Osg 5820900 Square End Mill 0.4331 in 2 Flute Cobalt

Product Description

The OSG 5820900 is a cobalt square end mill engineered for precision milling in demanding shop environments. Built from M42 cobalt high-speed steel, this double-end tool delivers consistent cutting performance on alloy steels, stainless steels, and other tough workpiece materials. The 0.4331-inch (11.00 mm) cutting diameter pairs with a 30-degree spiral helix and two right-hand flutes to produce efficient chip evacuation and smooth surface finishes. The uncoated finish suits applications where re-sharpening or specific coating compatibility is required. This tool is installed by machinists and toolroom technicians on vertical machining centers, knee mills, and CNC milling equipment.

This end mill is suited for slot milling, peripheral milling, and plunge cutting in ferrous and non-ferrous materials. Its centercutting geometry allows direct plunge entry without a pre-drilled hole. The regular-length profile fits standard tool holders for general-purpose work across job shops, maintenance machining, and production environments. The double-end design extends tool life by providing a second usable cutting end before the tool is retired or resharpened.

Key Features

• M42 cobalt construction for heat resistance and edge retention in hard materials
• Double-end design provides two cutting ends per tool
• Centercutting geometry allows direct plunge entry
• 30-degree helix angle promotes smooth chip flow and reduced cutting forces
• Right-hand cut and right-hand flute for standard milling spindle operation
• Spiral flute design for consistent chip evacuation

Compatibility

Designed as an OEM-style replacement and standard-stock cutting tool for use in any milling machine or machining center accepting a 1/2-inch shank end mill holder, collet chuck, or side-lock holder.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Seat the 0.5000-inch shank fully into the holder to the recommended gauge-line depth and torque the retention mechanism per the tool holder manufacturer specifications. Inspect the cutting edges for chips or damage before each use.