Hertel 18778 Countersink 1/2 in 100 Degree 4 Flute Hss

Product Description

The HERTEL 18778 is a single-unit countersink designed for creating angled seat recesses in metal and other hard materials. Built from high-speed steel (HSS), it holds cutting hardness under the heat generated during drilling operations. The tool features a 1/2-inch head diameter, a 100-degree included angle, and a straight-cylindrical shank measuring 1/2 inch in diameter. With 4 flutes, it provides consistent chip evacuation and a clean finish in the countersunk recess. It is suited for machinists, maintenance technicians, and fabricators working in production or repair environments.

This countersink is intended for use in machining and metalworking applications where fastener head recesses must be accurately formed. The 100-degree included angle accommodates specific fastener geometries common in aerospace, industrial, and general fabrication work. The 1/2-inch straight-cylindrical shank fits standard drill chucks and milling machine collets, making it straightforward to deploy in both floor-standing and benchtop setups.

Key Features

• 1/2-inch head diameter for medium-range countersink applications
• 100-degree included angle matches specific flat-head fastener seat geometries
• 4-flute design promotes chip clearing and smooth recess finish
• High-speed steel construction maintains cutting edge under elevated operating temperatures
• 1/2-inch straight-cylindrical shank fits standard drill chucks and collets

Compatibility

Designed as an OEM-style replacement or direct-use countersink for metalworking setups requiring a 1/2-inch, 100-degree, 4-flute HSS tool with a straight-cylindrical shank.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill press, milling machine, or hand drill with an appropriate chuck size. Secure the shank fully in the chuck or collet before operation and verify spindle speed is appropriate for the workpiece material to avoid overheating the cutting edge. Always bring the spindle to a full stop before changing or adjusting the tool.