Hertel 18304 Countersink 5/16 in 82 Deg 6 Flute Hss

Product Description

The HERTEL 18304 is a single-use countersink designed for creating chamfered seat profiles in metal, wood, and composite materials prior to fastener installation. Built from high speed steel (HSS), it delivers consistent cutting performance across a range of substrate hardnesses. The 82-degree included angle matches the standard head geometry for flat-head machine screws and bolts. The 5/16-inch head diameter and 5/16-inch straight cylindrical shank make it compatible with standard drill chucks. Six flutes provide smooth, chatter-resistant cutting action and efficient chip evacuation, producing clean, accurate countersink profiles with minimal hand dressing required.

This countersink is suited for light machining, assembly line prep work, and maintenance applications where flat-head fasteners must sit flush with the workpiece surface. It is a standard-size tool used by machinists, millwrights, and maintenance technicians working with ferrous and non-ferrous metals. The straight cylindrical shank seats directly in drill press chucks, hand drills, or CNC spindles without adapters. It is commonly applied in sheet metal fabrication, equipment repair, and general manufacturing environments requiring precise countersink geometry.

Key Features

• 82-degree included angle matches standard flat-head fastener head geometry
• High speed steel construction for durability across a range of materials
• 6-flute design reduces chatter and promotes smooth chip clearance
• 5/16-inch straight cylindrical shank fits standard drill chucks without adapters
• 5/16-inch head diameter suitable for light to medium fastener prep work

Compatibility

Designed as a standard straight-shank countersink for use in drill presses, hand drills, and CNC spindles accepting a 5/16-inch cylindrical shank.

Installation Notes

Installation is performed by machinists and maintenance technicians using standard drill equipment. Secure the workpiece before operation and run at a speed appropriate for the substrate material to avoid overheating the cutting edges. Inspect the flutes for wear or damage before use. Do not force the tool into hardened materials beyond the HSS rating.