Osg 8556322 Square End Mill 0.315 in 4 Flute Carbide

Product Description

The OSG 8556322 is a solid carbide square end mill designed for precision milling operations in metal fabrication and machining environments. With a 0.315 inch (8 mm) mill diameter and 4 flutes, this tool delivers consistent material removal and surface finish in a variety of workpiece materials. The variable helix and variable index geometry reduce harmonic vibration and chatter, which extends tool life and improves cut quality. The Duarise coating adds surface hardness and thermal resistance. This end mill is installed and operated by machinists and CNC programmers working on vertical and horizontal milling machines or machining centers.

The 8556322 is suited for slotting, profiling, and peripheral milling applications where a long-series reach is required. The straight flute design and right-hand cut make it appropriate for controlled feed operations on ferrous and non-ferrous materials where the micrograin carbide substrate provides edge stability. It is center-cutting, allowing plunge entry. Typical applications include production machining in job shops, tool and die, and aerospace component work where tight tolerances are required.

Key Features

• Solid micrograin carbide construction for edge stability and wear resistance
• Variable helix and variable index geometry reduce chatter and vibration
• Duarise coating improves thermal resistance and tool life
• Center-cutting design allows direct plunge entry
• Long-series length for extended reach applications
• Right-hand cut with straight flute configuration, Series 8207

Compatibility

Designed as an OEM-style replacement or direct-use tooling for standard straight-shank tool holders accepting an 8 mm (0.315 inch) shank diameter, compatible with ER collet chucks, end mill holders, and similar milling machine spindle interfaces.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer guidelines for tool holding and runout tolerances. Ensure the spindle is fully de-energized and locked out before changing tooling. Seat the shank fully in the collet or holder and torque the retention nut to the tool holder specification. Verify runout with a dial indicator before engaging the workpiece.