Hertel 336-203070 Countersink 1/4 in 90 Deg 6 Flute Carbide

Product Description

The HERTEL 336-203070 is a solid carbide countersink designed for producing clean, chamfered seat profiles in metal and other hard materials. With a 1/4-inch head diameter, a 90-degree included angle, and six flutes, this tool delivers smooth cutting action and a fine finish in precision deburring, countersinking for flat-head fasteners, and edge-chamfering operations. The straight-cylindrical shank measures 1/4 inch in diameter, making it compatible with standard drill chucks and collet-style toolholding systems. Machinists, tool-and-die technicians, and metalworking fabricators use this type of countersink for both manual and CNC machine applications.

This countersink suits light- to medium-duty metalworking applications where tight tolerances and a clean seating surface are required. The 90-degree included angle matches the standard geometry for most flat-head machine screw and bolt installations. The six-flute design reduces chatter compared to lower-flute-count countersinks, producing a finer surface finish in a single pass. Typical applications include precision sheet metal work, fixture fabrication, and aerospace or industrial component preparation where controlled countersink depth and angle accuracy are critical.

Key Features

• 1/4-inch head diameter provides compact geometry for small-fastener seating and tight clearance applications
• 90-degree included angle matches standard flat-head fastener geometry
• Six-flute design minimizes chatter and produces a finer finish than 3- or 4-flute alternatives
• Solid carbide construction offers superior hardness and wear resistance compared to high-speed steel
• Straight-cylindrical shank fits standard drill chucks and collet holders
• Tip diameter of 0.050 inches enables accurate pilot entry and consistent seat geometry

Compatibility

Designed as a standard-geometry countersink for use with straight-shank drill chucks and collet toolholding systems accepting a 1/4-inch shank diameter.

Installation Notes

This tool is installed and used by machinists and metalworking technicians in drill press, milling machine, or CNC machining center setups. Secure the shank firmly in a collet or drill chuck before operation, and verify that spindle speed is appropriate for the workpiece material and tool diameter. Carbide tooling is brittle — avoid side-loading or impact contact, and never use on interrupted cuts without confirming the tool is rated for that application. Power down and de-energize all equipment before changing tooling.