Chicago-latrobe 50734 Extra Length Drill Bit 0.25 in Hss

Product Description

The CHICAGO-LATROBE 50734 is an extra length high speed steel drill bit engineered for long-reach drilling applications where standard-length bits cannot access the workzone. Part of the Series 120X lineup, this bit measures 0.25 inches in diameter with a 10-inch overall length and a 7.5-inch spiral flute. The 118-degree notched point angle and web-thinned construction reduce entry force and improve chip evacuation, making it well suited for production and maintenance drilling in ferrous materials. A black oxide finish provides light corrosion resistance and reduces friction during operation.

This bit is designed for drilling cast iron and steel in applications that require extended reach into deep cavities, stacked assemblies, or confined structural members. Typical install scenarios include mechanical contractors, pipefitters, ironworkers, and maintenance technicians working on structural steel, equipment frames, or cast iron components where standard-length tooling falls short. Right-hand cutting direction suits conventional drill press and handheld drilling equipment.

Key Features

• 0.25-inch (Letter E) diameter with 10-inch overall length for long-reach access
• High speed steel construction for durability in cast iron and steel drilling
• 118-degree notched point with web thinning for reduced thrust and cleaner entry
• Tapered web and 2-flute spiral design promote efficient chip removal
• Black oxide finish reduces friction and provides light corrosion protection
• Straight-cylindrical shank fits standard 3-jaw drill chucks without adapters

Compatibility

Designed for use in standard 3-jaw drill chucks accepting a 0.25-inch straight-cylindrical shank. Primary workpiece materials are cast iron and steel. Suitable for drill press, handheld power drill, and magnetic drill press setups where chuck capacity accommodates a 0.25-inch shank.

Installation Notes

Installation is performed by machinists, maintenance technicians, and trade professionals operating drill presses or handheld drilling equipment. Secure the shank fully in the chuck and verify concentricity before drilling. Use appropriate cutting fluid when drilling steel or cast iron to extend tool life and maintain dimensional accuracy. Follow all applicable machine guarding and PPE requirements per OSHA and shop safety standards.