Chicago-latrobe 55438 Reduced Shank Drill Bit 19/32 in Hss

Product Description

The CHICAGO-LATROBE 55438 is a reduced shank twist drill bit designed for general-purpose portable drilling in metal, wood, and cast iron. The bit carries a 19/32-inch (0.5938 inches) cutting diameter with a reduced 1/2-inch straight-cylindrical shank, allowing it to seat in standard 1/2-inch chucks even though the cutting diameter exceeds that size. Ground from high speed steel (HSS) with a coated finish for added wear resistance, the 55438 features a 118-degree standard point angle and a right-hand spiral flute geometry suited to a wide range of workpiece materials. It belongs to the Chicago-Latrobe Series 190 line and is typically installed by machinists, maintenance mechanics, ironworkers, and general contractors.

The 55438 is built for portable drilling applications across residential and light industrial settings. Its reduced shank design makes it practical when larger-diameter drilling is needed without swapping to a larger chuck. Suitable workpiece materials include wood, alloy steel, carbon steel, and cast iron. The two-flute regular spiral configuration clears chips efficiently during through-hole and blind-hole operations. With a 6-inch overall length and 3-1/8-inch flute length, the bit reaches deeper setups while maintaining rigidity.

Key Features

• Reduced shank design: 19/32-inch cutting diameter fits a standard 1/2-inch chuck
• High speed steel construction for durability across steel, cast iron, and wood
• 118-degree standard point angle for general-purpose drilling
• Right-hand cut with regular spiral two-flute geometry for efficient chip evacuation
• Coated finish extends tool life and reduces friction at the cutting edge
• Diameter tolerance held to +0.0000 to -0.0012 inches for consistent hole sizing

Compatibility

Designed as an OEM-style replacement or direct substitute for Series 190 reduced shank drill bits used in 1/2-inch chuck portable drills and drill presses across general-purpose metalworking and woodworking applications.

Installation Notes

Installation is performed by machinists, maintenance technicians, or experienced tradespeople using a drill press or portable drill with a 1/2-inch keyed or keyless chuck. Secure the shank fully in the chuck before operation and confirm the chuck is tightened evenly. No coolant is specified for this bit; follow shop safety protocols regarding eye protection and workpiece clamping. Inspect the cutting edges before use and replace the bit if chipping or excessive wear is observed.