Hertel 18776 Countersink 1/2 in 90 Degree 4 Flute Hss

Product Description

The HERTEL 18776 is a high speed steel countersink designed for creating clean, accurately angled seat recesses in metal and other machinable materials. It features a 90-degree included angle and a 1/2-inch head diameter, making it well suited for standard fastener seat preparation. The straight cylindrical shank measures 1/2 inch in diameter, allowing secure chuck retention in drill presses, CNC machining centers, and hand-held power drills. With four flutes, the tool distributes cutting load evenly and produces a smooth surface finish with minimal chatter. High speed steel construction provides good wear resistance and toughness across a broad range of work materials.

The HERTEL 18776 is used in metalworking, maintenance, and general fabrication environments where countersunk holes are required to seat flat-head fasteners flush with or below a workpiece surface. Typical applications include sheet metal work, structural fabrication, fixture building, and machine assembly. The 90-degree angle matches the seat geometry of the most common flat-head machine screws and bolts used in industrial and commercial applications. This tool is appropriate for production and job-shop settings where consistent, repeatable countersink geometry is needed.

Key Features

• 90-degree included angle for standard flat-head fastener seat preparation
• 1/2-inch head diameter covers common fastener sizes
• 4-flute design promotes smooth cutting action and reduced chatter
• High speed steel construction offers durability across a range of machinable materials
• Straight cylindrical 1/2-inch shank fits standard drill chucks and collets

Compatibility

Designed as a general-purpose countersink for use in drill presses, CNC machining centers, and power drills equipped with a standard chuck or collet accepting a 1/2-inch straight cylindrical shank.

Installation Notes

Installation and use should be performed by a qualified machinist or trained technician. Secure the shank firmly in the chuck or collet before operating and verify spindle speed is appropriate for the work material and tool diameter. Always wear appropriate eye protection and ensure the workpiece is clamped securely before starting the cut. Inspect the cutting edges before each use and remove the tool from service if chipping or excessive wear is observed.