Osg 82010321 Square End Mill 5/16 in 4 Flute Solid Carbide

Product Description

The OSG 82010321 is a solid carbide square end mill designed for precision milling operations in metal and engineered materials. Built to Series 8201 specifications, it features a 0.3125 inch (5/16 inch) cutting diameter, a 1.25 inch length of cut, and a 3.5 inch overall length, placing it in the long-series category for extended-reach applications. The four-flute, straight-flute geometry with right-hand cut and right-hand flute direction suits general-purpose profiling, slotting, and peripheral milling. The Duarise coating combined with micrograin carbide substrate supports extended tool life in demanding cutting conditions. This end mill is center-cutting, allowing plunge entry without a pre-drilled pilot hole.

The OSG 82010321 is suited for CNC machining centers and manual mills running ferrous and non-ferrous workpieces where a long-reach, small-diameter end mill is required. The variable helix and variable index design help reduce chatter and harmonic vibration at higher feed rates, making it a practical choice for finishing passes as well as roughing in stable setups. Machinists and tool-and-die shops running tight-tolerance work will benefit from the close mill diameter tolerance of plus 0.0000 / minus 0.0008 inch.

Key Features

• Solid micrograin carbide construction for rigidity and wear resistance
• Duarise coating for improved surface finish and tool life
• Variable helix and variable index geometry to minimize vibration and chatter
• Center-cutting design allows direct plunge entry
• Long-series length with 1.25 inch LOC for extended-reach milling
• Right-hand cut, straight flute with close diameter tolerance of plus 0.0000 / minus 0.0008 inch

Compatibility

Designed as an OEM-style replacement or direct-application solid carbide square end mill within the OSG Series 8201 family, compatible with standard 5/16 inch collet or end mill holders on CNC and manual milling machines.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Secure the shank fully into a properly sized collet or end mill holder and torque to the machine tool manufacturer specification. Verify runout with a dial indicator before beginning cuts. Always power down the spindle and confirm it has come to a complete stop before changing or inspecting tooling.