Chicago-latrobe 55434 Reduced Shank Drill Bit 17/32 in Hss

Product Description

The CHICAGO-LATROBE 55434 is a reduced shank twist drill bit designed for general-purpose drilling in metal, wood, and cast iron. The bit measures 17/32 inches (0.5312 inches decimal) in cutting diameter and steps down to a 1/2-inch straight-cylindrical shank, allowing it to fit standard 1/2-inch chuck capacity drills even when the cut diameter is larger. Constructed from high speed steel with a coated finish, it runs a 118-degree standard point angle and a regular spiral flute geometry. Overall length is 6 inches with a 3-1/8-inch flute length, giving adequate chip clearance across a wide range of stock thicknesses. This bit is sold individually.

The 55434 is suited for portable drilling applications in both shop and field environments. Its reduced shank design makes it practical when a full-shank bit of this diameter would exceed the chuck capacity of a standard 1/2-inch drill. Compatible workpiece materials include wood, alloy steel, carbon steel, and cast iron, making this bit useful across HVAC, plumbing, electrical, and general mechanical trades where larger-diameter holes are required through structural or sheet materials.

Key Features

• 17/32 inch cutting diameter (0.5312 inches decimal) with a 1/2-inch reduced shank for standard chuck compatibility
• High speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle with regular spiral flute for general-purpose performance
• Coated finish helps reduce friction and heat buildup during drilling
• Right-hand cut with 2 spiral flutes and a 3-1/8-inch flute length for efficient chip evacuation
• Diameter tolerance held to +0.0000 to -0.0012 inches for consistent hole sizing

Compatibility

Designed for use with 1/2-inch chuck portable drills. Suitable for drilling wood, alloy steel, carbon steel, and cast iron. Part of the Chicago-Latrobe Series 190 reduced shank drill bit line.

Installation Notes

Secure the 1/2-inch shank fully into the drill chuck before use and verify the chuck is tightened evenly. No coolant is required per manufacturer specification, though reducing feed pressure on harder materials such as cast iron will extend bit life. Ensure the workpiece is clamped or secured before drilling to prevent rotation. Inspect the cutting edges for wear before each use, particularly when drilling abrasive or hardened materials.