Osg 5203305 Square End Mill 1 in 2 Flute Cobalt Tin

Product Description

The OSG 5203305 is a cobalt square end mill designed for precision milling in ferrous and difficult-to-machine materials. Built from M42 cobalt high-speed steel, it delivers superior heat resistance and edge retention compared to standard HSS tooling. The 1-inch cutting diameter pairs with a 1-1/2-inch length of cut and a 30-degree helix angle to promote efficient chip evacuation and smooth cutting action. A titanium nitride (TiN) coating reduces friction and extends tool life in demanding cutting environments. This end mill is installed and run by machinists and CNC operators in job shop, production, and maintenance machining applications.

The OSG 5203305 is suited for general-purpose milling operations including slotting, profiling, and peripheral milling. The 3/4-inch shank diameter fits standard end mill holders and collet chucks. Its centercutting design allows plunge entry directly into the workpiece. The regular-length geometry and right-hand cut with right-hand flute configuration make it a straightforward fit for vertical mills, knee mills, and CNC machining centers across a range of shop environments.

Key Features

• M42 cobalt construction for elevated heat resistance and extended tool life in tough materials
• TiN coating reduces friction and improves wear resistance at the cutting edge
• 30-degree helix angle promotes efficient chip evacuation and smooth cutting action
• Centercutting design allows direct plunge milling without pre-drilling
• Right-hand cut and right-hand flute configuration for standard spindle use
• 2-flute geometry provides chip clearance in slotting and full-width cuts

Compatibility

Designed as an OEM-style replacement or direct-fit tooling selection for standard end mill holders and collet chucks accepting a 3/4-inch shank diameter. Part of the OSG Series 520 end mill line.

Installation Notes

Installation is performed by qualified machinists or CNC setup personnel. Secure the shank fully within the holder to the minimum engagement depth recommended by the toolholder manufacturer before tightening. Confirm spindle direction is set to right-hand rotation before engaging the cut. Inspect the cutting edge for wear or chipping before each use and replace tooling that shows signs of degradation to avoid workpiece damage or tool breakage.