Osg 5810100 Square End Mill 0.1181 in 4 Flute Cobalt

Product Description

The OSG 5810100 is a cobalt square end mill designed for milling operations requiring tight tolerances and consistent performance in ferrous and non-ferrous materials. The cutting diameter measures 0.1181 inches (3.00 mm), making it well suited for fine slot milling, profiling, and contouring in precision machining environments. Built from M42 cobalt high-speed steel, this end mill offers improved heat and wear resistance compared to standard M2 HSS tooling. It features 4 flutes with a 30-degree right-hand spiral helix and is configured as a single-end, uncoated tool. Machinists and tool-and-die professionals working on CNC mills or manual knee mills will find this a reliable general-purpose cutting tool for production and maintenance work.

The OSG 5810100 is intended for use in machine shop environments where small-diameter end milling is required. With a 3/8-inch length of cut (LOC) and a 3/8-inch shank diameter, this tool is compatible with standard ER collet chucks, end mill holders, and Weldon-style holders commonly found in both CNC and manual milling setups. The 2-5/16-inch overall length (OAL) positions it as a regular-length tool appropriate for general-depth applications without extended-reach requirements. Non-centercutting geometry means this tool is intended for side milling and slotting, not plunge cutting.

Key Features

• M42 cobalt construction for elevated heat resistance and tool life in harder workpiece materials
• 0.1181-inch (3.00 mm) cutting diameter for fine-tolerance slot and profile milling
• 4-flute design provides a balance of chip clearance and surface finish quality
• 30-degree right-hand spiral helix promotes smooth cutting action and efficient chip evacuation
• Uncoated finish allows for regrinding and re-use without coating delamination concerns
• Regular-length geometry (2-5/16 inches OAL) suited for standard-depth milling without deflection risk

Compatibility

Designed as an OEM-style cutting tool compatible with standard 3/8-inch end mill holders, ER collet chucks, and Weldon-style tool holders used in CNC machining centers and manual milling machines. Part of the OSG Series 581 cobalt end mill line.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine powered down and spindle locked. Confirm holder bore size matches the 3/8-inch shank diameter before mounting. This tool is not centercutting and should not be used for direct plunge entry into solid material. Follow applicable shop safety protocols and machine manufacturer guidelines for proper tool runout and clamping torque specifications.