Chicago-latrobe 53656 Reduced Shank Drill Bit 7/8 Inch

Product Description

The CHICAGO-LATROBE 53656 is a cobalt reduced shank drill bit designed for general-purpose portable drilling in ferrous metals. It carries a 7/8 inch (0.8750 inch) cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to run in standard 1/2 inch drill chucks without requiring a larger spindle. The 118-degree split point starts on contact without walking, reducing setup time on cast iron and steel. A spiral flute geometry and coated finish support heat resistance and chip evacuation during continuous drilling operations. This bit is part of the Series 190C-TN line and is suited for use by machinists, pipefitters, ironworkers, and maintenance technicians who need a reliable reduced shank geometry in the field or on the floor.

The 53656 is built for portable drilling applications on primary workpiece materials including cast iron and steel, with secondary compatibility covering alloy steel and carbon steel. The reduced shank design makes it practical when the drill chuck capacity is limited to 1/2 inch but a larger bore diameter is required. With a 6 inch overall length and 3-1/8 inch flute length, it handles moderate-depth holes without excessive deflection. Right-hand cut direction is standard for use with conventional forward-rotating drills and drill presses.

Key Features

• Cobalt tool material for improved heat and wear resistance in ferrous metal drilling
• 118-degree split point reduces thrust and eliminates center punch requirement on most metals
• Reduced shank (1/2 inch) fits standard 1/2 inch chucks while cutting a 7/8 inch diameter bore
• Coated finish extends tool life in cast iron, alloy steel, and carbon steel applications
• 2-flute spiral design with regular helix promotes efficient chip clearance
• Diameter tolerance of +0.0000 to -0.0012 inches ensures consistent, close-tolerance holes

Compatibility

Designed for general-purpose portable drilling in cast iron, steel, alloy steel, and carbon steel. The 1/2 inch straight-cylindrical shank is compatible with any 1/2 inch or larger drill chuck. No coolant system is required for standard applications.

Installation Notes

This bit is installed and used by machinists, pipefitters, and maintenance trades working with hand-held drills or drill presses. Always power down and de-energize the drill or press before securing the bit in the chuck. Confirm chuck jaw engagement is fully seated on the 1/2 inch shank before operation. Do not use this bit in SDS or spline-drive chucks without an appropriate adapter, as the straight shank requires a keyed or keyless chuck interface.