Chicago-latrobe 53448 Cobalt Drill Bit 3/4 in Reduced Shank

Product Description

The CHICAGO-LATROBE 53448 is a reduced shank cobalt drill bit designed for demanding portable drilling applications in metal and ferrous materials. It features a 3/4 inch cutting diameter paired with a 1/2 inch straight-cylindrical shank, allowing it to run in standard 1/2 inch chuck capacity drills without sacrificing cutting size. The 118-degree split point starts on contact and reduces walking, while the cobalt construction handles the heat generated when drilling cast iron, alloy steel, and carbon steel. Right-hand spiral flutes clear chips efficiently throughout the 3-1/8 inch flute length.

This Series 190C bit is built for general-purpose metal drilling in both shop and field environments. The reduced shank design makes it practical for portable drilling rigs and corded hand drills where chuck capacity is limited to 1/2 inch. Primary workpiece materials include cast iron and steel. Secondary applications cover alloy steel, carbon steel, and cast iron in fabrication, maintenance, and mechanical contracting work. Machinists, millwrights, ironworkers, and general maintenance trades reach for this bit when cutting diameter needs to exceed the available chuck size.

Key Features

• 3/4 inch cutting diameter with 1/2 inch reduced shank for use in standard 1/2 inch chucks
• Cobalt tool material provides heat resistance for drilling ferrous metals and hard alloys
• 118-degree split point reduces drill walking and lowers entry thrust
• Right-hand spiral flutes with regular helix promote consistent chip evacuation
• 6 inch overall length with 3-1/8 inch flute length for reach in deep-hole applications
• Diameter tolerance of +0.0000 to -0.0012 inches for controlled hole sizing

Compatibility

Designed for use in portable drilling applications with 1/2 inch chuck capacity drills. Rated for primary workpiece materials of cast iron and steel, with secondary compatibility for alloy steel and carbon steel. No coolant required per manufacturer specification.

Installation Notes

Installation is performed by machinists, ironworkers, or maintenance technicians using a 1/2 inch keyed or keyless chuck. Ensure the shank is fully seated and the chuck is properly tightened before operation. Secure the workpiece firmly to prevent rotation during drilling. Follow applicable shop safety standards and wear appropriate eye protection when drilling metal.