Precision Twist Drill 5996088 Cobalt Aircraft Extension Drill

Product Description

The PRECISION TWIST DRILL 5996088 is a cobalt aircraft extension drill bit designed for drilling in hard metals, stainless steel, and high-temperature alloys where standard high-speed steel tooling falls short. This Series CO501-6 bit measures 0.096 inches in diameter (Wire Size No. 41) with a 1.375-inch flute length and a 6-inch overall length, giving technicians extended reach in tight or deep-access applications. The 135-degree split point is self-centering, eliminating the need for a center punch on most materials and reducing walking on entry. A straw finish indicates the cobalt content and heat treatment applied during manufacturing.

This drill bit is suited for aerospace, automotive, and industrial maintenance applications where extended reach is required. The extended shank allows drilling into recessed areas or through deep structural members that standard-length bits cannot reach. It is typically installed in handheld or machine-mounted drill motors by machinists, aircraft mechanics, and maintenance technicians working on ferrous and non-ferrous metals. The 6-inch overall length makes it particularly useful in aircraft fabrication and repair work where access is restricted.

Key Features

• Cobalt tool material for superior heat and wear resistance in hard metals
• 135-degree split point with self-centering geometry reduces walking and eliminates center-punch step
• 6-inch overall length provides extended reach for deep or restricted-access drilling
• Straight-cylindrical shank fits standard drill chucks without adapters
• Two-flute spiral design with web-thinned tapered web for efficient chip evacuation
• Right-hand cutting direction; NAS 907 Type J standard compliance

Compatibility

Designed as an OEM-style replacement or general-purpose cobalt extension drill bit for use in standard straight-shank drill chucks compatible with 0.096-inch shank diameter tooling.

Installation Notes

This bit is installed by machinists, aircraft mechanics, or industrial maintenance technicians using handheld or bench-mounted drill motors. Ensure the drill chuck is fully tightened on the straight-cylindrical shank before operation to prevent slippage. When drilling hard alloys, use appropriate cutting fluid to manage heat buildup and extend tool life. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.