Disston Company 504696 Extra Length Hss Drill Bit 3/8x12

Product Description

The DISSTON COMPANY 504696 is a 3/8-inch by 12-inch extra-length high speed steel drill bit with a black oxide finish. It features a 135-degree split-point tip with four cutting edges that prevent walking on contact and deliver fast penetration without a center punch. The black oxide tempering treatment lowers frictional heat and improves chip evacuation during the cut. At 12 inches in length, this bit is built for deep-hole drilling and reach applications where standard-length bits fall short. Electricians, plumbers, HVAC techs, and general contractors rely on extended-length bits like this for boring through framing, structural members, and thick assemblies.

This bit is suited for use in wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze. It can be used occasionally in stainless steel and other hard metals, though it is not optimized for continuous hard-metal applications. Typical install scenarios include running conduit through framing, drilling penetrations for pipe or flex duct, and general mechanical rough-in work where depth of cut exceeds the reach of a standard jobber-length bit.

Key Features

• 135-degree split-point tip with four cutting edges eliminates walking and reduces the need for a center punch
• 12-inch extra length provides reach for deep-hole and through-framing applications
• High speed steel construction handles a wide range of materials including wood, plastic, and soft metals
• Black oxide tempering treatment reduces friction and improves chip flow for cleaner cuts
• 3/8-inch diameter suits standard 3/8-inch and larger drill chucks

Compatibility

Designed for use with standard drill chucks accepting a 3/8-inch shank. Suitable for wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze, with occasional use in stainless steel and other hard metals.

Installation Notes

This bit is installed and used by electricians, plumbers, HVAC technicians, and carpenters performing rough-in drilling. Secure the bit firmly in the chuck before use and verify the chuck key is removed before powering the drill. Use appropriate speeds for the material being drilled — lower speeds for metals, higher speeds for wood and plastics. Wear eye protection and ensure the workpiece is secured to prevent movement during drilling.