Osg 5201305 Square End Mill 5/8 in 2 Flute Cobalt Tin

Product Description

The OSG 5201305 is a 2-flute cobalt square end mill designed for milling ferrous and abrasion-resistant materials in machining center and manual mill applications. Built from M42 cobalt high-speed steel, it carries a TiN (titanium nitride) finish that extends tool life in demanding cuts. The cutter measures 0.625 inches in diameter with a 1.125-inch length of cut, a 0.500-inch shank diameter, and a 3.125-inch overall length. The 30-degree right-hand spiral flute geometry promotes chip evacuation while the centercutting design allows plunge entry. Machinists and toolroom operators working in job shops, maintenance, and production environments reach for this series when material hardness demands cobalt over standard HSS.

The OSG 5201305 suits milling operations that require slotting, profiling, and peripheral side milling in alloy steels, tool steels, stainless, and similarly tough workpiece materials. Its regular-length geometry fits standard tool holders without extended reach. Part of the OSG Series 520 lineup, it targets applications where TiN coating provides added surface hardness and lubricity compared to uncoated cobalt tooling. The right-hand cut and right-hand flute configuration matches the spindle direction of conventional vertical machining centers and knee mills.

Key Features

• M42 cobalt HSS construction for improved heat and wear resistance over standard HSS
• TiN finish adds surface hardness and reduces friction for longer tool life
• 30-degree helix right-hand spiral flute promotes efficient chip evacuation
• Centercutting design allows direct plunge cuts without a pre-drilled hole
• 2-flute configuration provides clearance for chip-heavy slotting operations
• Regular-length geometry fits standard ER, Weldon, and side-lock tool holders

Compatibility

Designed as an OEM-style replacement or standard-stock square end mill for machining centers and manual mills requiring a 0.500-inch shank, 2-flute cobalt cutter in the OSG Series 520 family.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Power down and lock out the spindle before changing tooling. Seat the 0.500-inch shank fully into the tool holder and torque the retention mechanism per the tool holder manufacturer specifications before starting the spindle. Inspect the flutes for chips or coating damage before each use; a damaged cutting edge should not be run at full feed rates.