Hertel 331-006570 Countersink 0.5 in 90 Deg 1 Flute Alloy Steel

Product Description

The HERTEL 331-006570 is a single-flute countersink designed for deburring and seat-forming operations in metalworking and fabrication applications. It features a 0.5-inch head diameter and a 90-degree included angle, which translates to a 45-degree centerline angle. The 0.375-inch straight cylindrical shank provides a secure grip in standard drill chucks and collet holders. Constructed from alloy steel with a bright, uncoated finish, this countersink is suited for production and maintenance shops requiring a reliable, right-hand cutting tool for precise countersink profiles.

This countersink is used in drilling and finishing operations on alloy steel, cast iron, and glass-reinforced plastic workpieces. It is a single-end tool without a pilot, making it appropriate for guided setups where the operator controls depth and alignment manually. Typical applications include fastener seat preparation, chamfering, and deburring on ferrous and reinforced composite materials in both shop and field environments.

Key Features

• 0.5-inch head diameter with 90-degree included angle for standard fastener seat profiles
• Single-flute geometry for clean cutting action on alloy steel, cast iron, and glass-reinforced plastic
• 0.375-inch straight cylindrical shank for compatibility with common drill chucks and collet holders
• Right-hand cut direction for conventional CW spindle operation
• Bright, uncoated finish — no coating to chip or delaminate during interrupted cuts
• No pilot included — suited for setups where centering is controlled by the workholding fixture

Compatibility

Designed as an OEM-style replacement or direct-use countersink for metalworking operations on alloy steel, cast iron, and glass-reinforced plastic substrates. Compatible with any drill press, milling machine, or hand drill accepting a 0.375-inch straight cylindrical shank.

Installation Notes

Installation is performed by machinists and tool-and-die or maintenance professionals familiar with rotary cutting tools. Secure the shank fully in the chuck or collet before operation and verify spindle runout is within acceptable limits to avoid chatter and premature tool wear. Power down the spindle and allow it to come to a complete stop before changing or adjusting the tool. Always wear appropriate eye protection and follow shop safety protocols when operating countersinking tools.