Chicago-latrobe 55490 Reduced Shank Drill Bit 1-13/32 in

Product Description

The CHICAGO-LATROBE 55490 is a reduced shank twist drill bit designed for general-purpose drilling in portable and bench-mounted applications. The bit features a 1-13/32 inch (1.4062 inch decimal) cutting diameter paired with a 1/2 inch straight-cylindrical shank, allowing it to fit standard 1/2 inch chucks despite its larger cutting diameter. Constructed from high speed steel with a coated finish, the 55490 operates with a 118-degree standard point angle and a right-hand spiral flute configuration. It is suited for production shops, maintenance crews, and contractors who need to drill larger-diameter holes with a common chuck size.

This drill bit is built for portable drilling operations across a range of materials including wood, alloy steel, carbon steel, and cast iron. The 6 inch overall length and 3-1/8 inch flute length provide adequate chip clearance in moderate-depth holes. The Series 190 designation places it in CHICAGO-LATROBE's general-purpose line. Typical users include machinists, pipefitters, ironworkers, and general contractors who need reliable oversized hole capability without swapping to a larger chuck or drill press spindle.

Key Features

• Reduced shank design: 1-13/32 inch cutting diameter on a 1/2 inch shank for standard chuck compatibility
• High speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle for versatile general-purpose use
• Coated finish for improved wear resistance and reduced friction
• Right-hand cut with regular spiral flutes for efficient chip evacuation
• Two-flute configuration with a diameter tolerance of +0.0000 to -0.0015 inches for consistent hole sizing

Compatibility

Designed for use in portable drilling applications with standard 1/2 inch keyed or keyless chucks. Compatible with wood, alloy steel, carbon steel, and cast iron workpieces per manufacturer specifications.

Installation Notes

Installation and use should follow standard machine shop or field drilling safety practices. Secure the workpiece firmly before drilling to prevent rotation or movement. Ensure the drill press or portable drill is powered off and unplugged before inserting or removing the bit from the chuck. No coolant is required for this bit per manufacturer specs, but controlling feed rate and pressure will extend tool life, particularly in harder ferrous materials.