Osg 5400200 Square End Mill 3/16 in 4 Flute Cobalt

Product Description

The OSG 5400200 is a cobalt square end mill designed for milling operations requiring durability and heat resistance in ferrous and difficult-to-machine materials. Built from M42 cobalt high-speed steel, this tool features a 3/16-inch cutting diameter, a 1/2-inch length of cut, and a 30-degree helix angle with four right-hand spiral flutes. The 3/8-inch shank fits standard ER and straight-shank toolholders common in vertical machining centers and knee mills. It is a right-hand cut, single-end tool intended for use by machinists and tool-and-die professionals in production and job-shop environments.

This end mill is suited for slotting, profiling, and peripheral milling in steel, stainless steel, cast iron, and other ferrous alloys where cobalt tooling outperforms standard high-speed steel. The regular-length geometry and 2-3/8-inch overall length make it appropriate for close-clearance work and shallow-to-medium depth cuts. It is uncoated and ships ready to use, though it can be recoated after resharpening. Typical applications include mold work, fixture fabrication, and general machining in both manual and CNC setups.

Key Features

• M42 cobalt construction provides elevated red hardness for cutting abrasive and harder steels
• 30-degree helix angle promotes smooth chip evacuation and reduced cutting forces
• Four right-hand spiral flutes for balanced cutting and improved surface finish
• Non-centercutting design suited for peripheral and side milling rather than plunge entry
• Regular-length geometry minimizes deflection in shallow-to-medium depth applications
• Uncoated finish allows straightforward resharpening and recoating in the field

Compatibility

Designed as an OEM-style replacement or direct-fit cutting tool for standard 3/8-inch straight-shank toolholders used in CNC machining centers, knee mills, and drill presses equipped for end milling operations.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Secure the shank to the minimum recommended insertion depth in the toolholder and verify runout with a dial indicator before beginning a cut. Consult the machine tool manufacturer and OSG cutting data recommendations for appropriate speeds, feeds, and depth of cut for the workpiece material.