Hertel 331-003050 Countersink 1/4 in 60 Degree 1 Flute

Product Description

The HERTEL 331-003050 is a single-flute countersink designed for creating conical seat geometry in metal and composite workpieces. It features a 1/4-inch head diameter, a 60-degree included angle (30-degree centerline angle), and a straight cylindrical 1/4-inch shank for use in standard drill chucks and collet holders. The bright, uncoated alloy steel construction is suited for controlled material removal in ferrous and reinforced substrates. Machinists and fabricators use this tool when a clean, single-pass countersink is required without the chatter that can accompany multi-flute designs on interrupted or hard surfaces.

This countersink is intended for use on alloy steel, cast iron, and glass-reinforced plastic workpieces. It is a solid choice for single-end countersinking operations in production machining, maintenance, and fabrication environments where consistent seat geometry and repeatable depth are required. The straight shank makes it compatible with a wide range of standard toolholding setups on drill presses, CNC machining centers, and hand-held power tools. No pilot is included, so the operator controls entry alignment directly.

Key Features

• 1/4-inch head diameter with 60-degree included angle for standard fastener seat profiles
• Single-flute geometry reduces chatter on hard and interrupted materials
• Straight cylindrical 1/4-inch shank fits standard drill chucks and collet holders
• Bright uncoated finish on alloy steel body for general-purpose cutting applications
• Right-hand cut direction for conventional drilling setups
• Single-end tool with no pilot — suited for operator-guided entry alignment

Compatibility

Rated for use on alloy steel, cast iron, and glass-reinforced plastic. Designed as a general-purpose countersink for use with standard 1/4-inch straight-shank toolholding systems.

Installation Notes

Countersinks should be installed and operated by qualified machinists or fabricators familiar with rotary cutting tools. Secure the shank fully in the chuck or collet before operation and verify runout before cutting. Always power down the machine and bring the spindle to a full stop before changing tooling. Use cutting fluid or lubricant appropriate for the workpiece material to extend tool life and improve surface finish.