Hertel C.E03.0833 Aircraft Extension Drill Bit 21/64 in

Product Description

The HERTEL C.E03.0833 is an aircraft extension drill bit designed for drilling in tight or deep-clearance applications where a standard-length bit cannot reach. Built from high-speed steel with an oxide finish, this bit measures 21/64 inch (0.3281 inch) in diameter and runs to a 6-inch overall length, giving technicians the extended reach needed on structural and mechanical assemblies. The 135-degree split point is self-centering, which reduces walking on entry and eliminates the need for a center punch on most surfaces. Two spiral flutes channel chips out of the hole efficiently, and the tapered web construction supports edge strength without sacrificing cutting action.

This drill bit is suited for general-purpose metal drilling in aerospace, HVAC, plumbing, and industrial maintenance applications. The extended length makes it particularly useful when accessing fastener locations inside equipment enclosures, ductwork flanges, or structural panels where standard jobber-length bits fall short. The straight cylindrical shank seats directly into standard drill chucks or right-angle drill attachments without adapters. Right-hand cutting direction is standard for conventional drill presses and portable electric drills.

Key Features

• 135-degree split point is self-centering for precise hole starts without center punching
• Web-thinned, tapered web design reduces thrust load and improves chip evacuation
• 6-inch overall length provides extended reach in confined or deep-clearance work areas
• High-speed steel construction with oxide finish resists heat buildup during extended drilling cycles
• Two spiral flutes with 3-5/16 inch (3.3125 inch) flute length clear chips consistently
• Straight cylindrical shank fits standard drill chucks with no adapter required

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard drill chucks and right-angle drill attachments accepting a 21/64 inch straight cylindrical shank.

Installation Notes

This bit is installed and used by machinists, sheet metal workers, HVAC technicians, and maintenance professionals working with portable or bench-mounted drills. Secure the workpiece before drilling and ensure the chuck is fully tightened on the shank to prevent slippage during operation. Use appropriate cutting fluid on harder metals to extend bit life and reduce heat. Wear eye protection and follow applicable shop safety standards when operating any rotary cutting tool.