Osg 5202105 Square End Mill 5/8 in 2 Flute Cobalt Tin

Product Description

The OSG 5202105 is a cobalt square end mill designed for metal cutting applications in production and job-shop machining environments. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention when cutting ferrous metals, stainless steels, and tough alloys. The 2-flute geometry with a 30-degree spiral helix promotes efficient chip evacuation and smooth cutting action. A titanium nitride (TiN) coating reduces friction at the cutting edge and extends tool life in general-purpose milling. The centercutting design allows plunge entry directly into the workpiece, giving machinists more flexibility in toolpath strategy. This is a right-hand cut, right-hand flute end mill in the OSG Series 520 lineup.

This end mill is suited for vertical machining centers, manual knee mills, and CNC milling setups used in tool rooms, fabrication shops, and production machining facilities. The 0.625-inch diameter and regular-length geometry make it a go-to choice for slot milling, profiling, and peripheral cutting in medium-duty applications where cobalt tooling outperforms standard high-speed steel. Machinists working with stainless steel, alloy steel, and cast iron will find the TiN finish and M42 substrate a practical combination for extended run lengths.

Key Features

• M42 cobalt high-speed steel substrate for superior heat resistance over standard HSS
• TiN coating reduces friction and extends cutting edge life
• 30-degree helix angle promotes smooth chip flow and reduced chatter
• Centercutting capable — supports direct plunge entry
• Right-hand cut and right-hand flute configuration for standard spindle rotation
• 2-flute design suited for slot milling and applications requiring good chip clearance

Compatibility

Designed as an OEM-style replacement or direct-fit tooling option for standard 5/8-inch diameter collet chucks, end mill holders, and milling arbors used in CNC and manual milling machines.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Secure the shank fully within the holder to the recommended engagement depth and verify runout with a dial indicator before production cuts. Follow the machine manufacturer guidelines and applicable shop safety standards for tooling changes and cutting parameters.