Osg 5815200 Square End Mill 0.9843 in 4 Flute Cobalt

Product Description

The OSG 5815200 is a cobalt square end mill designed for material removal in milling operations across a range of metalworking applications. With a 0.9843-inch cutting diameter and a 2-inch length of cut, it handles slotting, profiling, and peripheral milling where tool rigidity and edge retention matter. The 1-inch shank diameter provides solid tool holder engagement, and the 4-flute spiral configuration supports efficient chip evacuation at moderate feed rates. Built from M42 cobalt high-speed steel, this end mill offers better heat and wear resistance than standard M2 HSS tooling, making it well suited for harder ferrous materials and interrupted cuts.

This end mill fits standard milling operations in job shops, tool rooms, and production environments. It is appropriate for use on manual knee mills and CNC machining centers where a 1-inch shank toolholder or collet system is in use. The 4-1/2-inch overall length suits standard reach requirements without the deflection risk associated with extended-reach tooling. It is not centercutting, so it is not designed for plunge entry. Right-hand cut and right-hand flute geometry follow conventional milling configurations used across most ferrous and non-ferrous applications.

Key Features

• M42 cobalt construction for improved heat resistance and tool life over standard HSS
• 0.9843-inch cutting diameter with 2-inch length of cut for deep slotting and profiling
• 4-flute spiral design supports balanced chip load and surface finish
• 30-degree helix angle promotes smooth cutting action and reduced chatter
• 1-inch shank diameter for secure clamping in standard end mill holders or collets
• Right-hand cut, right-hand flute — standard geometry for conventional and climb milling

Compatibility

Designed for use in standard 1-inch end mill holders, collet chucks, or shrink-fit toolholders on manual or CNC milling equipment. Not centercutting; not suitable for direct plunge milling operations.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and locked out before installing or removing the end mill. Seat the shank to the full recommended insertion depth in the toolholder and torque retention screws per the toolholder manufacturer specifications. Inspect cutting edges for chips or damage before each use, and verify runout with a dial indicator after setup to confirm proper seating.