Hertel 18518 Countersink 3/8 in 82 Deg 6 Flute Hss

Product Description

The HERTEL 18518 is a 6-flute countersink designed for producing clean, accurately angled seat cuts in metal, plastic, and composite materials. Built from high-speed steel, it features a 3/8 inch head diameter, an 82-degree included angle, and a 1/4 inch straight cylindrical shank. The 82-degree angle is common in aerospace and precision machining applications where flathead fastener seating requires a shallower profile than the standard 90-degree countersink. Machinists and fabricators use this tool in drill presses, CNC machining centers, and hand-operated drilling equipment. The multi-flute design reduces chatter and produces a smoother finish per pass compared to single- or three-flute styles.

This countersink is suited for light to medium-duty countersinking operations in job shops, maintenance facilities, and production environments. The 1/4 inch straight shank fits standard drill chucks and quick-change collet systems without adapters. The 82-degree geometry is typically specified for flathead machine screws and aerospace fasteners that call for this angle over the more common 90-degree style. It is sold as a single unit and is appropriate for bench work, fixture assembly, and general metalworking tasks where a consistent, repeatable countersink profile is required.

Key Features

• 82-degree included angle for aerospace and precision flathead fastener seating
• 6-flute design reduces chatter and improves surface finish
• High-speed steel construction provides durability across a range of workpiece materials
• 3/8 inch head diameter for moderate-size fastener applications
• 1/4 inch straight cylindrical shank fits standard drill chucks and collet holders
• 0.0780 inch tip diameter allows precise entry without excessive material removal

Compatibility

Designed as a standard single-piece countersink for use in drill presses, milling machines, and hand drills equipped with a 1/4 inch or larger chuck or collet. No specific model compatibility data was provided in the product input.

Installation Notes

Installation and use should be performed by a qualified machinist or fabricator familiar with cutting tool safety. Secure the shank fully in the chuck or collet before operation and verify the workpiece is clamped before applying feed pressure. Run at appropriate spindle speeds for the workpiece material to avoid overheating the cutting edges. Do not exceed the tool's rated capacity or apply lateral side loads that could deflect or snap the shank.