Hertel 300-006004 Combo Drill Countersink 5/16 in Solid Carbide

Product Description

The HERTEL 300-006004 is a solid carbide combination drill and countersink designed for precision hole preparation and countersinking in a single operation. Built for trade and production machining environments, this tool features a 5/16-inch body diameter, a 1/8-inch drill point diameter, and an 82-degree included angle. The bright, uncoated finish is standard for solid carbide tooling used across a wide range of materials. At 4 inches overall length, it falls into the long-length category, giving machinists and toolroom technicians extended reach when access depth is a factor. Right-hand cutting direction and a plain cutting edge style make setup straightforward on conventional drilling or milling equipment.

This combination drill countersink is suited for metalworking applications where a pilot hole and countersink must be produced in one pass. It handles countersinking tasks on ferrous and non-ferrous materials in job shop, production, and maintenance-repair-operations settings. The double-end configuration extends tool life by providing two usable cutting ends. Trade size 4 corresponds to the standard screw size this tool is dimensioned to prepare. Machinists, toolroom techs, and precision fabricators working on close-tolerance assemblies will find the solid carbide construction appropriate for demanding materials and high-cycle runs.

Key Features

• Solid carbide construction for extended tool life in hard and abrasive materials
• 82-degree included angle — standard for most machine screw countersink applications
• Double-end design provides two cutting ends, reducing per-hole tooling cost
• Long-length tool at 4 inches OAL for applications requiring extended reach
• Bright uncoated finish compatible with a wide range of cutting fluids and materials
• Right-hand cut, plain cutting edge — compatible with standard drill press and CNC setups

Compatibility

Designed as an OEM-style replacement or direct substitute for trade size 4 combination drill countersinks used in standard machine screw countersink preparation across metalworking and fabrication applications.

Installation Notes

This tool is installed and used by machinists and toolroom technicians on drill presses, CNC machining centers, or manual milling machines. Secure the shank in a collet or drill chuck rated for the 5/16-inch body diameter before use. Ensure the spindle is fully stopped and the machine is powered down before changing or inspecting the tool. Use appropriate cutting fluid for the workpiece material to prevent premature carbide wear.