Osg 5321100 Square End Mill 1/2 in 3 Flute Cobalt

Product Description

The OSG 5321100 is a cobalt double-end square end mill designed for milling operations in ferrous and non-ferrous materials. Built from M42 cobalt high-speed steel, this tool delivers heat resistance and edge retention well above standard HSS tooling. The 0.5 inch diameter cutter features 3 spiral flutes with a 30-degree helix angle, producing smooth chip evacuation and consistent surface finishes. The centercutting geometry allows direct plunge entry without a pre-drilled hole. This end mill is uncoated, right-hand cut with right-hand flute direction, and suits machinists and tool-and-die shops running manual mills, knee mills, or CNC machining centers.

This end mill is suited for general-purpose milling tasks including slotting, profiling, facing, and plunge cutting. The double-end design provides two usable cutting ends, extending tool life per unit. The 1 inch length of cut accommodates typical shallow-to-medium-depth passes in steel, stainless, cast iron, and similar materials. With a 0.5 inch shank diameter and 4.125 inch overall length, the 5321100 fits standard ER and straight-bore collet systems commonly found in production shops and maintenance machining environments.

Key Features

• M42 cobalt HSS construction for elevated heat and wear resistance
• Double-end design — two cutting ends per tool for extended usable life
• 30-degree helix spiral flute for efficient chip evacuation
• Centercutting geometry allows direct plunge milling
• Uncoated finish suitable for use with cutting fluids or neat oils
• Right-hand cut and right-hand flute, Series 532 regular length

Compatibility

Designed as an OEM-style replacement or standard tooling option for any milling machine or machining center accepting a 0.5 inch straight shank, including ER32 collet chucks, end mill holders, and straight-bore collet systems.

Installation Notes

Installation should be performed by a qualified machinist following standard toolholding procedures. Ensure the machine spindle is fully stopped and locked before inserting or removing the end mill. Seat the shank to the minimum insertion depth recommended for the holder type in use, typically at least 1 inch of shank engagement. Verify runout with a dial indicator after clamping before beginning cuts.