Hertel H-81186070600 Combo Drill Countersink Size 7 Cobalt

Product Description

The HERTEL H-81186070600 is a combination drill and countersink tool machined from cobalt steel and finished with a bright polished surface. It carries a trade size of 7 and a body diameter of 5/8 inches, making it suited for applications that require a clean pilot hole and a properly seated countersink in a single pass. The drill point measures 1/4 inch in diameter with a 1/4 inch point length, and the tool runs a 118-degree drill point angle paired with a 60-degree included angle on the countersink. Overall length is 6 inches. This is a long-length tool with a plain cutting edge and a double end type, intended for professional machining and fabrication environments.

This combo drill countersink is used in metal fabrication, maintenance machining, and general manufacturing where countersinking is required for flat-head fastener seating. The cobalt construction makes it appropriate for harder materials such as stainless steel, hardened alloys, and heat-resistant metals where high-speed steel tooling would wear prematurely. It is not configured in an aircraft style and does not accept an insertable cutter head. The tool is not tapered. Typical users include machinists, toolroom technicians, and skilled tradespeople performing precision metalwork.

Key Features

• Cobalt steel construction handles harder workpiece materials with extended tool life compared to standard HSS
• Bright polished finish reduces friction and aids chip evacuation during cutting
• 118-degree drill point angle provides aggressive cutting geometry suited for most metals
• 60-degree included countersink angle seats standard flat-head fasteners accurately
• Double end design allows use of both ends, extending the service life of each tool
• Long-length body at 6 inches overall provides reach in deeper setups

Compatibility

Designed as an OEM-style replacement or direct substitute for trade size 7 combo drill countersink tooling used in standard machining and metalworking operations requiring a 5/8 inch body diameter and 60-degree countersink geometry.

Installation Notes

This tool is installed in a compatible drill chuck or collet holder rated for the 5/8 inch body diameter. Verify spindle speed and feed rate are appropriate for the workpiece material before cutting. Secure the workpiece firmly before operation to prevent movement during the combined drilling and countersinking pass. Inspect the cutting edges before each use and replace the tool if chipping or wear is observed.