Hertel 300-001010 Combo Drill Countersink Size 8

Product Description

The HERTEL 300-001010 is a solid carbide combo drill countersink designed to drill and countersink in a single pass. Built for precision metalworking applications, this tool combines a 5/16-inch drill point with a 60-degree included angle countersink into one rigid body. The 3/4-inch body diameter and 3-1/2-inch overall length (OAL) provide stability and reach in production and repair environments. Solid carbide construction delivers hardness and wear resistance well beyond high-speed steel, making it suitable for harder materials and higher-cycle operations. Installed by machinists, toolmakers, and skilled trade professionals in shop or field settings.

This combo drill countersink is sized for No. 8 fastener applications. It is used when a countersunk seat must be produced in a single operation, reducing setup time and tool changes. The right-hand cut and plain cutting edge style make it compatible with standard clockwise-rotation machine spindles including drill presses, CNC machining centers, and manual mills. The double end type extends usable tool life by providing two working ends.

Key Features

• Solid carbide body for superior hardness and wear resistance versus high-speed steel
• 60-degree included angle countersink matches standard No. 8 flat-head fastener geometry
• 5/16-inch drill point diameter and 5/16-inch drill point length for accurate pilot hole sizing
• Double end design extends service life by providing two usable cutting ends
• Right-hand cut, plain cutting edge - compatible with standard clockwise-rotation spindles
• 3/4-inch body diameter and 3-1/2-inch OAL for rigidity and reach in production environments

Compatibility

Designed for use in standard drill presses, CNC machining centers, and manual milling machines with clockwise-rotation spindles accepting a 3/4-inch shank. Sized for No. 8 flat-head fastener countersink applications.

Installation Notes

This tool should be installed and operated by qualified machinists or trade professionals familiar with rotating cutting tools. Secure the tool firmly in the machine chuck or collet before operation and verify spindle speed is appropriate for the workpiece material and tool diameter. Always power down and lock out the machine before changing or inspecting the tool. Carbide is brittle - avoid lateral loading or impact that can chip the cutting edges.