Hertel 331-208070 Countersink 3/4 in 90 Degree Solid Carbide

Product Description

The HERTEL 331-208070 is a single-flute solid carbide countersink designed for producing clean, accurate chamfered entry holes in metal and hard materials. With a 3/4 inch head diameter and a 90-degree included angle, this tool delivers consistent conical seats for flathead fasteners in precision machining and fabrication applications. The straight-cylindrical shank measures 3/4 inch in diameter, providing secure tool holding in standard drill chucks and collet-style holders. Solid carbide construction offers superior hardness and wear resistance compared to high-speed steel, making it well-suited for higher-cycle production runs or hard-material work where edge retention matters.

This countersink is used in metalworking, aerospace component prep, general machining, and sheet metal fabrication where a 90-degree chamfer is required before fastener seating. The single-flute geometry reduces chatter and produces a smoother finish in the countersunk area. It is typically installed and operated by machinists, tool-and-die professionals, and skilled fabricators working on CNC machining centers, manual mills, or drill presses. Applications include countersinking for flathead machine screws, deburring operations, and chamfering pre-drilled holes in ferrous and non-ferrous metals.

Key Features

• 3/4 inch head diameter with a 90-degree included angle for standard flathead fastener seating
• Single-flute design reduces chatter and improves surface finish in the countersunk bore
• Solid carbide construction provides high hardness and extended edge life in hard or abrasive materials
• 3/4 inch straight-cylindrical shank fits standard chucks and collet holders without adapters
• Compact single-piece design with no moving parts or inserts to loosen during operation

Compatibility

Designed as an OEM-style replacement or direct-use countersink for metalworking setups requiring a 3/4 inch straight-shank, 90-degree solid carbide countersink in standard drill chucks, end mill holders, or collet chucks.

Installation Notes

This tool should be installed by a qualified machinist or tooling professional familiar with proper speeds and feeds for carbide cutting tools. Ensure the machine spindle is fully stopped and the tool holder is clean and free of debris before securing the shank. Carbide tooling is brittle and should not be subjected to side loads, interrupted cuts beyond design limits, or impacts that can chip the cutting edge. Follow the machine manufacturer and carbide tooling supplier guidelines for appropriate RPM and feed rate selection based on workpiece material.