Osg 444-2500 Square End Mill 0.25in 4 Flute Solid Carbide

Product Description

The OSG 444-2500 is a solid carbide square end mill designed for precision milling operations in metalworking and machining applications. It features a 0.25-inch cutting diameter, a 0.625-inch length of cut, and a 3.375-inch overall length with a 0.375-inch shank diameter. Built from micrograin solid carbide, this double-end configuration delivers consistent edge integrity and extended tool life compared to high-speed steel alternatives. The 30-degree helix angle promotes efficient chip evacuation, and the uncoated finish suits applications where coating buildup tolerance or regrinding is a factor. This tool is installed and operated by machinists and CNC operators working in job shops, production facilities, and toolrooms.

This end mill is suited for slotting, profiling, and peripheral milling in ferrous and non-ferrous materials. The centercutting geometry allows plunge entry, expanding its use in pocketing and ramping operations. The spiral flute design with right-hand cut and right-hand flute direction is standard for conventional vertical machining centers and manual mills. At regular length, the 444-2500 fits standard tool holders without extended-reach adapters. It is part of the OSG Series 444 lineup, a family of general-purpose solid carbide end mills targeting versatile shop floor use.

Key Features

• 0.25-inch cutting diameter with 0.625-inch length of cut for controlled milling depth
• Micrograin solid carbide construction for improved wear resistance over standard carbide grades
• 30-degree helix angle supports efficient chip evacuation and reduced cutting forces
• Centercutting geometry enables plunge milling and ramp entry
• Double-end configuration provides two usable cutting ends per tool
• Uncoated finish — suitable for regrinding or applications where coatings are not required

Compatibility

Designed as an OEM-style replacement and general-purpose solid carbide square end mill for standard milling operations requiring a 0.375-inch shank and 0.25-inch cutting diameter.

Installation Notes

Installation and operation of this end mill should be performed by qualified machinists familiar with CNC or manual milling equipment. Ensure the machine spindle and tool holder are fully powered down and locked out before loading or removing the tool. Verify runout and concentricity of the tool holder before operation to avoid premature edge wear. Follow machine manufacturer feed and speed guidelines for carbide tooling in the workpiece material being cut.