L H Dottie Co SDF138 Speed-d-feed Drill Bit 1-3/8 in

Product Description

The L H Dottie Co SDF138 is a 1-3/8 inch Speed-D-Feed self-feed drill bit designed for boring large, clean holes through wood framing and structural lumber. Self-feed bits use a center screw tip to pull the bit through material without requiring heavy axial pressure, making them a standard tool for electricians and plumbers drilling through joists, studs, and plates during rough-in work. The SDF138 is sold as a single bit and is sized at 1-3/8 inches, a diameter commonly required for conduit, pipe, and cable rough-in applications.

This bit is well suited for residential and light commercial rough-in installations where trade professionals need to bore through dimensional lumber, engineered lumber, or wood plate stock. Electricians use this diameter for running conduit or cable bundles through framing. Plumbers use it for drain, waste, and vent pipe rough-in through floor and wall framing. The 1-3/8 inch diameter accommodates a range of common pipe and conduit sizes in typical trade applications.

Key Features

• 1-3/8 inch cutting diameter sized for common conduit and pipe rough-in work
• Speed-D-Feed self-feed design pulls bit through material with minimal axial pressure
• Center screw tip provides positive feed and accurate hole placement
• Single-bit unit quantity for targeted replacement or kit supplementing

Compatibility

Designed as an OEM-style replacement or standard self-feed bit compatible with 1/2 inch chuck corded drills and right-angle drills commonly used in electrical and plumbing rough-in applications.

Installation Notes

Self-feed bits are installed and operated by licensed electricians, plumbers, and general trade contractors during rough-in framing stages. Always confirm that the drill chuck is fully tightened and rated for the bit shank diameter before operation. Inspect framing members for embedded nails, screws, or metal plates before drilling to avoid bit damage or kickback. Follow applicable NEC or IPC hole-spacing and edge-distance requirements when boring through structural framing members.