Osg 5402700 Square End Mill 1 in 6 Flute Cobalt

Product Description

The OSG 5402700 is a 6-flute cobalt square end mill designed for milling operations that demand rigidity and heat resistance. Built from M42 cobalt high-speed steel, this tool handles tough ferrous materials where standard HSS tooling loses its edge. It carries a 1 inch cutting diameter with a 1.875 inch length of cut, giving machinists a solid depth range for slotting and peripheral milling in hardened and stainless steel workpieces. The uncoated finish suits applications where the base cobalt alloy alone provides adequate wear resistance. Spiral flute geometry with a 30-degree helix angle promotes chip evacuation and reduces cutting forces at the tool face.

This end mill is suited for manual mills, CNC machining centers, and knee mills running conventional or climb milling passes. The 0.625 inch reduced shank fits standard ER collet chucks and end mill holders common in job shops and production environments. Series 540 geometry targets regular-length material removal in steel, stainless steel, cast iron, and similar materials. The right-hand cut, right-hand flute configuration is the standard orientation for the majority of vertical and horizontal milling setups.

Key Features

• M42 cobalt construction for elevated hot hardness in tough ferrous materials
• 6-flute configuration increases feed rate capability and surface finish quality
• 30-degree helix angle promotes smooth chip flow and reduces axial cutting forces
• 1 inch cutting diameter with 1.875 inch length of cut covers standard slotting depths
• Reduced 0.625 inch shank accommodates common collet and end mill holder sizes
• Uncoated finish — suitable for use with cutting fluid in ferrous applications

Compatibility

Designed as a standard-shank replacement or direct-use cobalt end mill for vertical machining centers, knee mills, and CNC mills accepting 0.625 inch shank tooling in ER collets or end mill holders.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and the tool holder is clean and free of debris before seating the shank. Tighten the collet nut or set screw to the tool holder manufacturers specified torque range using the appropriate spanner or hex key. Confirm runout with a dial indicator before beginning a cut, as excessive runout accelerates tool wear and degrades surface finish.