Accupro 319898 Square End Mill 0.25in 3 Flute Carbide Zrn

Product Description

The ACCUPRO 319898 is a solid carbide square end mill designed for precision milling operations in metalworking and machining applications. Built from micrograin solid carbide with a ZrN (zirconium nitride) coating, this three-flute tool delivers consistent material removal with extended tool life. It features a 37-degree spiral helix angle and right-hand cut with right-hand flute direction, supporting efficient chip evacuation and reduced heat buildup at the cutting edge. The centercutting geometry allows both plunge and peripheral milling. This tool is intended for use by machinists and CNC operators in job shops, manufacturing facilities, and toolrooms.

This end mill suits a wide range of milling operations including slotting, profiling, and contouring on ferrous and non-ferrous materials. The extended reach design, with a 2.125-inch reach length, makes it suitable for deeper pockets and stepped features where standard-reach tooling cannot access. The 0.25-inch shank diameter fits standard collets and end mill holders on most vertical machining centers and manual knee mills. The ZrN coating adds surface hardness and lubricity, making it well suited for stainless steel, alloy steel, and similar work materials.

Key Features

• Micrograin solid carbide construction for rigidity and wear resistance
• ZrN coating improves surface hardness and reduces friction at the cutting edge
• 37-degree helix angle promotes smooth cutting action and efficient chip flow
• Centercutting design allows direct plunge entry into workpiece
• Extended reach of 2.125 inches accommodates deeper pockets and stepped features
• Right-hand cut and right-hand flute direction for standard CNC and manual mill setups

Compatibility

Designed as a standard 0.25-inch shank square end mill compatible with collet chucks, shrink-fit holders, and end mill holders sized for 1/4-inch shank tooling on vertical machining centers and manual milling machines.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and the control is in a safe state before changing tooling. Secure the shank to the specified minimum insertion depth recommended by the toolholder manufacturer to prevent pullout under load. Verify runout with a dial indicator after seating the tool, as excessive runout will reduce tool life and surface finish quality.