Hertel 300-007004 Combo Drill Countersink Solid Carbide

Product Description

The HERTEL 300-007004 is a solid carbide combination drill and countersink designed to drill a pilot hole and countersink in a single pass. It carries a No. 4 trade size with a 5/16-inch body diameter and a 1/8-inch drill point diameter. The 118-degree drill point angle and 90-degree included countersink angle are standard for general metalworking and precision machining applications. The bright polished finish reduces friction and aids chip evacuation. At 4 inches overall length, this is classified as a long-length tool, providing additional reach in deep or hard-to-access setups. Right-hand cutting direction and a plain cutting edge style make it compatible with conventional CNC and manual drill press operations.

This combo drill countersink is suited for metalworking shops, machine shops, and production environments where consistent countersink depth and angle are required. The double-end style extends tool life by providing two usable ends before replacement. It is appropriate for use in ferrous and non-ferrous metals where a clean, burr-free countersink seat is required for fastener flush-mount applications. Machinists, tool and die makers, and CNC operators are the primary users of this tool type.

Key Features

• Solid carbide construction for hardness, wear resistance, and performance in demanding materials
• Combination drill and countersink completes pilot and countersink in one operation, reducing cycle time
• Double-end design provides two cutting ends for extended tool life
• 118-degree drill point angle and 90-degree included angle match standard fastener countersink geometry
• Bright polished finish minimizes friction and supports chip flow
• Long-length classification at 4 inches OAL for added reach in deeper setups

Compatibility

Designed as a standard No. 4 combination drill and countersink for use in conventional drill presses, CNC machining centers, and manual milling machines that accept 5/16-inch body tooling.

Installation Notes

This tool is installed and operated by machinists or toolroom professionals. Secure the tool firmly in an appropriate collet or drill chuck rated for the body diameter before operation. Ensure the spindle is fully stopped before changing or inspecting the tool. Follow shop safety protocols and applicable OSHA machine guarding standards when operating drilling and milling equipment.