Hertel C.E05.0861 Aircraft Extension Drill Bit Letter R

Product Description

The HERTEL C.E05.0861 is an aircraft extension drill bit designed for deep-reach drilling applications where a standard-length bit cannot access the work area. Built from high-speed steel with an oxide finish, this bit measures 12 inches in overall length and features a 135-degree split point with web thinning for self-centering entry and reduced thrust. The straight cylindrical shank diameter is 0.3390 inches, matching the Letter R decimal equivalent. Two spiral flutes with a tapered web configuration evacuate chips efficiently during extended-reach cuts. This bit meets NAS 907 standards and is suited for general-purpose metal drilling by machinists, aerospace maintenance technicians, and industrial trades.

This drill bit is built for applications requiring extended reach into airframes, structural assemblies, deep cavities, or tight access points where standard jobber-length bits fall short. The 3.4375-inch flute length provides adequate chip clearance even at depth. Its right-hand cutting direction and self-centering split point make it well suited for drilling aluminum, mild steel, and similar metals in MRO, aerospace, and general fabrication environments. Suitable for use in hand drills, drill presses, and right-angle drill attachments common in aircraft and structural maintenance work.

Key Features

• 135-degree split point with web thinning for self-centering starts and reduced drilling thrust
• 12-inch overall length provides extended reach for deep-cavity and airframe drilling
• High-speed steel construction with oxide finish for corrosion resistance and lubricity
• Letter R size with 0.3390-inch decimal diameter and matching straight cylindrical shank
• Two spiral flutes with tapered web configuration for efficient chip evacuation
• Meets NAS 907 standard for aircraft extension drill bits

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill bit compatible with standard straight-shank drill chucks accepting a 0.3390-inch shank diameter.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with drilling protocols for the applicable material and structure. Secure the shank firmly in a drill chuck rated for the bit diameter before operation, and verify the work piece is properly clamped or fixtured. When drilling metals, use appropriate cutting fluid to extend tool life and improve hole quality. Follow all applicable workplace safety standards and, for aerospace applications, adhere to relevant maintenance manual procedures and inspection requirements.