Helical Solutions 01255 Square End Mill 5/16 in 3 Flute Carbide

Product Description

The HELICAL SOLUTIONS 01255 is a 3-flute solid carbide square end mill designed for high-performance milling in aluminum and non-ferrous materials. It measures 5/16 inch (0.3125 inches) in diameter with a 5/8-inch length of cut and a 2-1/2-inch overall length. The 35-degree right-hand helical flute geometry promotes efficient chip evacuation and reduces built-up edge when cutting aluminum. The bright, uncoated finish is suited for applications where coating interaction with aluminum is a concern. Licensed machinists and CNC operators in job shops, aerospace fabrication, and general manufacturing regularly specify this geometry for finish milling and slotting aluminum workpieces.

This end mill is part of the HELICAL SOLUTIONS End Mills for Aluminum - 3 Flute - Square - 35 Degree Helix series. It is configured for right-hand cutting with a straight-cylindrical shank, making it compatible with standard ER collet chucks and side-lock holders that accept a 5/16-inch shank. The centercutting design allows for plunge entry, expanding its utility in pocketing and full-slot operations on CNC machining centers and manual knee mills.

Key Features

• 5/16-inch (0.3125-inch) cutting diameter with matching 5/16-inch straight-cylindrical shank
• 3-flute, 35-degree right-hand helix optimized for aluminum chip evacuation
• Centercutting geometry allows direct plunge entry for pocketing operations
• Solid carbide construction for rigidity and wear resistance in non-ferrous cutting
• Bright/uncoated finish — no coating buildup risk when machining aluminum
• Standard 2-1/2-inch overall length suits most general-purpose reach requirements

Compatibility

Designed as a direct-fit replacement for 5/16-inch square end mills in ER collet chucks, milling chucks, and side-lock tool holders with a 5/16-inch bore. Intended for aluminum and non-ferrous milling applications on CNC machining centers and manual vertical mills.

Installation Notes

Installation is performed by a machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Clean the collet bore and shank of debris before seating; torque the collet nut to the tool holder manufacturer's specification. Verify runout with a dial indicator after installation and before beginning a cut.