Osg 5821200 Square End Mill 0.5118 in 2 Flute Cobalt

Product Description

The OSG 5821200 is a cobalt square end mill designed for general-purpose milling operations in metalworking and machining applications. Manufactured from M42 cobalt high-speed steel, this tool delivers strong heat resistance and wear life in tough ferrous and non-ferrous materials. The cutter measures 0.5118 inches (13.00 mm) in diameter with a 1-1/8 inch length of cut and a 5/8 inch shank diameter. At 4-1/2 inches overall length, this is a regular-length tool suited for standard reach applications. The 30-degree spiral flute geometry and right-hand cut with right-hand flute make it a versatile choice for machinists running conventional or CNC milling equipment.

This end mill fits residential machine shops, industrial job shops, and toolroom environments where cobalt tooling is preferred over carbide for its toughness and regrindability. The double-end configuration provides two usable cutting ends, extending tool life per unit. With a 2-flute design, it performs well in slotting and plunging operations where chip clearance is a priority. It is uncoated and ready to run as delivered. Typical users include CNC machinists, manual mill operators, and tool and die makers working in steel, stainless, cast iron, and similar materials.

Key Features

• M42 cobalt high-speed steel construction for heat and wear resistance
• Double-end design provides two cutting ends per tool
• 2-flute spiral geometry optimized for slotting and plunge cutting
• 30-degree helix angle promotes smooth chip evacuation
• Centercutting capable — suitable for direct plunge entry
• Right-hand cut and right-hand flute for standard spindle compatibility
• Uncoated finish — compatible with regrinding and recoating services

Compatibility

Designed as an OSG Series 582 cobalt square end mill for use in standard milling machine spindles and CNC machining centers accepting a 5/8 inch straight shank.

Installation Notes

Installation should be performed by a qualified machinist. Secure the shank fully in a collet, end mill holder, or side-lock holder rated for the 5/8 inch shank diameter, ensuring adequate engagement length before tightening. Verify spindle speed and feed rates against published cobalt HSS cutting data for the workpiece material before operation. Never exceed the rated length of cut or apply side loads beyond the tool geometry limits.