Osg HP421-0781 Square End Mill 5/64 in 2 Flute Solid Carbide

Product Description

The OSG HP421-0781 is a solid carbide square end mill designed for precision milling in demanding machining environments. With a 5/64 inch (0.0781 inch) cutting diameter and a 1/4 inch length of cut, this tool handles slotting, profiling, and peripheral milling operations in tight geometries. The 35-degree helix spiral flute geometry promotes efficient chip evacuation and reduces cutting forces. A TiAlN coating provides thermal resistance and extended tool life in ferrous and high-temperature alloy applications. Machinists and CNC operators working with close-tolerance features will find the micrograin carbide substrate and right-hand cut configuration well suited to their requirements.

This end mill is intended for use in CNC machining centers and manual mills where small-diameter tooling is required. Its 1/8 inch shank diameter fits standard collets and tool holders used in production and toolroom environments. The centercutting design allows for direct plunge entry into the workpiece, making it suitable for drilling start points and ramping operations. The 1-1/2 inch overall length keeps the tool rigid in setups where deflection must be minimized at small diameters.

Key Features

• 5/64 inch (0.0781 inch) cutting diameter for small-feature milling
• Solid micrograin carbide substrate for rigidity and wear resistance
• TiAlN finish for thermal protection in ferrous and high-alloy materials
• 35-degree helix spiral flute for efficient chip evacuation
• Centercutting geometry allows direct plunge entry
• Right-hand cut and right-hand flute configuration

Compatibility

Designed as an OSG Series HP421 small-diameter square end mill for use in standard 1/8 inch collets and tool holders on CNC machining centers and manual milling machines.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the spindle is fully stopped and the machine is in a safe state before changing tooling. Seat the shank fully in the collet or tool holder and torque the retention mechanism to machine manufacturer specifications. At 0.0781 inch diameter, avoid excessive overhang beyond the stated length of cut to minimize deflection and tool breakage risk.