Chicago-latrobe 50516 Extra Length Drill Bit 0.3438 in Hss

Product Description

The CHICAGO-LATROBE 50516 is an extra length high speed steel drill bit designed for long reach drilling applications where standard-length bits cannot access deep or recessed bore locations. Built from high speed steel with an oxide finish, this bit measures 0.3438 inches in diameter with a 10-inch overall length and a 7.5-inch flute length. The 118-degree notched point and web-thinned, tapered web construction reduce entry force and improve chip evacuation. Two right-hand spiral flutes clear material efficiently during cutting. Machinists, millwrights, pipefitters, and maintenance technicians working with cast iron and steel stock are the primary users of this bit.

The 50516 is suited for production and maintenance drilling in cast iron and steel where extended reach is required. Typical applications include deep-hole drilling in structural steel, pipe flanges, machinery frames, and fabricated assemblies. The straight-cylindrical shank seats directly in standard drill chucks without adapters, making it compatible with portable drills, drill presses, and magnetic base drill units commonly used in field and shop settings.

Key Features

• Extra length 10-inch OAL provides reach beyond standard jobber-length bits
• High speed steel construction handles cast iron and steel at normal drilling speeds
• Oxide finish improves lubricity and provides basic corrosion resistance
• 118-degree notched point with web thinning reduces thrust and improves centering
• Tapered web with regular spiral flutes promotes consistent chip removal
• Diameter tolerance of +0.0000 to -0.0010 inches ensures accurate bore sizing

Compatibility

Designed for use in cast iron and steel workpieces. The straight-cylindrical shank diameter of 0.3438 inches fits standard drill chucks rated for that capacity. Part of the CHICAGO-LATROBE Series 120X extra length drill program for general purpose long reach work.

Installation Notes

Secure the shank fully in a properly sized drill chuck before operation. Use appropriate cutting fluid or lubricant when drilling steel to extend tool life and maintain bore quality. Verify workpiece is clamped securely before drilling to prevent bit walking or workpiece rotation. California Proposition 65 warnings apply to this product.