Chicago-latrobe 55447 Reduced Shank Drill Bit 47/64 in

Product Description

The CHICAGO-LATROBE 55447 is a reduced shank twist drill bit designed for portable drilling operations in metal, wood, and cast iron. It carries a 47/64 inch (0.7344 inch decimal) cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to fit standard 1/2 inch chucks even though the cutting diameter is larger. The tool is manufactured from high speed steel and features a 118-degree standard point angle suited for general-purpose drilling across a range of workpiece materials. Two spiral flutes in a regular helix configuration clear chips efficiently during the cut. A coated finish helps extend cutting life in everyday service conditions.

This drill bit is built for general-purpose portable drilling use by machinists, pipefitters, ironworkers, electricians, and maintenance technicians. The reduced shank design makes it practical for operators whose drill chuck capacity tops out at 1/2 inch but who need to cut holes larger than that shank size. Rated for primary use in wood and secondary use in alloy steel, carbon steel, and cast iron, it covers the mix of materials common to mechanical, structural, and general fabrication work. Right-hand cutting direction is standard for conventional drill operation.

Key Features

• 47/64 inch cutting diameter (0.7344 inch decimal) with 1/2 inch reduced shank for standard chuck compatibility
• 118-degree standard point angle for general-purpose entry into steel, cast iron, and wood
• High speed steel construction for durability across a range of workpiece materials
• Two-flute regular spiral design promotes chip evacuation during portable drilling
• Coated finish for added wear resistance in production and field use
• Right-hand cut, Series 190 — diameter tolerance held to +0.0000 to -0.0012 inches

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with 1/2 inch drill chucks. Suitable for drilling alloy steel, carbon steel, cast iron, and wood in portable drilling applications.

Installation Notes

Install the shank fully into a 1/2 inch capacity drill chuck and tighten securely before operation. De-energize and lock out any stationary drilling equipment before changing bits. Use appropriate cutting fluid when drilling ferrous metals to manage heat buildup and extend tool life. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point is damaged.