Disston Company 691220 Masonry Drill Bit 5/16 X 6 Inches

Product Description

The DISSTON COMPANY 691220 is a rotary percussion masonry drill bit designed for use in drills with rotary or hammer mode. Measuring 5/16 inches in diameter and 6 inches in length, it features a carbide-tipped cutting end and a black oxide finish. The carbide tip delivers hardness and edge retention when driving through dense masonry materials. The black oxide coating reduces friction and helps resist corrosion during wet or dry drilling. This bit is suited for HVAC, electrical, and plumbing trades that regularly drill through masonry walls, block, and tile for conduit, pipe, and equipment anchor points.

This bit is recommended for drilling cinder block, common brick, hard brick, plaster, ceramic tile, and glazed tile. It also handles wet or dry concrete in standard applications. For moderate use, it can be run through marble, granite, and concrete rated above 6000 psi. Typical applications include anchor hole drilling for mounting equipment, running conduit through block walls, and setting fasteners in masonry construction.

Key Features

• Carbide-tipped cutting edge for durability in hard masonry materials
• Black oxide finish reduces friction and resists corrosion
• Compatible with both rotary and hammer mode drills
• 5/16 inch diameter by 6 inch length for reach in standard masonry applications
• Rated for wet or dry concrete drilling
• Suitable for moderate use in high-strength concrete over 6000 psi, marble, and granite

Compatibility

Designed for use in standard drills with rotary or hammer mode. Recommended for cinder block, common brick, hard brick, plaster, ceramic tile, glazed tile, and wet or dry concrete. Moderate use is appropriate for marble, granite, and concrete over 6000 psi.

Installation Notes

This bit is typically installed by electricians, plumbers, HVAC technicians, and general contractors when anchoring equipment or routing systems through masonry. Wear appropriate eye and respiratory protection when drilling masonry, as dust and debris are generated. Use hammer mode for concrete and block, and rotary mode for tile and softer masonry to reduce the risk of cracking. Allow the bit to cool periodically during extended drilling to preserve tip integrity.