Disston Company 504662 Extra Length Hss Drill Bit 3/16x12in

Product Description

The DISSTON COMPANY 504662 is a 3/16-inch by 12-inch extra-length high speed steel drill bit finished with a black oxide coating. The 135-degree split-point tip features four cutting edges that prevent walking on contact and allow fast penetration without a center punch. Black oxide tempering reduces frictional heat and improves chip evacuation during drilling. The extended 12-inch length reaches into deep cavities, wall assemblies, and structural members that standard-length bits cannot access. Licensed tradespeople and experienced DIYers working on rough-in and retrofit applications will find the extra reach especially useful when drilling through framing, conduit runs, and layered materials.

This bit is suited for drilling wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze. It handles occasional use in stainless steel and other hard metals. Typical applications include electrical and plumbing rough-in through deep framing members, HVAC ductwork penetrations, and general construction tasks where a standard-length bit falls short. The carded single-bit packaging makes it convenient for job-site procurement.

Key Features

• 135-degree split-point tip with four cutting edges prevents walking and eliminates the need for a center punch
• Extra length at 12 inches reaches deep framing, wall cavities, and stacked material assemblies
• High speed steel construction provides durability across wood, plastic, and metal substrates
• Black oxide tempering treatment reduces frictional resistance and improves chip flow during drilling
• Recommended for wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze
• Suitable for occasional use in stainless steel and other hard metals

Compatibility

Designed as an OEM-style replacement and general-use extra-length drill bit compatible with standard 3/8-inch and 1/2-inch keyed or keyless drill chucks accepting 3/16-inch round shanks.

Installation Notes

This bit is installed and used by electricians, plumbers, HVAC technicians, and general contractors. Always disconnect power at the panel or de-energize the work area before drilling near electrical components. Secure the workpiece before drilling, use appropriate eye protection, and reduce feed pressure when transitioning between material layers to prevent bit deflection. Consult NEC or IFGC clearance requirements when drilling through structural or fire-rated assemblies.