Chicago-latrobe 55472 Reduced Shank Drill Bit 1-1/8 in

Product Description

The CHICAGO-LATROBE 55472 is a reduced shank twist drill bit built from high speed steel for general-purpose portable drilling applications. It features a 1-1/8 inch cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to fit standard 1/2 inch chucks even at larger bit diameters. The 118-degree standard point angle suits a wide range of materials. Overall length is 6 inches with a 3-1/8 inch flute length and a coated finish that helps extend service life. This is a right-hand cut, two-flute spiral bit from the Series 190 lineup, suited for tradespeople and shop technicians who need reliable performance at larger bore sizes.

This bit is designed for portable drilling in field and shop environments. Primary workpiece material is wood, with secondary capability across alloy steel, carbon steel, cast iron, and wood. The reduced shank design makes it practical for use with standard 1/2 inch drill chucks when boring larger-diameter holes, eliminating the need for a larger chuck or specialized tooling. It is a single-piece per package item appropriate for HVAC, plumbing, electrical, and general mechanical trades where larger-diameter bore work is required during installation or retrofit tasks.

Key Features

• 1-1/8 inch cutting diameter with a reduced 1/2 inch straight-cylindrical shank for use in standard drill chucks
• High speed steel construction for durability across metal, wood, and cast iron workpieces
• 118-degree standard point angle for general-purpose entry performance
• Coated finish to help resist wear and extend bit life
• Right-hand cut, two-flute regular spiral geometry for efficient chip evacuation
• 6 inch overall length with 3-1/8 inch flute length for adequate reach in portable drilling setups

Compatibility

Designed for use with standard 1/2 inch drill chucks in portable and bench-mounted drilling applications. Suitable for workpieces in wood, alloy steel, carbon steel, and cast iron as noted in manufacturer specifications.

Installation Notes

Secure the reduced shank firmly in the chuck before drilling and verify the chuck key is removed prior to operation. Always wear appropriate eye protection and secure the workpiece to prevent movement during drilling. For metal workpieces, use a center punch to establish a starting point and apply cutting fluid where appropriate to manage heat buildup. When boring through harder materials such as cast iron or alloy steel, use controlled feed pressure to avoid bit deflection or premature dulling.