Hertel 18687 Countersink 1-1/4 in 60 Degree 4 Flute Hss

Product Description

The HERTEL 18687 is a 4-flute countersink designed for producing clean, chamfered entry holes in metal and other materials. With a 1-1/4 inch head diameter and a 60-degree included angle, it is suited for creating countersunk seats for flat-head fasteners and deburring drilled holes. The straight cylindrical shank measures 1/2 inch in diameter, making it compatible with standard drill chucks and milling machine collets. Constructed from high speed steel, the 18687 maintains cutting edge integrity across a range of ferrous and non-ferrous workpiece materials. Machinists and tool-and-die professionals rely on this style of countersink for both production and maintenance applications.

This countersink is appropriate for use in manual drill presses, CNC machining centers, and manual mills where a 60-degree countersink profile is required. Common applications include preparing bolt holes for flat-head cap screws, deburring through-holes, and chamfering entry edges prior to tapping. The 4-flute geometry provides a smoother cut and better surface finish compared to single-flute designs, making it a practical choice for finish-quality work in fabrication shops, maintenance facilities, and production environments.

Key Features

• 1-1/4 inch head diameter delivers coverage for larger fastener seat diameters
• 60-degree included angle matches standard flat-head fastener profiles
• 4-flute design provides a smoother cutting action and improved surface finish
• High speed steel construction withstands heat buildup during continuous cutting
• 1/2 inch straight cylindrical shank fits standard drill chucks and collets

Compatibility

Designed as an OEM-style cutting tool suitable for use in drill presses, milling machines, and CNC machining centers equipped with a 1/2 inch chuck or collet system.

Installation Notes

Installation of this countersink should be performed by a qualified machinist familiar with rotating cutting tool safety practices. Secure the shank fully in a properly sized chuck or collet before operation and verify runout is within acceptable limits. Always power down and lock out the machine before changing or adjusting tooling. Use appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish.