Chicago-latrobe 50505 Extra Length Drill Bit 5/16 in Hss

Product Description

The CHICAGO-LATROBE 50505 is an extra length high speed steel drill bit designed for long reach drilling applications where standard-length bits fall short. It measures 5/16 inch (0.3125 inches) in diameter with a 10-inch overall length and a 7.5-inch flute length, giving technicians and machinists the reach needed to access deep or obstructed bore locations. The bit features a 118-degree notched point with web thinning for easier entry and reduced thrust force. An oxide finish provides baseline lubricity and corrosion resistance during use. This is a general purpose bit suited to production and service environments alike.

The 50505 is intended for drilling cast iron and steel in applications requiring extended reach beyond the capability of jobber-length tooling. Typical install scenarios include drilling through structural members, deep housings, or assemblies where the drill must extend past a surrounding component before reaching the work surface. The straight-cylindrical shank accommodates standard drill chucks in handheld, drill press, and mill setups. It is sold as a single bit and is appropriate for use by machinists, maintenance technicians, pipefitters, HVAC installers, and electricians working in tight or deep-clearance situations.

Key Features

• 10-inch overall length and 7.5-inch flute length for deep-reach drilling
• 118-degree notched point with web thinning reduces entry thrust and improves centering
• High speed steel construction with oxide finish for general purpose durability
• Tapered web with regular spiral flute for efficient chip evacuation
• Right-hand cutting direction, 2-flute design
• Diameter tolerance held to +0.0000 to -0.0010 inches for consistent fit

Compatibility

Designed for drilling cast iron and steel workpieces in long-reach applications. The 5/16-inch straight-cylindrical shank fits any standard 3/8-inch or larger keyed or keyless drill chuck.

Installation Notes

A licensed machinist or qualified tradesperson should select appropriate spindle speed based on material hardness and bit diameter before use. Secure the workpiece fully before drilling to prevent movement and bit breakage. Do not force the bit through the material; maintain consistent feed pressure and clear chips frequently on deep holes. California Proposition 65 warnings apply to this product.