Osg 5311100 Square End Mill 0.5 in 3 Flute Cobalt

Product Description

The OSG 5311100 is a square end mill designed for general-purpose milling in metalworking and machining applications. Built from cobalt (M42 grade), it delivers improved heat and wear resistance compared to standard high-speed steel tooling. The 0.5-inch cutting diameter pairs with a 1.25-inch length of cut, a 0.5-inch shank diameter, and a 3.25-inch overall length. Three spiral flutes with a 30-degree helix angle promote efficient chip evacuation and smooth cutting action. This is a centercutting, uncoated tool suitable for plunge and peripheral milling. Machinists and CNC operators in job shops, production facilities, and maintenance environments are the primary installers and users.

The OSG 5311100 is applied in milling operations on ferrous and non-ferrous metals where cobalt tooling is preferred for its toughness at elevated temperatures. The regular-length geometry fits standard toolholders and collet chucks commonly found on vertical machining centers and manual knee mills. It is well-suited for slotting, profiling, and face milling tasks in low-to-moderate volume production runs. No extended reach is required for typical shallow-pocket and contour work within its length-of-cut range.

Key Features

• Cobalt M42 material grade for enhanced heat resistance and tool life over standard HSS
• Three flutes with 30-degree helix angle for balanced chip evacuation and surface finish
• Centercutting design allows direct plunge entry into workpiece material
• Right-hand cut and right-hand flute configuration for standard spindle operation
• Uncoated finish suitable for use with conventional cutting fluids
• Regular-length geometry fits standard collet chucks and end mill holders

Compatibility

Designed as an OEM-style replacement or direct-fit tool for standard 0.5-inch shank end mill holders, collet chucks, and hydraulic toolholders used on vertical machining centers and manual mills.

Installation Notes

Installation is performed by machinists using a suitable end mill holder or collet chuck sized for a 0.5-inch shank. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Verify tool runout with a dial indicator after seating the shank to minimize premature wear. Follow machine tool manufacturer torque specifications for set screws or collet nuts.