Osg HP421-1181 Square End Mill 0.1181 in 2 Flute Carbide

Product Description

The OSG HP421-1181 is a solid carbide square end mill designed for precision milling operations in metalworking and machining applications. It features a 0.1181-inch (3.00 mm) mill diameter with a 0.3937-inch (10.00 mm) length of cut, making it well suited for small-feature work, slot milling, and profiling in tight geometries. The two-flute, 35-degree right-hand spiral design promotes efficient chip evacuation, while the TiAlN finish provides heat resistance during high-speed cutting. Micrograin carbide construction delivers rigidity and wear resistance in demanding applications. This tool is installed by machinists and CNC operators working in job shops, aerospace, mold and die, and general precision manufacturing environments.

The HP421-1181 is built for cutting operations that require high accuracy in small diameters. Its centercutting capability allows for direct plunge entry, adding versatility for interpolated holes and ramping operations. The 3.00 mm shank diameter matches the mill diameter, and the overall tool length is 39.00 mm (approximately 1.535 inches), keeping the tool compact and minimizing deflection. This series is suited for milling ferrous and non-ferrous metals where a fine surface finish and controlled tool life are priorities.

Key Features

• 0.1181-inch (3.00 mm) mill diameter for precision small-feature milling
• 2-flute spiral design with 35-degree helix for effective chip evacuation
• Centercutting geometry allows direct plunge and ramp entry
• TiAlN finish provides elevated heat resistance for extended tool life
• Micrograin solid carbide construction for rigidity and edge retention
• Right-hand cut and right-hand flute, standard CNC spindle compatible

Compatibility

Designed as an OEM-style replacement and standard tooling selection within the OSG HP421 series for CNC machining centers and manual mills accepting a 3.00 mm shank diameter collet or tool holder.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and machine in an e-stop or powered-down state. Ensure the collet or tool holder is clean and properly torqued per the machine tool manufacturer specifications before operation. Verify runout with a dial indicator after toolsetting, as small-diameter carbide end mills are sensitive to misalignment. Follow applicable shop safety standards and machine manufacturer guidelines for feeds, speeds, and coolant application.