Hertel 331-001070 Countersink 1/8 in 90 Degree 1 Flute

Product Description

The HERTEL 331-001070 is a single-flute countersink designed for precision chamfering and seat preparation in alloy steel, cast iron, and glass-reinforced plastic. The tool features a 1/8 inch head diameter and a 90-degree included angle, which corresponds to a 45-degree centerline angle. The straight-cylindrical shank measures 1/8 inch in diameter, making it compatible with standard collet and drill chuck setups. The bright, uncoated finish indicates no additional surface treatment, which is typical for general-purpose tooling used in controlled machining environments. This countersink is intended for machinists, tool and die technicians, and precision metalworkers performing small-diameter countersinking operations.

This countersink is suited for light-duty countersinking applications on alloy steel, cast iron, and glass-reinforced plastic workpieces. Its small 1/8 inch head diameter makes it well-suited for fine detail work, small fastener seat preparation, and deburring tasks where larger tools would be impractical. It is commonly used in machine shops, maintenance and repair operations, and production environments requiring accurate, repeatable chamfer geometry on small-diameter holes.

Key Features

• 1/8 inch head diameter for small-diameter countersinking work
• 90-degree included angle (45-degree centerline angle) for standard fastener seat geometry
• Single flute design for clean cutting in alloy steel and cast iron
• Right-hand cut direction for conventional spindle rotation
• 1/8 inch straight-cylindrical shank fits standard collets and drill chucks
• Bright, uncoated finish — no thermal or chemical coating to affect tolerances
• Rated for alloy steel, cast iron, and glass-reinforced plastic material applications

Compatibility

Designed for use on alloy steel, cast iron, and glass-reinforced plastic workpieces. The 1/8 inch straight-cylindrical shank fits standard collet systems and drill chucks sized to accept 1/8 inch tooling.

Installation Notes

Installation and use of this countersink should be performed by qualified machinists or tooling technicians. Secure the shank firmly in the collet or chuck before operation and verify runout is within acceptable limits for the application. Always power down and lock out the machine spindle before changing tooling. Do not exceed the recommended RPM range for the material being machined and the tool diameter in use.