Chicago-latrobe 55474 Reduced Shank Drill Bit 1-5/32 in

Product Description

The CHICAGO-LATROBE 55474 is a reduced shank twist drill bit designed for general-purpose portable drilling in metal, wood, and cast iron. The cutting diameter measures 1-5/32 inches (1.1562 inches decimal) while the shank reduces to 1/2 inch, allowing the bit to fit standard 1/2-inch chucks despite its larger cutting diameter. Built from high speed steel with a coated finish, the 55474 carries a 118-degree standard point angle and a right-hand spiral flute geometry. Overall length is 6 inches with a 3-1/8-inch flute length. Series 190 construction targets demanding production and field drilling environments.

This bit is suited for portable drilling operations across residential, commercial, and light industrial applications. It handles a broad range of workpiece materials including wood, alloy steel, carbon steel, and cast iron. The reduced shank design makes it practical for use with 1/2-inch chuck drills and drill presses where a full 1-5/32-inch shank would not fit. Two spiral flutes clear chips efficiently during through-hole and blind-hole drilling. No coolant system is required for typical use cases within this bit's intended application range.

Key Features

• Cutting diameter of 1-5/32 inches (1.1562 inches) with a reduced 1/2-inch straight-cylindrical shank
• 118-degree standard point angle for general-purpose entry and centering
• High speed steel construction handles alloy steel, carbon steel, cast iron, and wood
• Coated finish extends cutting edge life under repeated use
• Right-hand cut with regular spiral flutes for consistent chip evacuation
• 6-inch overall length with 3-1/8-inch flute length suits most portable and bench drill setups

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with any 1/2-inch chuck portable drill or drill press. Suitable for drilling wood, alloy steel, carbon steel, and cast iron workpieces per Series 190 specifications.

Installation Notes

Install and remove this bit with the drill or drill press fully powered off and unplugged. Secure the 1/2-inch shank firmly in the chuck and verify there is no runout before beginning a cut. Use appropriate personal protective equipment including eye protection when drilling metal or cast iron. Follow applicable OSHA and shop safety guidelines for rotating cutting tools.