Hertel 18506 Countersink 1/4 in 90 Degree 6 Flute Hss

Product Description

The HERTEL 18506 is a high-speed steel countersink designed for creating accurate, chamfered seat profiles in metal, wood, and composite materials. Built with a 90-degree included angle and six flutes, it delivers smooth cutting action and consistent surface finish in production and maintenance drilling operations. The straight cylindrical shank measures 1/4 inch in diameter, matching the head diameter, making it compatible with standard drill chucks and quick-change holders. Machinists, tool-and-die techs, and maintenance professionals reach for this countersink when preparing holes for flat-head fasteners or deburring drilled bores.

This countersink is suited for bench drill presses, CNC machining centers, and handheld drill-driver setups where a 1/4 inch shank tool is appropriate. Its six-flute geometry reduces chatter and produces a cleaner finish compared to single- or three-flute designs, making it a practical choice for repetitive fastener prep work on panels, frames, and fabricated assemblies. It ships as a single unit and is appropriate for both job-shop use and field maintenance applications.

Key Features

• 90-degree included angle for standard flat-head fastener seating
• Six flutes for reduced chatter and improved surface finish
• High-speed steel construction for durability across a range of workpiece materials
• 1/4 inch straight cylindrical shank fits standard drill chucks and quick-change holders
• 1/4 inch head diameter for small-diameter countersink applications

Compatibility

Designed as an OEM-style replacement or direct-use countersink for standard 1/4 inch straight-shank toolholders and drill chucks commonly used in bench, floor, and CNC drilling setups.

Installation Notes

A qualified machinist or maintenance technician should secure the shank fully in the chuck or collet before operation. Ensure the workpiece is firmly clamped to prevent movement during cutting. Run at appropriate speeds for the workpiece material per standard machining reference data. Inspect the cutting edges before use and replace if chipping or wear is evident.