Hertel C.E13.1111 Extra Length Cobalt Drill Bit 7/16

Product Description

The HERTEL C.E13.1111 is a 7/16 inch (0.4375 inches) extra length cobalt drill bit designed for demanding drilling applications where standard-length bits fall short. Built from cobalt high-speed steel with a bright/uncoated finish, it delivers heat resistance and edge retention when cutting through hard or abrasive materials. The 135-degree split-point tip reduces walking at startup and lowers required thrust force, making it a reliable choice for production shops, maintenance crews, and tool-and-die work. The overall length of 8.0 inches and a 5.5-inch flute length provide reach into deep-hole applications that standard drill bits cannot access.

This bit is suited for general-purpose drilling in ferrous metals, stainless steel, cast iron, and hard alloys where cobalt tooling is the preferred grade. The extra length format is commonly used in structural fabrication, heavy equipment maintenance, and industrial production environments where deep bores or offset clearance are required. A two-flute design promotes efficient chip evacuation throughout the full flute length, reducing the risk of bit binding in deep holes.

Key Features

• 7/16 inch diameter (0.4375 inches) cobalt construction for heat resistance in hard materials
• 135-degree split-point tip reduces drill walking and required feed pressure
• 8.0-inch overall length with 5.5-inch flute length for deep-hole reach
• Bright/uncoated finish — no coating buildup to affect tolerances
• Two-flute design promotes chip clearance in deep drilling operations
• General-purpose grade suitable for ferrous metals, stainless, and hard alloys

Compatibility

Designed as a general-purpose extra length drill bit compatible with standard drill chucks and CNC spindles accepting 7/16 inch shank tooling.

Installation Notes

This bit is intended for installation by machinists, tool-and-die workers, or maintenance technicians using compatible drill presses, CNC machines, or heavy-duty hand drills. Ensure the chuck or collet is fully tightened and the workpiece is securely fixtured before operation. Cobalt bits should be run with appropriate cutting fluid or coolant when drilling hard materials to extend tool life. Inspect the split point for chipping before use and replace the bit if edge integrity is compromised.