Hertel C.E07.0170 Aircraft Extension Drill Bit Size 51

Product Description

The HERTEL C.E07.0170 is a cobalt aircraft extension drill bit designed for drilling in tight-clearance and hard-to-reach applications where a standard-length bit cannot reach. Built to wire gauge size 51 (0.0670 inches decimal), it features a 135-degree split point that is self-centering and eliminates the need for a center punch on most materials. The straw finish indicates controlled heat treatment of the cobalt steel substrate. At 12 inches overall length with a 1-inch spiral flute, this bit is the go-to choice for airframe technicians, aerospace MRO shops, and industrial maintenance professionals working through structural panels or deep cavities.

Aircraft extension drill bits like the C.E07.0170 are used in aerospace, sheet metal, and general industrial environments where access depth exceeds what a jobber-length bit allows. The right-hand spiral flute with tapered web configuration handles mild steel, aluminum, stainless, and other tough alloys common in aerospace and heavy manufacturing. Straight-cylindrical shank fits standard drill chucks without adapters. This bit is suited for general-purpose production drilling and MRO use where precision entry and hole quality matter in confined spaces.

Key Features

• Wire gauge size 51 (0.0670 inches decimal) for small-diameter precision drilling
• 135-degree split point with self-centering geometry eliminates pilot hole requirement
• Cobalt tool material resists heat buildup in hard and abrasive materials
• 12-inch overall length provides extended reach into deep or obstructed cavities
• Tapered web with web-thinned configuration reduces thrust and improves chip evacuation
• Meets NAS 907 standard for aircraft-quality drill bit performance

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill bit compatible with standard drill chucks accepting a straight-cylindrical shank of 0.0670 inches diameter.

Installation Notes

This bit is installed and operated by machinists, aerospace technicians, and industrial maintenance trades using standard drill presses, hand drills, or pneumatic drills. Secure the straight shank fully in the chuck before operation to prevent runout or walkout at extended length. Use cutting fluid appropriate to the workpiece material to prolong bit life and maintain hole quality. Inspect the split point and cutting edges before each use, as cobalt bits used at extended lengths are susceptible to flex-induced breakage if feed pressure is excessive.