Hertel C.E05.0198 Aircraft Extension Drill Bit 5/64 in

Product Description

The HERTEL C.E05.0198 is an aircraft extension drill bit engineered for reaching into deep or obstructed bore locations that standard-length bits cannot access. Built from high-speed steel with an oxide finish, it measures 5/64 inch (0.0781 inch decimal) in diameter and extends to an overall length of 12 inches, giving technicians the reach needed in confined assemblies. The 135-degree split point self-centers on contact, reducing walking and eliminating the need for a center-punch in most applications. With a spiral flute design and web-thinned, tapered web configuration, the bit evacuates chips efficiently during cutting.

This bit is suited for general-purpose drilling in metalworking, maintenance, and fabrication environments where extended reach is required. Typical applications include aerospace-style assembly work, sheet metal fabrication, HVAC equipment manufacturing, and MRO drilling tasks where standard jobber-length bits fall short. The right-hand cutting direction and straight cylindrical shank allow it to seat in any standard drill chuck or right-angle drill adapter. The 1-inch flute length focuses cutting action at the tip while keeping the extended shank rigid enough for accurate hole placement.

Key Features

• 135-degree split point self-centers without center-punching
• 12-inch overall length provides extended reach into deep or restricted bore locations
• High-speed steel construction handles general-purpose metal drilling
• Oxide finish reduces friction and offers light corrosion resistance
• Web-thinned tapered web lowers thrust requirements and improves chip clearance
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard right-hand drill chucks and right-angle drill attachments accepting a straight cylindrical shank in 5/64 inch diameter.

Installation Notes

This bit is installed and operated by machinists, maintenance technicians, and sheet metal workers using standard electric or pneumatic drills. Secure the straight shank firmly in the chuck before operation and verify the work piece is clamped or fixtured to prevent movement. Extended-length bits are more susceptible to deflection at higher feed rates — use moderate feed pressure and appropriate cutting speed for the material being drilled. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed.