Hertel 331-006550 Countersink 1/2in 60 Degree 1 Flute Alloy Steel

Product Description

The HERTEL 331-006550 is a single-flute countersink designed for deburring, chamfering, and countersinking operations in alloy steel, cast iron, and glass-reinforced plastic. The tool features a 1/2 inch head diameter with a 60-degree included angle and a 30-degree centerline angle, making it well suited for standard fastener seat preparation. The 3/8 inch straight-cylindrical shank fits common drill chucks and milling machine collets. The bright, uncoated finish indicates no additional heat treatment coating, which is typical for general-purpose cutting tools used in light to medium machining tasks. Licensed machinists and tool-and-die technicians are the primary installers of this type of cutting tool.

This countersink is intended for use in machine shop, maintenance, and fabrication environments where precise chamfer angles are required before fastener seating. It performs in materials including alloy steel, cast iron, and glass-reinforced plastic. The single-flute design reduces chatter and improves surface finish on harder materials, making it a practical choice for manual drill press operations as well as CNC setups requiring controlled entry cuts. It ships as an individual unit with no pilot included.

Key Features

• 1/2 inch head diameter with a 60-degree included angle for standard fastener countersinking
• Single-flute geometry reduces chatter and produces a cleaner chamfer in hard materials
• 3/8 inch straight-cylindrical shank for compatibility with standard drill chucks and collets
• Bright uncoated alloy steel construction — no special coating required for general-purpose use
• Right-hand cutting direction for use with standard clockwise-rotation spindles
• No pilot included — suitable for use where the operator controls centering independently

Compatibility

Designed for countersinking operations in alloy steel, cast iron, and glass-reinforced plastic workpieces. Fits any drill press, milling machine, or hand drill accepting a 3/8 inch straight-cylindrical shank.

Installation Notes

This tool is installed by machinists, maintenance technicians, or fabricators using standard drill chuck or collet toolholding equipment. Secure the shank fully in the chuck before operation and confirm the spindle rotates in the right-hand direction before engaging the workpiece. Use appropriate cutting speed for the workpiece material — excessive speed can reduce tool life on alloy steel and cast iron. Always wear eye protection and secure the workpiece with appropriate fixturing before beginning the cut.