Hertel 18667 Countersink 7/8 in 90 Degree 4 Flute Hss

Product Description

The HERTEL 18667 is a 4-flute high speed steel countersink designed for producing clean, accurate 90-degree countersunk seats in metal, wood, and composite materials. With a 7/8-inch head diameter and a 1/2-inch straight cylindrical shank, this tool mounts in standard drill presses, milling machines, and hand-held power drills. The 90-degree included angle is the most common standard for flat-head fastener seating across commercial and industrial applications. High speed steel construction provides durability across a broad range of workpiece materials without the brittleness associated with carbide tooling in interrupted cuts.

This countersink is suited for machine shops, maintenance facilities, and production environments where consistent flat-head screw seating is required. The straight cylindrical shank accepts standard drill chucks without requiring specialized toolholders, making it practical for both bench-top and floor-standing drill press setups. Machinists, tool-and-die technicians, and general maintenance trades use this tool for deburring, chamfering, and countersinking operations on ferrous and non-ferrous stock.

Key Features

• 7/8-inch head diameter for wide countersink coverage on standard flat-head fastener patterns
• 90-degree included angle matches the most common flat-head screw specification
• 4-flute geometry provides balanced cutting action and reduced chatter
• High speed steel construction handles a broad range of materials including mild steel, aluminum, and plastics
• 1/2-inch straight cylindrical shank fits standard drill chucks and collet holders

Compatibility

Designed as a standard OEM-style countersink for use in drill presses, milling machines, and power drills equipped with a 1/2-inch or larger chuck capacity.

Installation Notes

Secure the workpiece firmly before operation to prevent movement during countersinking. Set spindle speed according to the workpiece material and tool diameter following standard machining practice for high speed steel tooling. Inspect the shank and chuck for runout before use to ensure a clean, concentric countersink seat. Always wear appropriate eye protection and power down the machine before changing or adjusting tooling.