Chicago-latrobe 53638 Reduced Shank Cobalt Drill Bit

Product Description

The CHICAGO-LATROBE 53638 is a reduced shank cobalt drill bit designed for portable drilling in ferrous metals and hard alloys. It features a 19/32 inch (0.5938 inch) cutting diameter on a 1/2 inch straight-cylindrical shank, allowing it to run in standard 1/2 inch chucks even though the cutting diameter exceeds that size. The 118-degree split point starts on contact without a center punch and reduces walking on flat stock. Overall length is 6 inches with a 3-1/8 inch flute length. Cobalt construction with a coated finish improves heat and wear resistance compared to standard high-speed steel, making it the appropriate choice when drilling cast iron, carbon steel, and alloy steel at elevated feed rates.

This bit is suited for job-site portable drilling and stationary drill press work in industrial and mechanical trade applications. Primary workpiece materials include cast iron and steel. Secondary materials include alloy steel, carbon steel, and cast iron. The regular spiral, two-flute geometry evacuates chips efficiently in through-hole and blind-hole operations. The Series 190C-TN designation identifies it within the CHICAGO-LATROBE cobalt reduced shank line, commonly used by machinists, pipefitters, ironworkers, and maintenance technicians who encounter oversized hole requirements with standard 1/2 inch chuck equipment.

Key Features

• Reduced shank design: 19/32 inch cutting diameter on a 1/2 inch shank for use in standard 1/2 inch chucks
• Cobalt tool material with coated finish for improved heat resistance and extended tool life in ferrous metals
• 118-degree split point for self-starting entry and reduced thrust on portable drills
• Right-hand cut, regular spiral, two-flute configuration for efficient chip evacuation
• Diameter tolerance held to +0.0000 to -0.0012 inches for consistent hole sizing
• General purpose rating suitable for cast iron, carbon steel, and alloy steel workpieces

Compatibility

Designed as a general-purpose reduced shank drill bit for use in portable drills and drill presses equipped with 1/2 inch chucks. Suitable for drilling cast iron, steel, alloy steel, and carbon steel in maintenance, fabrication, and construction trade applications.

Installation Notes

This bit is installed and operated by machinists, pipefitters, ironworkers, and general maintenance technicians. Secure the shank fully in the chuck and verify the set screw or chuck key is tightened before operation. Use appropriate cutting fluid or coolant when drilling hard alloys to extend tool life, noting this bit is rated for dry or wet use per application. Inspect the cutting edges before each use and do not force a dull bit, as cobalt bits can fracture under excessive lateral load.