Hertel 18581 Countersink 3/16 in 82 Degree 4 Flute Hss

Product Description

The HERTEL 18581 is a 4-flute countersink designed for creating conical seat holes in metal and other materials prior to fastener installation. Built from high speed steel, it delivers consistent cutting performance on steel, aluminum, and similar workpiece materials. The 82-degree included angle matches the standard for flat-head fasteners used across general machining and fabrication work. Both the head diameter and straight-cylindrical shank measure 3/16 inch, making it compatible with standard drill chucks and collet holders of that bore size. This tool is suited for machine shops, maintenance technicians, and metalworking professionals who require precise, repeatable countersink geometry.

The HERTEL 18581 is used in drilling and deburring operations where a flush or recessed fastener seat is required. Typical applications include sheet metal fabrication, light structural work, and general machine shop operations. The 82-degree angle is the industry-standard geometry for flat-head machine screws and bolts, making this countersink a common choice for production and repair work on metal assemblies. The straight-cylindrical shank seats cleanly in drill press chucks, CNC spindles, and hand drill chucks sized to 3/16 inch.

Key Features

• 82-degree included angle matches flat-head fastener standards for flush seating
• 4-flute geometry provides smooth cutting action and reduces chatter
• High speed steel construction maintains edge integrity on steel and aluminum
• 3/16 inch straight-cylindrical shank fits standard chucks and collet systems
• 3/16 inch head diameter suited for small-diameter countersink applications

Compatibility

Designed as a standard replacement or stock countersink for use in drill presses, CNC machining centers, and hand drills accepting a 3/16 inch straight-cylindrical shank. Compatible with operations requiring an 82-degree flat-head fastener seat geometry.

Installation Notes

Installation and use should be performed by a qualified machinist or metalworking technician. Secure the workpiece firmly before operation and confirm the spindle or chuck is fully tightened on the shank before running. Use appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality. Follow applicable shop safety standards for rotating cutting tools, including use of eye protection and proper spindle speed selection for the material being cut.