Hertel 18617 Countersink 3/8 in 82 Degree 4 Flute Hss

Product Description

The HERTEL 18617 is a 4-flute high speed steel countersink designed for producing chamfered seat profiles in metal, wood, and composite materials. With a 3/8 inch head diameter and an 82-degree included angle, this tool creates accurate, clean countersunk recesses for flat-head fasteners. The straight-cylindrical 1/4 inch shank provides positive grip in standard drill chucks and quick-change collet systems. It is suited for use by machinists, tool-and-die technicians, and production shop personnel working in both manual and CNC drilling operations.

This countersink is intended for general shop and production use where consistent chamfer geometry is required. The 82-degree included angle matches the specification for flat-head machine screws and bolts common in metalworking and light fabrication applications. The 4-flute design helps reduce chatter and produces a smoother finish compared to single-flute styles, making it a practical choice for repetitive countersinking operations on ferrous and non-ferrous stock.

Key Features

• 3/8 inch head diameter for standard flat-head fastener seat preparation
• 82-degree included angle matches common flat-head machine screw geometry
• 4-flute construction reduces chatter and improves surface finish
• High speed steel construction provides good wear resistance across a range of materials
• 1/4 inch straight-cylindrical shank fits standard drill chucks and collets

Compatibility

Designed as an OEM-style replacement or direct-fit tool for 1/4 inch straight-shank countersink applications requiring an 82-degree included angle and 3/8 inch head diameter.

Installation Notes

This tool is installed by machinists or shop technicians in a drill press, hand drill, or CNC spindle equipped with a compatible 1/4 inch chuck or collet. Secure the shank fully before operation and confirm the workpiece is clamped to prevent movement. Use appropriate cutting fluid for ferrous materials to extend tool life and improve finish quality. Follow applicable shop safety standards for rotating cutting tools.