Hertel 18775 Countersink 1/2 in 90 Degree 4 Flute Hss

Product Description

The HERTEL 18775 is a high speed steel countersink designed for producing conical seat profiles in metal, plastic, and composite materials. It features a 90-degree included angle and four flutes, which distribute cutting load evenly and promote clean chip evacuation during operation. The 1/2-inch head diameter and straight cylindrical shank make it compatible with standard drill chucks and collet holders found on drill presses, CNC machining centers, and hand-held power drills. Machinists, tool and die technicians, and maintenance mechanics reach for this type of tool when deburring drilled holes or preparing fastener seats for flush or countersunk screw installations.

This countersink is suited for general-purpose machining and fabrication applications in both production shop and maintenance environments. The four-flute geometry is well matched to harder workpiece materials where a multi-flute tool provides better surface finish and dimensional accuracy than single- or double-flute alternatives. Typical applications include countersinking pilot holes for flat-head machine screws and preparing mating surfaces in structural assemblies. The straight cylindrical shank seats directly into standard drill chucks without requiring a specialized holder, making it practical for field maintenance work as well as bench operations.

Key Features

• 90-degree included angle for standard flat-head fastener seat geometry
• Four flutes for balanced cutting action and efficient chip removal
• 1/2-inch head diameter provides sufficient coverage for common screw sizes
• 1/2-inch straight cylindrical shank fits standard drill chucks and collet systems
• High speed steel construction offers toughness and resistance to heat buildup during cutting

Compatibility

Designed as a general-purpose countersink for use in standard drill chucks, collet holders, and CNC tool holders accepting a 1/2-inch straight cylindrical shank. Suitable for machining and fabrication applications involving metal, plastic, and composite materials.

Installation Notes

Secure the shank firmly in a properly sized chuck or collet before operation and verify the tool runs true before engaging the workpiece. Use appropriate cutting fluid or lubricant for the workpiece material to extend tool life and improve finish quality. Eye protection and appropriate personal protective equipment are required when operating rotary cutting tools. Inspect the cutting edges for chipping or wear before each use and do not operate a damaged tool.