Chicago-latrobe 53658 Cobalt Reduced Shank Drill Bit 29/32 in

Product Description

The CHICAGO-LATROBE 53658 is a reduced shank cobalt drill bit designed for general-purpose portable drilling in ferrous metals and hard materials. Built from cobalt tool steel, it holds up under the heat generated by drilling cast iron, alloy steel, and carbon steel. The bit measures 29/32 inches (0.9062 inches decimal) in cutting diameter with a 1/2-inch straight-cylindrical reduced shank, making it compatible with standard 1/2-inch drill chucks. Overall length is 6 inches with a 3-1/8-inch flute length. The 118-degree split point reduces walking on entry and lowers the thrust needed to start the cut. This bit is sold individually and is suited for use by machinists, ironworkers, and maintenance mechanics.

The 53658 is intended for portable drilling applications in shop and field environments. It is well matched to drilling cast iron, carbon steel, and alloy steel workpieces. The reduced shank design allows a larger-diameter bit to be driven by a standard 1/2-inch drill or drill press chuck without requiring a larger machine spindle. The Series 190C-TN designation identifies this as part of Chicago-Latrobe's coated cobalt line, intended for production and maintenance drilling where heat resistance and edge retention matter. The 2-1/4-inch shank length provides solid chuck engagement to minimize runout during use.

Key Features

• Cobalt tool steel construction for improved heat resistance over standard high-speed steel bits
• 118-degree split point reduces drill walk and lowers entry thrust
• Reduced shank (1/2 inch) allows use in standard 1/2-inch drill chucks despite 29/32-inch cutting diameter
• Right-hand cut with 2-flute regular spiral geometry for efficient chip evacuation
• Coated finish on Series 190C-TN for added surface protection and lubricity
• Diameter tolerance of +0.0000 to -0.0012 inches for consistent hole sizing

Compatibility

Designed for use in standard 1/2-inch capacity portable drills and drill presses. Primary workpiece materials are cast iron and steel; secondary materials include alloy steel, carbon steel, and cast iron. Not rated for coolant-through applications.

Installation Notes

Installation is performed by machinists, maintenance mechanics, or ironworkers using a 1/2-inch drill or drill press. Secure the shank fully within the chuck jaws and tighten to prevent slippage during high-torque cuts. Use appropriate cutting fluid or lubricant when drilling steel to extend bit life, even though the bit carries a coated finish. Inspect the split point for damage before each use; a chipped or worn point will increase thrust and reduce hole quality.