Chicago-latrobe 53650 Reduced Shank Drill Bit 25/32 in Cobalt

Product Description

The CHICAGO-LATROBE 53650 is a cobalt reduced shank drill bit designed for demanding portable drilling applications in metal fabrication, maintenance, and mechanical trade work. It carries a 25/32 inch (0.7812 inch decimal) cutting diameter on a 1/2 inch straight-cylindrical reduced shank, allowing it to run in standard 1/2 inch chuck equipment while cutting oversized holes. The 118-degree split point promotes fast engagement and reduces walking on startup without a center punch. Cobalt construction provides elevated heat resistance compared to standard high-speed steel, making it well-suited for harder ferrous materials. This bit is part of the Series 190C-TN line and features a coated finish for additional wear resistance.

This bit is intended for right-hand cutting in cast iron, steel, alloy steel, and carbon steel workpieces. Typical applications include structural fabrication, equipment repair, and production drilling where hole diameters exceed the capacity of a standard jobber-length bit but a full-shank profile is not required. The reduced shank design makes it compatible with common 1/2 inch drill chucks found on portable and bench-mounted drilling equipment, eliminating the need for a larger-capacity machine to drill 25/32 inch holes.

Key Features

• Cobalt tool material for heat resistance in hard ferrous materials
• 118-degree split point for fast startup engagement with reduced walking
• Reduced shank diameter of 1/2 inch allows use in standard 1/2 inch chucks
• Right-hand spiral flute geometry with regular helix for efficient chip evacuation
• Coated finish extends cutting edge life during general-purpose drilling
• Diameter tolerance of +0.0000 to -0.0012 inches for consistent hole sizing

Compatibility

Designed for use in portable and bench-mounted drilling equipment with 1/2 inch drill chucks. Rated for primary workpiece materials including cast iron and steel, and secondary materials including alloy steel, carbon steel, and cast iron. No coolant is required for general-purpose use.

Installation Notes

Installation is performed by machinists, millwrights, and mechanical trades professionals using standard 1/2 inch keyed or keyless drill chucks. Secure the shank fully in the chuck before operation and verify chuck key removal prior to starting the drill. Reduce feed pressure when breaking through the back side of the workpiece to prevent grab and bit deflection. Cobalt bits can tolerate dry drilling in most steel applications, but a cutting fluid will extend service life when drilling harder alloys.