Precision Twist Drill 5996072 Cobalt Drill Bit Wire 37

Product Description

The PRECISION TWIST DRILL 5996072 is a cobalt aircraft extension drill bit designed for demanding drilling applications in hard and abrasive materials. Built to Series CO501-6 specifications, it carries a wire gauge size of 37, equivalent to 0.104 inches in diameter. The 135-degree split point is self-centering and web-thinned, reducing walking on entry and lowering thrust requirements at the start of the cut. The straw finish indicates the cobalt steel was heat-treated for added surface hardness. At 6 inches overall length with a 1.4375-inch spiral flute, this bit gives extended reach into confined spaces. Licensed HVAC, maintenance, and fabrication tradespeople use extension drill bits like this when standard-length bits cannot access the work zone.

This bit is suited for production and maintenance drilling in metals including stainless steel, titanium, high-nickel alloys, and hardened steels where standard high-speed steel bits wear prematurely. The aircraft-extension geometry provides the extra reach needed in aerospace, HVAC ductwork, structural steel, and general metalworking applications. The right-hand cutting spiral and cylindrical straight shank allow use in standard drill chucks without adapters. Compliance with NAS 907 Type J confirms the geometry and tolerances meet aerospace-grade standards for extension drills.

Key Features

• Wire size 37 (0.104 inches) cobalt steel construction for heat and wear resistance in hard metals
• 135-degree split point with web thinning for self-centering entry and reduced feed pressure
• 6-inch overall length with 1.4375-inch flute for extended reach into confined or deep work areas
• Straw finish indicating heat-treated cobalt for added surface hardness
• Right-hand spiral flute with tapered web configuration for efficient chip evacuation
• Meets NAS 907 Type J aerospace extension drill standard

Compatibility

Designed as an OEM-style replacement and general-purpose extension drill bit for use in any standard drill chuck or drill press accepting a 0.104-inch straight cylindrical shank, consistent with Series CO501-6 aircraft extension drill applications.

Installation Notes

Extension drill bits are typically installed and operated by machinists, maintenance technicians, and HVAC or structural tradespeople using a standard keyed or keyless chuck. Ensure the work piece is securely clamped before drilling to prevent bit walking or breakage on entry. Use appropriate cutting fluid for ferrous and hard alloy metals to extend bit life and manage heat buildup. Inspect the split point for chipping before each use, as cobalt bits can fracture under lateral stress if the point is damaged.