Accupro 312090 Square End Mill 1/4 in 5 Flute Carbide

Product Description

The ACCUPRO 312090 is a solid carbide square end mill designed for high-performance material removal in CNC and manual milling operations. With a 1/4-inch diameter and a 5-flute spiral configuration, it delivers smooth chip evacuation and a fine surface finish in a single pass. The 38-degree helix angle promotes aggressive cutting action while managing heat buildup, and the AlTiCrN coating adds surface hardness and oxidation resistance for extended tool life in demanding cuts. The single-end, right-hand cutting geometry suits conventional and climb milling setups. This tool is installed and operated by machinists and tool-and-die professionals working with CNC machining centers and manual knee mills.

The 312090 is suited for milling ferrous and non-ferrous workpiece materials where a compact-diameter end mill is required. The 3/8-inch length of cut (LOC) keeps the tool rigid in shallow-depth applications, while the 1.125-inch reach length provides clearance for shoulder and slot work without excessive overhang. The variable index flute spacing helps suppress chatter and harmonic vibration during high-speed cuts. The micrograin carbide substrate supports both high-speed steel replacement applications and dedicated carbide-optimized tool paths.

Key Features

• AlTiCrN coating provides oxidation resistance and extends tool life in high-temperature cutting environments
• 5-flute spiral design improves chip evacuation and surface finish versus 4-flute geometry
• 38-degree helix angle supports aggressive feed rates while managing cutting forces
• Variable index flute spacing reduces chatter and harmonic vibration
• Micrograin solid carbide substrate delivers hardness and edge retention
• Center-cutting capability allows direct plunge entry into the workpiece

Compatibility

Designed as a direct-fit replacement or new-install solid carbide square end mill for 1/4-inch collet and end mill holders used in CNC machining centers, manual knee mills, and high-speed spindle setups requiring a 1/4-inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's toolholding torque and runout specifications. Always power down and lock out the spindle before changing tooling. Verify collet condition and holder cleanliness before seating the shank to the recommended gauge-line depth. Confirm cutting direction is set to right-hand before initiating a tool path.