Chicago-latrobe 50644 Extra Length Drill Bit 0.7031 in Hss

Product Description

The CHICAGO-LATROBE 50644 is a straight-shank extra length twist drill bit engineered for long-reach drilling applications in cast iron and steel. Built from high speed steel with an oxide finish, this bit measures 0.7031 inches in diameter with a 12-inch overall length and a 9-inch spiral flute. The 118-degree notched point with web thinning reduces entry force and improves chip evacuation on tough ferrous workpieces. The tapered web configuration adds column strength over the extended reach. This bit is sized for production and maintenance drilling where standard-length bits cannot reach the cut zone.

The 50644 is suited for deep-hole and long-reach drilling in fabrication shops, machine shops, and industrial maintenance environments. It performs in cast iron and steel applications where extended flute length is required to clear chips without withdrawing the bit repeatedly. The straight-cylindrical shank seats in standard drill chucks and CNC tool holders. Right-hand cutting direction is standard for conventional drill press, lathe, and hand-held power tool use.

Key Features

• 0.7031-inch diameter with tight tolerance of +0.0000 to -0.0012 inches for accurate hole sizing
• 12-inch overall length with 9-inch spiral flute for long-reach drilling without tool changeover
• 118-degree notched point with web thinning reduces thrust and improves centering on hard materials
• High speed steel construction with oxide finish for heat resistance and corrosion protection
• Tapered web and 2-flute spiral design promote efficient chip clearance in deep holes
• Series 120X general purpose grade rated for cast iron and steel workpieces

Compatibility

Designed for use in standard drill chucks and CNC holders accepting a straight-cylindrical shank; primary workpiece materials are cast iron and steel as specified by the manufacturer for Series 120X general purpose extra length drill bits.

Installation Notes

Secure the shank fully in the drill chuck or tool holder before use and verify runout before beginning the cut. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting this bit does not support coolant-through delivery. Reduce feed rate when breaking through the far side of the workpiece to prevent bit deflection or workpiece damage. Follow applicable shop safety practices and OSHA standards for rotating cutting tools.