Cleveland Golf C13176 1/16x12 In HSS Extension Drill

Extra-Long HSS Drill Bit

The Cleveland C13176 is a 1/16-inch high-speed steel extension drill designed for deep-hole drilling in aircraft maintenance and precision machining. Its 12-inch overall length reaches areas standard bits cannot, while the 135-degree split point reduces walking and ensures accurate starts in tough alloys. Machinists and technicians gain a specialised tool for high-performance fractional-inch work.

Heat Management in Deep Drilling

High-speed steel construction maintains hardness at the elevated temperatures generated during extended drilling cycles at 4xD depth. The bright, uncoated finish allows operators to apply cutting fluid directly for effective heat dissipation and chip evacuation. Consistent flute geometry supports stable cutting action, minimising vibration that can degrade hole quality or damage the workpiece.

Upgrade from Standard-Length Bits

This bit replaces shorter jobber drills when access exceeds their reach, such as drilling through wing spars, deep cavities or stacked components. The jump is justified when a 1/16-inch hole must be drilled to a 1/4-inch depth in confined spaces where standard lengths bottom out. It is not suited for production runs requiring coated-tool life or diameters outside the 1/16-inch fractional size.