Hertel C.E05.1191 Aircraft Extension Drill Bit 15/32 in Hss

Product Description

The HERTEL C.E05.1191 is a 15/32-inch diameter aircraft extension drill bit designed for reaching into deep or restricted areas where a standard-length bit cannot access. Built from high-speed steel with an oxide finish, it features a 135-degree split point for self-centering entry that reduces walking and eliminates the need for a center punch on most surfaces. The 12-inch overall length combined with a 4-5/16-inch spiral flute section provides the extended reach required in sheet metal, structural, and aircraft-style drilling applications. The two-flute, right-hand cutting spiral flute geometry promotes chip evacuation and consistent cutting performance on steel, aluminum, and similar materials.

This bit is suited for trade professionals and fabricators working in aerospace maintenance, HVAC equipment installation, structural metalwork, and any application requiring a long-reach drilling solution. The straight cylindrical shank fits standard drill chucks without modification. Its tapered web with web thinning reduces thrust requirements and extends bit life during repeated through-hole operations in metal.

Key Features

• 15/32-inch (0.4688 inch) diameter with matching straight cylindrical shank
• 135-degree split point for self-centering - no center punch required
• 12-inch overall length for extended-reach drilling in confined or deep work areas
• 4-5/16-inch (4.3125 inches) spiral flute length promotes efficient chip evacuation
• High-speed steel construction with oxide finish for heat and wear resistance
• Web-thinned tapered web reduces drilling thrust and extends service life
• Right-hand, two-flute cutting geometry for general-purpose metal drilling

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a 15/32-inch straight cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists, maintenance technicians, or trade professionals familiar with metal drilling procedures. Secure the workpiece firmly before drilling and ensure the drill chuck is fully tightened on the straight shank before operation. Use appropriate cutting fluid or coolant when drilling hardened or thick metal stock to maintain bit temperature and edge life. Inspect the cutting edges for wear or chipping before each use and replace the bit if the split point or flute geometry shows signs of damage.