Hertel 18634 Countersink 1/2 in 4 Flute Hss Straight Shank

Product Description

The HERTEL 18634 is a high speed steel countersink designed for creating clean, angled seat profiles in metal, plastic, and composite workpieces. It features a 1/2 inch head diameter, a 100-degree included angle, and 4 flutes for smooth chip evacuation and consistent finish quality. The straight cylindrical shank measures 3/8 inch in diameter, making it compatible with standard drill chucks and collet holders used in metalworking and machining operations. This countersink is suited for production and maintenance shop use where precise countersunk hole preparation is required before fastener seating.

This tool is used in general metalworking, fabrication, and maintenance applications where countersunk fastener recesses are required. The 100-degree included angle accommodates a range of flat-head machine screws and aerospace-style fastener seat angles. It is appropriate for use in both manual and CNC drilling setups. Machinists, tool and die technicians, and maintenance trades use this style of countersink for deburring and seating operations across ferrous and non-ferrous materials.

Key Features

• 1/2 inch head diameter for medium-range countersunk hole preparation
• 100-degree included angle suits common flat-head fastener geometries
• 4 flutes provide balanced cutting action and efficient chip clearance
• High speed steel construction offers good wear resistance across a range of workpiece materials
• 3/8 inch straight cylindrical shank fits standard drill chucks and collet systems

Compatibility

Designed as an OEM-style replacement or standard countersink tool for use with 3/8 inch straight-shank drill chucks and collet holders in metalworking, fabrication, and maintenance shop environments.

Installation Notes

A licensed machinist or qualified tradesperson should secure the shank fully in the chuck or collet before operation. Ensure the workpiece is firmly clamped before applying cutting pressure to prevent tool deflection or workpiece movement. Inspect the cutting edges for wear or chipping before each use. Follow applicable shop safety codes and wear appropriate eye protection during all countersinking operations.