Value Collection B10357 Aircraft Extension Drill Bit 5/16 in

Product Description

The VALUE COLLECTION B10357 is a 5/16-inch aircraft extension drill bit designed for deep-reach drilling applications where standard-length bits cannot access the work area. Built from high-speed steel with an oxide finish, it features a 135-degree split point that self-centers on contact, reducing walk and the need for a center punch. The spiral flute design with a tapered web and web-thinned construction improves chip evacuation and reduces cutting resistance. At 6 inches overall length with a 3.1875-inch flute, this bit is suited for right-hand, general-purpose drilling in metal and other materials common in aerospace, HVAC, and sheet-metal fabrication work.

Aircraft extension drill bits like the B10357 are used when access is restricted by panels, framing, flanges, or structural components. Typical applications include drilling through sheet metal, light-gauge steel, and aluminum in aircraft maintenance, HVAC ductwork fabrication, and general metal fabrication. The straight cylindrical shank fits standard drill chucks. The extended reach is particularly useful for in-place repairs and installations where repositioning the workpiece is not practical. Tradespeople including HVAC sheet-metal mechanics, aircraft maintenance technicians, and industrial fabricators commonly use this type of bit.

Key Features

• 135-degree split point self-centers on contact, minimizing bit walk without a center punch
• Web-thinned, tapered web construction reduces thrust and improves cutting efficiency
• 6-inch overall length provides extended reach into confined or obstructed work areas
• High-speed steel construction handles repeated use on metal, aluminum, and similar materials
• Oxide finish provides basic surface protection and reduces friction during drilling
• Two-flute spiral design promotes consistent chip clearance during deep drilling

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a straight cylindrical 5/16-inch shank.

Installation Notes

Install in a standard keyed or keyless drill chuck rated for the shank diameter before use. Secure the workpiece firmly to prevent movement during drilling. Use appropriate cutting fluid or lubricant when drilling through steel to extend bit life and reduce heat buildup. Inspect the cutting edges before each use and replace the bit if chipping or dullness is observed, as a worn split-point bit can cause oversized holes and excessive heat.