Hertel 336-005090 Countersink 3/8 in 120 Degree 6 Flute Carbide

Product Description

The HERTEL 336-005090 is a solid carbide countersink designed for creating chamfered seat profiles in metal and other hard materials. It features a 3/8 inch head diameter, a 120-degree included angle, and six flutes that distribute cutting load evenly for smooth, chatter-free results. The straight cylindrical shank measures 1/4 inch in diameter, making it compatible with standard drill chucks and collet holders. This countersink is suited for production and maintenance environments where consistent, clean countersink geometry is required on close-tolerance fastener holes.

This countersink is appropriate for use in machine shops, production facilities, and maintenance operations working with steel, cast iron, aluminum, and similar materials. The 120-degree included angle is commonly specified for flat-head fastener seating and chamfering applications. The six-flute geometry reduces vibration and improves surface finish compared to single- or three-flute designs, making it a practical choice for CNC machining centers, drill presses, and manual milling setups where finish quality matters.

Key Features

• Solid carbide construction for extended tool life in hard and abrasive materials
• 3/8 inch head diameter suits common countersink and chamfer requirements
• 120-degree included angle matches standard flat-head fastener specifications
• Six flutes provide balanced cutting action and improved surface finish
• 1/4 inch straight cylindrical shank fits standard chucks and collet toolholders

Compatibility

Designed as a standard-geometry countersink for use in drill presses, CNC machining centers, and milling machines equipped with a 1/4 inch collet or drill chuck capable of accepting a straight cylindrical shank.

Installation Notes

Installation and use of this countersink should be performed by qualified machinists or tooling technicians familiar with rotating cutting tool safety. Secure the straight shank fully within the collet or chuck before operation, and verify that spindle speed is appropriate for the workpiece material and tool diameter. Always power down and lock out the machine before changing tooling. Avoid side loading or using the tool beyond its rated head diameter to prevent premature wear or breakage.