Hertel H-81186040600 Combo Drill Countersink Size 4 Cobalt

Product Description

The HERTEL H-81186040600 is a combination drill and countersink tool designed for simultaneous drilling and countersinking in a single operation. Built from cobalt high-speed steel, it delivers strong heat and wear resistance in demanding production and fabrication environments. The tool features a 5/16 inch body diameter, a 118-degree drill point angle, and a 60-degree included angle for countersinking. At 6 inches overall length, it is classified as a long-length tool. The bright polished finish reduces friction and aids in chip evacuation. Machinists and metalworking professionals use this tool in drill presses, CNC machining centers, and manual mills.

This combo drill countersink is suited for metalworking applications where a pilot hole and countersink must be produced in one pass. It is commonly used in sheet metal fabrication, structural steel work, and general machine shop operations. The plain cutting edge style and non-tapered, non-insertable design make it a straightforward, solid-body tool. It is appropriate for use on ferrous and non-ferrous metals where cobalt tooling provides an advantage over standard high-speed steel.

Key Features

• Cobalt construction for improved heat resistance and tool life in hard materials
• 118-degree drill point angle for general-purpose metal drilling
• 60-degree included angle for standard countersink geometry
• 5/16 inch body and point diameter for consistent sizing through the cut
• 1/8 inch drill point length with 6 inch overall length for extended reach
• Bright polished finish to reduce friction and improve chip flow

Compatibility

Designed as a size 4 combo drill countersink for use in standard drill chucks and collets accepting a 5/16 inch shank, suitable for metalworking and fabrication applications requiring combined drilling and countersinking.

Installation Notes

Installation and use of this tool should be performed by qualified machinists or metalworking professionals familiar with speeds and feeds for cobalt tooling. Secure the workpiece firmly before operation and confirm the spindle and chuck are properly tightened. Use appropriate cutting fluid to extend tool life when working with ferrous metals. Inspect the cutting edges before each use and replace the tool if chipping or excessive wear is observed.