Hertel 331-005050 Countersink 3/8 in 60 Degree 1 Flute

Product Description

The HERTEL 331-005050 is a single-flute countersink designed for precise countersinking operations in metalworking and fabrication applications. With a 3/8-inch head diameter and a 60-degree included angle, it produces clean, accurate seat profiles for flathead fasteners. The 1/4-inch straight cylindrical shank fits standard drill chucks and quick-change holders. The bright, uncoated alloy steel construction delivers solid performance across a range of workpiece materials. Licensed machinists, tool-and-die workers, and fabricators working with hand drills or drill presses will find this tool well-suited to production and maintenance tasks alike.

This countersink is rated for use in alloy steel, cast iron, and glass-reinforced plastic. The single-flute geometry reduces chatter and produces a smoother finish compared to multi-flute designs in harder materials. The straight cylindrical shank makes it compatible with standard collets and Jacobs-style chucks without the need for adapters. It is sold individually and is appropriate for both bench-top drill press use and portable drill applications in shop or field environments.

Key Features

• 3/8-inch head diameter with 60-degree included angle for standard flathead fastener seating
• Single-flute design reduces chatter and improves surface finish in harder materials
• 1/4-inch straight cylindrical shank fits standard drill chucks and collet holders
• Bright, uncoated finish — suitable for use with cutting fluid in alloy steel and cast iron
• Compatible with alloy steel, cast iron, and glass-reinforced plastic workpieces
• No pilot included — works as a standalone countersink without guide pin

Compatibility

Rated for countersinking operations in alloy steel, cast iron, and glass-reinforced plastic. Fits any drill press, hand drill, or milling machine spindle accepting a 1/4-inch straight cylindrical shank.

Installation Notes

Secure the shank firmly in the chuck before operation and verify concentricity to minimize runout. Apply cutting fluid when working with alloy steel or cast iron to extend tool life and improve finish quality. Set spindle speed appropriate to the workpiece material and head diameter — lower speeds are generally preferred for larger diameter countersinks in harder materials. Inspect the cutting edge before each use and replace the tool if chipping or wear is evident.