Chicago-latrobe 50634 Extra Length Drill Bit 0.6719 in Hss

Product Description

The CHICAGO-LATROBE 50634 is a Series 120X extra length high speed steel drill bit designed for long-reach drilling applications where standard-length bits cannot access the work zone. The bit measures 0.6719 inches in diameter with a 12-inch overall length and a 9-inch flute length, providing extended reach without sacrificing rigidity. The oxide finish improves lubricity and surface hardness. A 118-degree notched point with web thinning reduces thrust at entry and improves chip evacuation. Two spiral flutes in a regular helix carry chips efficiently out of deep holes. This bit is sized for use by machinists, maintenance technicians, and fabricators working on deep-hole drilling tasks in production or field settings.

The 50634 is intended for long-reach drilling into cast iron and steel workpieces where standard jobber-length or mechanics-length bits lack the reach. The straight-cylindrical shank measures 0.6719 inches in diameter and 3 inches in length, seating securely in standard drill chucks or collet holders on drill presses, magnetic drills, and CNC machining centers. The tapered web configuration maintains core strength across the extended flute length. Right-hand cutting direction is standard for conventional clockwise spindle rotation.

Key Features

• 0.6719-inch diameter with tolerance of +0.0000 to -0.0012 inches for close-tolerance hole sizing
• 12-inch overall length with 9-inch flute length for deep-reach drilling
• High speed steel construction rated for cast iron and steel workpieces
• 118-degree notched point with web thinning reduces entry thrust and improves centering
• Oxide finish enhances surface lubricity and corrosion resistance
• Tapered web with regular spiral flutes promotes efficient chip removal in deep holes

Compatibility

Designed for long-reach drilling applications in cast iron and steel. Fits standard drill chucks and collet holders accepting a 0.6719-inch straight-cylindrical shank.

Installation Notes

Secure the shank fully in the chuck or collet before operation and verify runout before drilling. Use appropriate cutting fluid for steel or cast iron to extend tool life and manage heat at extended depths. Reduce feed pressure as flute length engagement increases to prevent deflection or bit breakage. Always wear appropriate eye protection and ensure the workpiece is properly clamped before starting the spindle.