Accupro 313909 Square End Mill 3/8 in 2 Flute Solid Carbide Zrn

Product Description

The ACCUPRO 313909 is a solid carbide square end mill designed for precision milling operations in metal-cutting environments. It features a 3/8 inch cutting diameter, a 1/2 inch length of cut, and a 4 inch overall length. The two-flute, spiral geometry runs at a 45-degree helix angle with right-hand cut and right-hand flute orientation. A zirconium nitride (ZrN) coating improves surface hardness and heat resistance, extending tool life in ferrous and non-ferrous materials. Micrograin carbide construction provides rigidity and edge retention. This end mill is centercutting, allowing direct plunge entry. It is used by machinists and tool-and-die professionals in CNC and manual milling applications.

The 313909 is suited for slotting, profiling, and pocketing operations in light to medium-duty milling setups. The 3/8 inch shank fits standard ER and end mill collet holders common in vertical machining centers and manual knee mills. With a 2-1/8 inch reach length, it handles applications requiring extended clearance from the spindle nose to the workpiece. The ZrN finish makes it a practical choice for aluminum, brass, and mild steel applications where tool life and surface finish quality are priorities.

Key Features

• Solid micrograin carbide construction for rigidity and edge retention
• ZrN coating for improved hardness and heat resistance
• 45-degree spiral helix angle for efficient chip evacuation
• Centercutting geometry allows direct plunge milling
• Right-hand cut and right-hand flute orientation for standard CNC spindles
• Extended reach design with 2-1/8 inch reach length

Compatibility

Designed as a direct-fit replacement for standard 3/8 inch shank square end mill applications using ER collet chucks or end mill holders on CNC vertical machining centers and manual milling machines.

Installation Notes

Installation and tool changes must be performed with the machine spindle fully stopped and the control in a safe, locked-out state. Ensure the collet or tool holder bore is clean and free of chips before seating the shank. Torque the collet nut or set screw to the holder manufacturer's specification using the correct spanner or hex wrench. Verify runout with a dial indicator after tool installation before beginning any cutting operation.