Osg 5819300 Square End Mill 0.5709 in 4 Flute Cobalt

Product Description

The OSG 5819300 is a cobalt square end mill designed for milling operations requiring a rigid, high-heat-tolerant cutting tool. Built from M42 cobalt high-speed steel, it delivers strong performance in tough ferrous and work-hardening materials. The tool features a 0.5709-inch cutting diameter, a 1.375-inch length of cut, and a 0.5000-inch shank diameter, with a 3.375-inch overall length. The 30-degree spiral flute geometry promotes efficient chip evacuation while the four-flute configuration supports higher feed rates and improved surface finish compared to two-flute designs.

This end mill is suited for conventional milling operations in job shop, toolroom, and production environments. The right-hand cut and right-hand flute orientation are standard for use in conventional vertical and horizontal milling machines as well as CNC machining centers. Its regular-length profile and 1/2-inch shank make it compatible with standard collet chucks and end mill holders commonly found in general metalworking shops. Machinists working with alloy steels, stainless steel, and other demanding materials will find the M42 cobalt construction well suited for these applications.

Key Features

• 0.5709-inch (14.50 mm) cutting diameter with a 1.375-inch length of cut
• M42 cobalt high-speed steel construction for heat and wear resistance
• Four-flute spiral design with 30-degree helix angle for efficient chip flow
• Right-hand cut, right-hand flute orientation for standard milling setups
• Non-centercutting design — not intended for direct plunge cuts
• Uncoated finish; OSG Series 581 regular-length configuration

Compatibility

Designed as a standard OEM-style replacement or general-use square end mill compatible with 1/2-inch collet chucks, end mill holders, and milling machine spindles accepting 1/2-inch shank tooling.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine powered down and spindle fully stopped. Secure the shank in a properly sized end mill holder or collet chuck, ensuring adequate engagement depth per the toolholder manufacturer guidelines. Verify runout after installation before beginning a cut. Because this is a non-centercutting end mill, avoid direct vertical plunge entry into solid material — use ramping or helical interpolation strategies instead.