Osg 5821300 Square End Mill 0.5512 in 2 Flute Cobalt

Product Description

The OSG 5821300 is a cobalt square end mill designed for material removal in milling applications across a range of metals and alloys. With a 0.5512-inch cutting diameter and a 1.125-inch length of cut, this tool delivers consistent performance in roughing and finishing passes. Built from M42 cobalt high-speed steel, the 5821300 handles higher heat and hardness than standard HSS tooling. The 2-flute configuration with a 30-degree spiral helix promotes chip evacuation and smooth cutting action. Centercutting geometry allows plunge milling as well as peripheral cuts. This tool ships uncoated and is suited for machinists and tool-and-die professionals working on manual or CNC milling machines.

The OSG 5821300 is appropriate for general-purpose milling in job shops, maintenance shops, and production environments. Its regular-length profile and 0.625-inch shank diameter make it compatible with standard milling chucks, collet holders, and end mill adapters. The right-hand cut and right-hand flute orientation follow conventional milling spindle direction. With a double-end configuration, the tool offers two usable cutting ends, extending tool life between replacements. This end mill is a practical choice for slotting, profiling, and plunge cuts in ferrous and non-ferrous materials.

Key Features

• M42 cobalt construction for improved heat and wear resistance over standard HSS
• 2-flute spiral design with 30-degree helix angle for efficient chip evacuation
• Centercutting geometry supports plunge milling entry
• Double-end configuration provides two cutting ends per tool
• Right-hand cut, right-hand flute for standard spindle compatibility
• Uncoated finish suitable for use with cutting fluid or dry applications

Compatibility

Designed as an OEM-style replacement or direct-use end mill for standard milling setups using 0.625-inch shank toolholders; part of the OSG Series 582 cobalt end mill line.

Installation Notes

Installation should be performed by a qualified machinist following shop safety protocols. Ensure the milling machine spindle is fully powered down and locked out before inserting or changing tooling. Seat the shank fully in the collet or chuck to the recommended grip depth and torque the retention mechanism per the toolholder manufacturer's specifications. Verify runout with a dial indicator before initiating a cut to prevent premature tool wear or workpiece damage.