Hertel 86848009 No. 30 Cobalt Drill Bit 135 Split Point

Product Description

The HERTEL 86848009 is a cobalt threaded-shank drill bit engineered for drilling into high-tensile-strength materials where standard HSS bits fail or wear prematurely. Built to No. 30 wire gauge size (0.1285 inches decimal), it features a 135-degree split point that starts on contact without walking, reducing the need for a center punch. The 1/4-28 threaded shank locks into compatible threaded-shank holders used on close-tolerance drilling fixtures and rivet guns. At 2.125 inches overall length with a 1.125-inch spiral flute, this bit is sized for shallow-to-medium depth applications. The oxide finish provides baseline lubricity and corrosion resistance. Meets NAS 965 specification. Right-hand cutting, regular spiral, tapered web configuration.

This bit is suited for production drilling and MRO applications in aerospace, sheet metal fabrication, and structural steel work where high-tensile alloys, stainless steel, or hardened materials are common. The 1/4-28 threaded shank design is standard in air-powered and pneumatic drilling systems used by aircraft mechanics, sheet metal workers, and industrial maintenance technicians. The split point geometry and cobalt substrate make it a practical choice when drilling through tough substrates where frequent bit replacement drives up cost. General-purpose grade, appropriate for both production runs and field repair work.

Key Features

• Cobalt construction for drilling high-tensile-strength and hardened materials
• 135-degree split point starts on contact and reduces walking without a center punch
• 1/4-28 threaded shank fits standard threaded-shank drilling fixtures and holders
• Oxide coating provides lubricity and basic corrosion resistance
• Meets NAS 965 specification for dimensional and performance standards
• Web-thinned, tapered web configuration reduces thrust and improves chip clearance

Compatibility

Designed for use in drilling systems and fixtures that accept a 1/4-28 threaded shank. Intended for use in high-tensile-strength materials per NAS 965 specification. No additional model-specific compatibility data was provided for this part.

Installation Notes

Installation and use should be performed by qualified machinists, aircraft mechanics, or industrial maintenance technicians familiar with threaded-shank drilling equipment. Secure the bit fully into the threaded holder before operation and verify the shank is engaged to full thread depth to prevent slippage under load. Always wear appropriate eye protection and secure the workpiece before drilling. Do not use this bit in a standard drill chuck not designed for threaded-shank tooling, as the interface will not provide adequate retention.