Chicago-latrobe 50814 Cobalt Screw Machine Drill Bit 17/64

Product Description

The CHICAGO-LATROBE 50814 is a screw machine length cobalt drill bit designed for heavy-duty drilling in cast iron and steel. Built to Series 559 standards, it measures 17/64 inch (0.2656 inches) in diameter with an overall length of 2-5/8 inches and a flute length of 1-7/16 inches. The 135-degree split point reduces walking and lowers thrust required at entry. Web thinning improves chip clearance in tough ferrous materials. The M42 cobalt steel construction handles elevated cutting temperatures without losing hardness, making it suited for production environments where bits run hot.

This bit is built for screw machine and short-hole drilling applications in metal fabrication, maintenance, and production machining. The straight-cylindrical shank seats in standard drill chucks, CNC turrets, and screw machine spindles without adapter collars. Primary workpiece materials are cast iron and steel. The regular spiral with parallel web configuration gives consistent chip evacuation in through-holes and blind holes alike. This is a single-bit package intended for industrial and trade use by machinists, pipefitters, and maintenance technicians who need a reliable stubby bit for tight-clearance or high-cycle work.

Key Features

• M42 cobalt steel construction resists heat buildup during extended cuts in ferrous metals
• 135-degree split point reduces thrust and minimizes drill walking on entry
• Web-thinned, parallel web design improves chip flow and reduces torque demand
• Screw machine length body (2-5/8 inches overall) fits tight spaces and short-travel spindles
• Right-hand cut, 2-flute spiral configuration for standard forward-feed drilling
• Diameter tolerance of +0.0000 to -0.0010 inches for controlled-fit hole sizing
• ISO standards compliance for dimensional consistency

Compatibility

Designed as an OEM-style replacement and direct-use drill bit for standard drill chucks, CNC turrets, and screw machine spindles accepting straight-cylindrical shank tooling in the 17/64 inch diameter class.

Installation Notes

A licensed machinist or qualified maintenance technician should secure the shank fully in a properly sized collet or chuck before operation. Ensure the machine spindle is fully stopped and locked out before changing or inspecting the bit. Use appropriate cutting fluid or coolant when drilling steel at production feed rates to extend tool life, noting that this bit does not support internal coolant-through delivery. Follow shop safety codes and applicable OSHA machine-guarding requirements when operating drill presses, lathes, or CNC equipment.