-inch drilling depth, making it well suited for through-bolt anchoring, rebar clearance holes, and deep anchor work in masonry. Licensed tradespeople working in commercial and residential concrete applications will find the spline drive connection delivers reliable torque transfer without bit slippage.

This bit is intended for use with spline-drive rotary hammer tools in SDS-spline chuck configurations. Typical applications include drilling anchor holes in concrete block walls, setting sleeve anchors or wedge anchors in poured slabs, and core-adjacent penetrations in masonry construction. The 10-inch drilling depth accommodates standard through-wall anchor depths in many commercial block wall assemblies. It is sold as a 2-count pack, providing a backup bit on the job without requiring a separate order.

Key Features

• 7/8 inch diameter with 2-cutter head for efficient masonry penetration
• Spline shank for positive drive engagement in spline-drive rotary hammers
• 10-inch drilling depth supports deep anchor and through-bolt applications
• 16-inch overall length for extended reach in tight or deep setups
• Sold as a 2-count pack for job-site continuity

Compatibility

Designed for use with spline-drive rotary hammer tools accepting standard spline-shank accessories. Confirm your rotary hammer accepts the spline chuck format before installation.

Installation Notes

Spline-drive rotary hammer bits should be installed and removed only after the tool is powered off and the chuck is fully disengaged. Always wear appropriate eye and respiratory protection when drilling into concrete or masonry, as silica dust is a recognized health hazard subject to OSHA Table 1 controls. Use the rotary-hammer mode appropriate for the substrate and avoid applying side pressure to the bit, which can cause breakage or premature wear. Inspect the bit for carbide tip damage before each use.

Technical Specifications

• Diameter: 7/8 inch
• Overall Length: 16 inches
• Drilling Depth: 10 inches
• Shank Type: Spline
• Cutter Head: 2-Cutter
• Weight: 1.43 pounds
• Pack Quantity: 2
• UPC: 0045242102778

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-20-4087