Hertel 18539 Countersink 3/4 in 90 Degree 6 Flute Hss

Product Description

The HERTEL 18539 is a 6-flute countersink designed for creating clean, chamfered seat profiles in metal and similar materials. Built from high speed steel, it delivers consistent cutting performance across repeated use in production or maintenance environments. The tool features a 3/4 inch head diameter and a 90-degree included angle, making it suited for standard flat-head fastener seating. The straight-cylindrical 1/2 inch shank mounts directly in a drill press chuck or milling machine spindle. Machinists, tool and die technicians, and general metalworkers are the primary installers of this type of tooling.

This countersink is appropriate for shop and field metalworking applications where flat-head screws or bolts require a properly angled seat. The 90-degree included angle is one of the most common standards for unified inch fastener seating. The 6-flute geometry reduces chatter compared to single-flute designs, producing a smoother finish in ferrous and non-ferrous metals. It fits standard 1/2 inch capacity chucks used on drill presses, lathes, and CNC machining centers.

Key Features

• 3/4 inch head diameter for countersinking standard flat-head fastener holes
• 90-degree included angle matches common unified inch fastener specifications
• 6-flute design reduces chatter and improves surface finish quality
• High speed steel construction provides durability across repeated cuts
• Straight-cylindrical 1/2 inch shank for broad chuck compatibility

Compatibility

Designed as an OEM-style replacement or direct-use countersink for drill presses, lathes, and milling machines equipped with a 1/2 inch capacity chuck or collet system.

Installation Notes

Installation is performed by machinists or metalworking technicians. Secure the straight-cylindrical shank fully in the chuck before operation and confirm the spindle is at a complete stop before adjusting depth or removing the tool. Use appropriate cutting fluid for ferrous metals to extend tool life and improve finish quality. Always wear eye protection when operating rotary cutting tools.