Chicago-latrobe 55451 Reduced Shank Drill Bit 51/64 in

Product Description

The CHICAGO-LATROBE 55451 is a reduced shank twist drill bit designed for general-purpose drilling in wood, alloy steel, carbon steel, cast iron, and similar materials. Built from high speed steel with a coated finish, it accepts a standard 1/2 inch chuck despite carrying a 51/64 inch cutting diameter, making it compatible with common portable drill equipment. The 118-degree standard point angle suits a wide range of material types and is a familiar geometry for trade and industrial users. With a 6 inch overall length and a 3-1/8 inch flute length, this bit handles moderate-depth holes in typical production and service applications.

The 55451 is suited for portable drilling operations across light industrial, maintenance, and construction environments. Its reduced shank design allows the larger cutting diameter to be used in 1/2 inch capacity chucks without requiring a dedicated large-capacity drill press. Typical users include machinists, pipefitters, ironworkers, and general maintenance technicians who need to drill through structural steel, cast iron components, or wood framing with standard portable equipment. It is a Series 190 bit from CHICAGO-LATROBE, a line aimed at general-purpose metalworking and mixed-material applications.

Key Features

• 51/64 inch cutting diameter with 1/2 inch reduced shank for use in standard portable drills
• High speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle for general-purpose drilling versatility
• Coated finish for improved wear resistance and chip evacuation
• Right-hand cut with 2-flute regular spiral geometry
• Diameter tolerance held to +0.0000 to -0.0012 inches for consistent hole sizing

Compatibility

Designed for use in 1/2 inch capacity portable drills and drill presses. Suitable for drilling wood, alloy steel, carbon steel, and cast iron per manufacturer application data.

Installation Notes

Install and remove this bit with the drill unplugged or the power source locked out. Secure the reduced shank firmly in the chuck and confirm full engagement before drilling. Use appropriate cutting fluid or coolant when drilling hard ferrous materials to extend bit life, noting that this bit is rated for dry operation. Inspect the cutting edges for wear or chipping before each use and replace when the point geometry is no longer intact.