Osg 5311500 Square End Mill 3/4 in 3 Flute Cobalt

Product Description

The OSG 5311500 is a square end mill designed for general-purpose milling operations in metal fabrication and machining environments. Built from M42 cobalt high-speed steel, it offers improved heat and wear resistance compared to standard M2 HSS tooling, making it well-suited for tougher ferrous materials. The 3/4 inch cutting diameter and 3-flute spiral geometry provide a balance of chip evacuation and surface finish. A 30-degree helix angle aids in smooth cutting action and reduced cutting forces. This end mill is center-cutting, allowing it to plunge directly into a workpiece. It is installed and operated by machinists and tool-and-die professionals on manual mills and CNC machining centers.

The 5311500 is part of OSG Series 531 and is configured as a single-end, right-hand cut, right-hand flute tool with an uncoated finish. The 1-5/8 inch length of cut and 3-5/8 inch overall length place it in the regular-length category, appropriate for standard-depth pocketing, slotting, and peripheral milling operations. The 1/2 inch shank diameter is a common size compatible with standard collets and end mill holders used in both manual and CNC setups.

Key Features

• M42 cobalt HSS construction for improved heat resistance and tool life in ferrous materials
• 3-flute spiral design balances chip clearance with surface finish quality
• 30-degree helix angle reduces cutting forces and promotes smooth chip flow
• Center-cutting geometry allows direct plunge entry without a pre-drilled hole
• Right-hand cut and right-hand flute configuration for standard spindle operation
• Uncoated finish suitable for use with cutting fluids on a wide range of materials

Compatibility

Designed as an OEM-style replacement or direct-use end mill compatible with any milling machine or machining center equipped with a 1/2 inch collet, end mill holder, or equivalent tool-holding system.

Installation Notes

Installation should be performed by a qualified machinist following standard toolroom procedures. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank to the recommended depth in the holder and torque the set screw or collet nut to the tool-holder manufacturer's specification. Verify runout with a dial indicator before beginning a cut, particularly for tight-tolerance applications.