Chicago-latrobe 55448 Reduced Shank Drill Bit 3/4 in Hss

Product Description

The CHICAGO-LATROBE 55448 is a reduced shank twist drill bit engineered for general-purpose portable drilling in metal, wood, and cast iron. The bit carries a 3/4 inch cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to fit standard 1/2 inch chucks while drilling full 3/4 inch holes. Constructed from high speed steel with a coated finish, it holds an edge through repeated use in production and field environments. The 118-degree standard point angle suits a wide range of workpiece materials. A 2-flute right-hand spiral flute design clears chips efficiently throughout the 3-1/8 inch flute length.

This bit is intended for portable drilling applications across residential and light commercial trade work. It is well suited for electricians, plumbers, HVAC installers, and general contractors who need to bore 3/4 inch holes through wood framing, mild steel, carbon steel, alloy steel, and cast iron. The reduced shank design makes it compatible with standard 1/2 inch chuck drills and drill presses without requiring a larger chuck size. Series 190 designation places this bit in Chicago-Latrobe's general-purpose line, appropriate for everyday jobsite and shop use.

Key Features

• 3/4 inch cutting diameter with diameter tolerance of +0.0000 to -0.0012 inches for consistent hole sizing
• Reduced 1/2 inch straight-cylindrical shank fits standard 1/2 inch chucks
• High speed steel construction with coated finish for extended tool life
• 118-degree standard point angle for general-purpose entry into multiple materials
• Right-hand cut with 2-flute regular spiral design for effective chip evacuation
• 6 inch overall length with 3-1/8 inch flute length suits deep-hole portable drilling

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with any 1/2 inch keyed or keyless chuck on portable drills and drill presses. Rated for use in wood, alloy steel, carbon steel, cast iron, and similar workpiece materials.

Installation Notes

Secure the 1/2 inch shank firmly in the chuck before drilling and verify the chuck is fully tightened to prevent slipping under load. Power down and disconnect or lock out the drill before changing bits. Use appropriate eye protection and secure the workpiece to prevent movement during drilling. When drilling metal, apply a cutting fluid or lubricant to the cutting edge to extend bit life and improve hole quality, unless the application restricts coolant use.