Hertel 331-205090 Carbide Countersink 3/8 in 110 Degree

Product Description

The HERTEL 331-205090 is a single-flute carbide countersink designed for producing accurate conical recesses in metal and other hard materials. With a 3/8-inch head diameter and a 110-degree included angle, this tool creates clean, precise countersunk seats for flathead fasteners in demanding machining applications. The straight-cylindrical shank measures 3/8 inch in diameter, allowing it to seat securely in standard drill chucks and collet holders. Carbide construction delivers hardness and wear resistance well beyond high-speed steel, making this countersink a practical choice for production environments and tool rooms where extended tool life matters.

This countersink is suited for metalworking operations in machine shops, manufacturing facilities, and maintenance environments. The single-flute geometry is particularly effective in materials that work-harden or where chatter control is a priority, such as stainless steel, hardened alloys, and non-ferrous metals. It is installed by machinists and tool room technicians working on CNC machines, manual drill presses, and hand-held drilling equipment where a consistent countersink profile is required.

Key Features

• 3/8-inch head diameter sized for standard flathead fastener applications
• 110-degree included angle provides a wide-profile countersink seat
• Single-flute design reduces chatter and improves finish in difficult-to-machine materials
• Solid carbide construction for extended wear life compared to HSS alternatives
• Straight-cylindrical shank for universal compatibility with chucks and collets

Compatibility

Designed as a direct-use countersink tool compatible with standard 3/8-inch drill chucks, collet holders, and quick-change tooling systems that accept straight-cylindrical shanks.

Installation Notes

This tool is installed by machinists and maintenance technicians. Always power down and lock out the machine before changing tooling. Secure the shank fully in the chuck or collet to the manufacturer-recommended engagement depth before operation. Use appropriate cutting fluid or coolant for the workpiece material to maximize tool life and surface finish quality.