Osg 84420323 Square End Mill 0.25in 6 Flute Solid Carbide

Product Description

The OSG 84420323 is a solid carbide square end mill designed for high-performance material removal in demanding machining applications. Built to Series 8442 specifications, it features a 0.2500-inch diameter, six flutes, and a 43-degree helix angle that promotes aggressive chip evacuation and smooth cutting action. The DUROREY coating provides enhanced wear resistance and heat management at the cutting edge. This end mill is single-end, right-hand cut, with a right-hand spiral flute configuration and a straight cylindrical shank. It is intended for machinists and CNC operators working in production or job-shop environments who need reliable performance on hard and ferrous materials.

This end mill is rated for hard materials and steels, indicated by material grade code H. The long-series length configuration suits applications requiring extended reach into pockets, slots, or contours. With a 1-inch length of cut and a 2.75-inch overall length, it fits standard 0.25-inch toolholders and collet chucks used on vertical machining centers and CNC mills. Centercutting capability allows plunge entry, giving operators flexibility in toolpath programming. The ultra-fine micrograin carbide substrate supports elevated surface speeds and extended tool life compared to standard-grade carbide.

Key Features

• Six-flute design for high feed rates and improved surface finish on hard materials
• 43-degree helix angle promotes efficient chip evacuation and reduced cutting forces
• DUROREY coating for wear resistance and thermal protection
• Centercutting geometry allows direct plunge entry without a pilot hole
• Ultra-fine micrograin carbide substrate supports elevated cutting speeds
• Long-series overall length of 2.75 inches for extended-reach applications

Compatibility

Designed as a direct-fit replacement for standard 0.25-inch square end mill applications requiring a 6-flute, long-series solid carbide tool in a straight cylindrical shank configuration. Consult OSG Series 8442 documentation for approved toolholder and collet chuck pairings.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify toolholder runout and collet condition before seating the shank; excessive runout accelerates wear and can cause tool breakage. Follow the machine manufacturer and tooling supplier guidelines for clamping torque and minimum shank engagement depth.