Osg 86300709 Square End Mill 5/16 in 3 Flute Carbide Dlc

Product Description

The OSG 86300709 is a solid carbide square end mill designed for precision milling operations in metalworking and machining environments. With a 5/16 inch (0.3125 inch) mill diameter and a 15/16 inch (0.9375 inch) length of cut, this single-end tool delivers controlled material removal in ferrous and non-ferrous applications. The DLC (Diamond-Like Carbon) coating reduces friction and extends tool life in demanding cutting conditions. Three flutes with a 40-degree helix angle and right-hand cutting direction provide efficient chip evacuation and a smooth finish. Micrograin carbide construction contributes to edge retention and dimensional stability across extended run times. Licensed machinists and CNC programmers working in job shop or production environments will find this tool suited to tight-tolerance slotting, profiling, and peripheral milling operations.

This end mill is used in vertical and horizontal milling machines, CNC machining centers, and manual knee mills where a 5/16 inch shank and 2-1/2 inch overall length are compatible with the setup. The centercutting geometry allows plunge entry, adding flexibility for pocket milling and ramp-entry toolpaths. Its 40-degree helix suits medium-to-high-speed cutting strategies in steels, alloys, and hardened materials where the DLC coating provides thermal and wear resistance. This tool is a single-end design, meaning the cutting end is not reversible, and tool life is fully determined by the condition of the single working end.

Key Features

• Solid micrograin carbide construction for edge retention and rigidity
• DLC coating reduces friction and extends tool life in demanding cuts
• 40-degree helix angle promotes efficient chip evacuation and surface finish
• Centercutting geometry enables plunge entry and ramp toolpaths
• Right-hand cut and right-hand flute direction for standard spindle use
• Single-end design with matched 5/16 inch shank and mill diameter for direct collet or end mill holder clamping

Compatibility

Designed as an OEM-style solid carbide square end mill for use in milling machines and CNC machining centers accepting a 5/16 inch shank diameter.

Installation Notes

Installation is performed by a machinist or CNC tooling technician. The machine spindle must be fully stopped and the tool holder secured before inserting or removing the end mill. Use a properly sized collet or end mill holder rated for a 5/16 inch shank to ensure concentricity and minimize runout. Follow applicable shop safety procedures and machine manufacturer torque specifications for drawbar and tool holder retention.