Hertel 333-009070 Carbide Countersink 7/8 in 90 Degree 3 Flute

Product Description

The HERTEL 333-009070 is a solid carbide countersink designed for accurate, clean-entry hole preparation in metal and other hard materials. With a 7/8-inch head diameter and a 90-degree included angle, it produces the standard countersunk seat geometry required for flat-head fasteners across a wide range of production and maintenance applications. The straight cylindrical shank measures 1/2 inch in diameter, making it compatible with standard drill chucks and collet holders. Three flutes provide a balance of chip clearance and cutting stability. The bright, uncoated finish is suited for general-purpose countersinking where coating is not required. Installers and machinists working in fabrication, electrical enclosure prep, or mechanical assembly will find this tool handles typical ferrous and non-ferrous stock with consistent geometry.

This countersink is intended for use in drilling and machining operations where a 90-degree countersunk seat is required. It is a single-end tool with no pilot, meaning the operator controls centering through the existing pilot hole. The 3-flute configuration suits light-to-medium feeds in production environments as well as manual drill press or hand-drill use. It is appropriate for electricians, pipefitters, fabricators, and maintenance technicians who need repeatable countersink geometry when mounting hardware flush to panel or structural surfaces.

Key Features

• 7/8-inch head diameter with 90-degree included angle produces standard flat-head fastener seat geometry
• Solid carbide construction for extended tool life in harder workpiece materials
• 1/2-inch straight cylindrical shank fits standard drill chucks and collet holders
• 3-flute design balances chip evacuation and cutting stability
• Bright, uncoated finish for general-purpose countersinking applications
• Right-hand cut, single-end, no pilot — operator-guided centering via existing pilot hole

Compatibility

Designed for use with standard 1/2-inch drill chucks and collet-style holders on drill presses, CNC machining centers, or hand-held power drills. Suitable for countersinking ferrous and non-ferrous materials where a 90-degree seat angle is specified.

Installation Notes

Installation and use of this countersink should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Secure the workpiece firmly before operation and verify the pilot hole diameter matches the fastener shank before countersinking. Always wear appropriate eye protection and ensure the spindle speed is appropriate for the workpiece material and tool diameter. Inspect the cutting edges before each use and replace if chipping or wear is observed.