Osg 82010221 Square End Mill 5/16 in 4 Flute Solid Carbide

Product Description

The OSG 82010221 is a solid carbide square end mill designed for precision milling operations in metalworking and machining environments. Built on OSG's Series 8201, this long-series end mill features a 0.3125 inch (5/16 inch) cutting diameter, a 0.9375 inch length of cut, and a 3.5 inch overall length. The micrograin carbide substrate and Duarise coating support performance in demanding cutting conditions. With a variable helix and variable index geometry, the tool is engineered to reduce chatter and improve surface finish across a range of workpiece materials. This tool is installed and operated by machinists and CNC operators in production and job-shop settings.

The OSG 82010221 is suited for milling ferrous and non-ferrous materials in both manual and CNC machining centers. Its straight flute configuration and right-hand cut, right-hand flute orientation make it appropriate for conventional slot milling, peripheral milling, and profiling operations. The long series length provides extended reach for deeper pockets or setups where a standard-length end mill cannot access the work zone. Center-cutting capability allows it to be plunged directly into the material without pre-drilling.

Key Features

• Solid micrograin carbide construction for rigidity and wear resistance
• Duarise coating for improved tool life in challenging materials
• Variable helix and variable index geometry reduces vibration and chatter
• Center-cutting design allows direct plunge entry
• Long series overall length of 3.5 inches provides extended reach
• 4-flute configuration balances chip evacuation and surface finish

Compatibility

Designed as a direct-fit replacement or standard tooling selection for CNC machining centers and manual knee mills accepting a 0.3125 inch (5/16 inch) shank diameter in an ER or collet-style toolholder.

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and locked out before inserting or removing the end mill from the toolholder. Verify collet or chuck bore matches the 0.3125 inch shank diameter and that the tool is seated to the correct gauge length before tightening. Follow the machine manufacturer's runout and torque specifications for the toolholder in use.