Hertel 18665 Countersink 7/8in 82 Degree 4 Flute Hss

Product Description

The HERTEL 18665 is a 4-flute high speed steel countersink designed for deburring and chamfering operations in metal fabrication and machining applications. The tool features a 7/8 inch head diameter and an 82-degree included angle, making it well suited for creating flush-seat recesses for flat-head fasteners. The straight cylindrical shank measures 1/2 inch in diameter for secure chuck engagement. High speed steel construction provides reliable performance across a range of workpiece materials including mild steel, aluminum, and plastics. This countersink is a standard production tool used by machinists, tool and die workers, and maintenance technicians.

This countersink is used in drilling and finishing operations where a consistent chamfer or fastener seat is required. Typical applications include sheet metal fabrication, machine assembly, and general metalworking where flat-head screws or rivets must sit flush with the workpiece surface. The 82-degree angle conforms to standards commonly associated with flat-head fastener seat geometry in aerospace and general industrial use. The 1/2 inch shank accommodates standard drill press chucks and milling machine tool holders.

Key Features

• 7/8 inch head diameter for a wide chamfer footprint
• 82-degree included angle for flush flat-head fastener seating
• 4 flutes for smooth cutting action and chip clearance
• High speed steel construction for durability across common workpiece materials
• 1/2 inch straight cylindrical shank for standard chuck compatibility

Compatibility

Designed as a standard single-end countersink for use with drill presses, milling machines, and hand-held power drills equipped with a 1/2 inch or larger chuck.

Installation Notes

Installation and use should be performed by a qualified machinist or trained technician. Secure the shank firmly in the chuck before operation and confirm the workpiece is properly clamped. Use appropriate cutting speed for the workpiece material and apply cutting fluid when working with harder metals to extend tool life. Inspect the cutting edges for wear before each use.