Cleveland C08119 Aircraft Extension Drill Bit 3/16 in Cobalt

Product Description

The CLEVELAND C08119 is a cobalt aircraft extension drill bit engineered for deep-reach drilling in aerospace, structural, and industrial applications. Built to a 3/16 inch (0.1875 inch) diameter with a 6 inch overall length, this bit handles reach requirements that standard-length bits cannot address. The 135-degree split point is self-centering, reducing walk-on-entry without a center punch. A straw finish indicates cobalt heat treatment, giving the bit added hardness and heat resistance for drilling through high-strength alloys, hardened steels, and stainless. Licensed machinists, aircraft maintenance technicians, and fabricators typically reach for this tool when access depth is the constraint.

The C08119 is suited for through-hole and clearance drilling in tight bays, fuselage structures, and deep-set assemblies where standard jobber bits fall short. The 2-5/16 inch spiral flute length provides efficient chip evacuation, keeping the cut clean during extended drilling cycles. The straight cylindrical shank seats directly into standard drill chucks and collet holders without adapters. General-purpose performance rating makes it appropriate across a wide range of base metals and composite materials common in aviation and industrial maintenance environments.

Key Features

• Cobalt construction with straw finish for heat resistance and durability in hard metals
• 135-degree split point with web thinning for self-centering entry and reduced thrust force
• 6 inch overall length for deep-reach applications inaccessible to standard jobber bits
• Spiral flute design with tapered web configuration for efficient chip removal
• Right-hand cutting direction with 2-flute geometry
• Meets NAS 907 Type J standard for aircraft-grade tooling

Compatibility

Designed for use in standard drill chucks and collet holders accepting a 3/16 inch straight cylindrical shank. Suitable for general-purpose drilling in ferrous metals, stainless steel, and high-strength alloys typical of aerospace and industrial maintenance work.

Installation Notes

Secure the straight cylindrical shank fully into the drill chuck or collet before operation to prevent runout. Always use cutting fluid or coolant when drilling hardened steels or stainless to preserve edge life. Ensure the workpiece is clamped securely before drilling to prevent grab or deflection at the extended length. Follow applicable shop safety standards and wear appropriate eye protection during all drilling operations.