Chicago-latrobe 55484 Reduced Shank Drill Bit 1-5/16 in

Product Description

The CHICAGO-LATROBE 55484 is a reduced shank twist drill bit designed for portable drilling applications in metal, cast iron, and wood. The bit features a 1-5/16 inch cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to chuck into standard 1/2 inch drill chucks without requiring a larger capacity machine. Manufactured from high speed steel with a coated finish, the 55484 delivers reliable cutting performance across general-purpose drilling tasks. The 118-degree standard point angle suits a wide range of common workpiece materials encountered in trade and fabrication work.

This drill bit is suited for use in portable drilling setups on jobsites and in shop environments. Typical applications include drilling through alloy steel, carbon steel, cast iron, and wood. The reduced shank design makes it practical for use with 1/2 inch chuck drills and drill presses where full-diameter shanks would not fit. It is a go-to choice for machinists, pipefitters, iron workers, and general contractors who need to bore large-diameter holes with standard equipment already on hand.

Key Features

• 1-5/16 inch cutting diameter with tolerance of +0.0000 to -0.0015 inches for consistent hole sizing
• Reduced 1/2 inch straight-cylindrical shank fits standard 1/2 inch drill chucks
• 118-degree standard point angle for general-purpose drilling across multiple materials
• High speed steel construction for durability in ferrous and non-ferrous materials
• Coated finish helps extend cutting edge life and reduces friction during drilling
• Right-hand cut with two-flute regular spiral geometry for efficient chip evacuation

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with portable drills and drill presses equipped with 1/2 inch drill chucks. Suitable for workpieces including alloy steel, carbon steel, cast iron, and wood.

Installation Notes

Installation and use of this drill bit is typically performed by machinists, fabricators, pipefitters, and general tradespeople. Secure the 1/2 inch shank firmly in the drill chuck before operation and verify the chuck is fully tightened. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life and reduce heat buildup. Always wear appropriate eye protection and secure the workpiece before drilling.