Helical Solutions 81406 Square End Mill 5/16 in 3 Flute Carbide

Product Description

The HELICAL SOLUTIONS 81406 is a 3-flute solid carbide square end mill designed for high-efficiency material removal in aluminum and non-ferrous metals. It carries a Zplus ZrN (zirconium nitride) coating that reduces built-up edge and improves surface finish on gummy materials. The 0.3125-inch mill diameter pairs with a 0.4375-inch length of cut and a 40-degree helix angle optimized for chip evacuation in aluminum. A variable-pitch flute spacing reduces harmonic vibration during cutting, making it well suited for high-speed machining operations. This tool is centercutting and right-hand cutting with a straight shank, intended for use by machinists and CNC tooling professionals in shop and production environments.

This end mill is built for aluminum and non-ferrous workpiece materials and fits standard milling applications where a 5/16-inch diameter tool is required. Typical use cases include profiling, slotting, and plunging in aluminum billet, plate, cast aluminum, copper, brass, and similar soft non-ferrous alloys. The single-end, straight shank design seats directly in standard collet chucks and end mill holders. It is part of the HELICAL SOLUTIONS End Mills for Aluminum 3 Flute Square 40 degree Helix Variable Pitch series, making it a purpose-built tool rather than a general-purpose option.

Key Features

• 0.3125-inch (5/16 inch) mill diameter with matching 0.3125-inch straight shank for direct collet mounting
• 3-flute variable-index geometry reduces chatter and harmonic vibration during high-speed passes
• 40-degree right-hand helical flutes promote aggressive chip evacuation in aluminum and non-ferrous materials
• Zplus ZrN coating resists built-up edge and extends tool life on soft, adhesive materials
• Centercutting design allows plunge entry without a pre-drilled pilot hole
• Solid carbide construction throughout for rigidity and dimensional stability under thermal load

Compatibility

Designed for use in aluminum and non-ferrous machining applications as part of the HELICAL SOLUTIONS End Mills for Aluminum 3 Flute Square 40 degree Helix Variable Pitch series. Fits any milling machine or machining center equipped with a holder accepting a 0.3125-inch straight shank.

Installation Notes

Install in a clean, properly sized collet or end mill holder rated for the intended spindle speed and feed rate. Ensure the machine spindle is fully stopped and the control is in a safe state before changing tooling. Follow your machine tool builder guidelines and ANSI B11 safety standards for milling operations. Do not exceed the tool manufacturer recommended speeds and feeds for the specific workpiece material and depth of cut.