Osg 5253100 Square End Mill 3/4 in 2 Flute Cobalt

Product Description

The OSG 5253100 is a cobalt square end mill designed for general-purpose milling operations in machine shop and manufacturing environments. Built from M42 cobalt high-speed steel, it delivers improved heat and wear resistance compared to standard HSS tooling, making it suitable for harder workpiece materials and higher-speed cuts. The cutter features a 3/4-inch diameter, a 2-1/4-inch length of cut, and a 4-1/2-inch overall length. The 30-degree helix spiral flute geometry promotes efficient chip evacuation, and the center-cutting design allows direct plunge entry without a pre-drilled hole. This tool is installed by machinists, toolroom technicians, and CNC setup personnel.

The OSG 5253100 belongs to the Series 525 long-length lineup, offering extended reach beyond standard-length end mills. It is suited for slotting, profiling, and peripheral milling applications where additional length of cut is required. The uncoated cobalt construction makes it a practical choice for ferrous and non-ferrous materials where re-sharpening is preferred over coated tooling. Right-hand cut and right-hand flute orientation are compatible with conventional milling machine and CNC machining center spindle configurations.

Key Features

• M42 cobalt high-speed steel construction for improved hardness and heat resistance over standard HSS
• 3/4-inch diameter with matching 3/4-inch shank for direct collet or end mill holder mounting
• 2-1/4-inch length of cut in a long-series configuration for extended reach applications
• 30-degree helix spiral flute promotes efficient chip flow and reduces cutting forces
• Center-cutting geometry enables plunge milling without a pilot hole
• Uncoated finish supports easy re-sharpening and suits shops preferring non-coated tooling

Compatibility

Designed as an OEM-style replacement or equivalent for standard 3/4-inch shank end mill holders, collet chucks, and milling machine spindles accepting 3/4-inch straight-shank tooling. No specific model compatibility data was provided in the source data.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Ensure the spindle and machine power are fully off and locked out before changing tooling. Seat the shank fully into the holder to the minimum engagement depth required for secure clamping, and verify runout with a dial indicator before committing to a cut. Follow applicable machine tool manufacturer guidelines for torque on set screws or collet nuts.