Hertel 331-207100 Carbide Countersink 5/8 in 120 Degree

Product Description

The HERTEL 331-207100 is a single-flute carbide countersink designed for creating precise angled seat profiles in metal and other hard materials. With a 5/8 inch head diameter and a 120-degree included angle, this tool produces clean, accurate countersunk recesses for flat-head fasteners. The straight-cylindrical shank measures 5/8 inch in diameter, allowing it to seat securely in standard drill chucks and collet holders. Carbide construction provides extended cutting life compared to high-speed steel alternatives, making this countersink well suited for production environments and repeated use on hard or abrasive workpieces. Machinists and toolroom technicians are the primary users of this type of cutting tool.

This countersink is used in metalworking applications where a 120-degree seat angle is required, which is common for certain aerospace and industrial fastener standards. It is suited for use on CNC machining centers, manual knee mills, and drill presses. The single-flute geometry reduces chatter and promotes accurate hole geometry, particularly in materials that tend to work-harden. Typical applications include deburring, chamfering, and preparing fastener seating surfaces in steel, stainless steel, aluminum, and similar materials.

Key Features

• 5/8 inch head diameter for standard fastener countersink profiles
• 120-degree included angle matches specific flat-head fastener seat requirements
• Single-flute design minimizes chatter and improves hole accuracy
• Solid carbide construction for extended tool life on hard and abrasive materials
• 5/8 inch straight-cylindrical shank for compatibility with standard chucks and collets

Compatibility

Designed for use in standard drill chucks and collet holders accepting a 5/8 inch straight-cylindrical shank, suitable for CNC and manual machine tool applications requiring a 120-degree countersink angle.

Installation Notes

This tool is installed and used by machinists and toolroom professionals. Secure the shank fully in a collet or drill chuck before operation and verify runout with an indicator where precision seating is critical. Always bring the spindle to a stop before changing or inspecting the tool. Follow applicable shop safety protocols and machine manufacturer guidelines for cutting speeds and feed rates appropriate to the workpiece material.