Hertel 18650 Countersink 5/8 in 120 Degree 4 Flute Hss

Product Description

The HERTEL 18650 is a single-pass countersink designed for creating clean, chamfered seat profiles in metal workpieces. Built from high speed steel, it delivers consistent cutting performance across a range of ferrous and non-ferrous materials. The 120-degree included angle suits standard fastener seating applications, and the 5/8-inch head diameter provides adequate coverage for common countersunk hole sizes. The straight-cylindrical shank measures 3/8 inch, making it compatible with standard drill chucks and collet holders. Machinists, tool and die workers, and maintenance technicians install this type of tooling during part prep, fixture work, and production deburring operations.

The HERTEL 18650 is suited for use in manual drill presses, CNC machining centers, and hand-held drilling setups where a 3/8-inch shank can be retained. The four-flute geometry helps maintain concentricity and reduces chatter compared to single-flute designs, which is important when working on precision assemblies or producing a clean surface finish at the countersunk entry point. Typical applications include aerospace, automotive, and general fabrication environments where consistent chamfer geometry is required prior to fastener installation.

Key Features

• 120-degree included angle matches standard flat-head and machine-screw countersink geometry
• 5/8-inch head diameter provides chamfer coverage for common fastener sizes
• 4-flute design improves cutting stability and surface finish quality
• High speed steel construction handles a broad range of workpiece materials
• Straight-cylindrical 3/8-inch shank fits standard drill chucks and collet systems

Compatibility

Designed as a direct-fit countersink for use with any drill press, machining center, or hand drill accepting a 3/8-inch straight-cylindrical shank; no specific OEM model compatibility was stated in the product data.

Installation Notes

This tooling is installed and operated by machinists or qualified maintenance personnel. Secure the shank firmly in the chuck or collet before operation and verify runout before beginning a cut. Always bring the spindle to a full stop before adjusting depth stops or changing tooling. Follow applicable shop safety procedures and machine guarding requirements during use.