Hertel 18680 Countersink 1 in 90 Degree 4 Flute Hss

Product Description

The HERTEL 18680 is a 4-flute countersink designed for producing clean, accurate 90-degree countersunk seats in metal workpieces. Built from high speed steel, this tool handles the repeated friction and heat generated during countersinking operations in production and maintenance environments. The 1-inch head diameter and 1/2-inch straight cylindrical shank make it compatible with standard drill presses, milling machines, and hand-held drilling equipment. Machinists, tool-and-die workers, and general metalworking professionals install this tool when preparing fastener seats in steel, aluminum, and similar materials.

This countersink is suited for metalworking applications requiring precise 90-degree chamfers ahead of flat-head fastener installation. It performs in both light production runs and job-shop environments where consistent seat geometry is required. The straight cylindrical shank seats directly into standard collets or drill chucks without adapters, keeping setup straightforward. Applications include countersinking clearance holes in structural components, sheet metal assemblies, and machined parts where flush fastener seating is specified.

Key Features

• 90-degree included angle matches the geometry of standard flat-head machine screws and bolts
• 4-flute design distributes cutting load for smoother finish and reduced chatter
• High speed steel construction provides heat resistance for dry or lightly lubricated cutting
• 1/2-inch straight cylindrical shank fits standard collets and drill chucks without adapters
• 1-inch head diameter accommodates a wide range of fastener sizes in common metalworking applications

Compatibility

Designed as an OEM-style replacement or standard tooling option for use in drill presses, milling machines, and CNC equipment fitted with collets or drill chucks accepting a 1/2-inch straight cylindrical shank.

Installation Notes

Installation and operation should be performed by qualified machinists or tooling technicians familiar with rotary cutting tool safety. Power down and lock out the machine before loading or unloading the countersink from the chuck or collet. Ensure the shank is fully seated and the chuck or collet is tightened to the machine manufacturer's specification before operation. Apply cutting fluid as appropriate for the workpiece material to extend tool life and improve finish quality.