Osg 5453100 Square End Mill 3/4 Inch 4 Flute Cobalt

Product Description

The OSG 5453100 is a 4-flute cobalt square end mill designed for milling operations in steel, stainless steel, and other ferrous materials. Built to Series 545 long-length specifications, it features a 0.75 inch mill diameter, a 3 inch length of cut, and a 5.25 inch overall length. The M42 cobalt high-speed steel construction provides elevated heat and wear resistance compared to standard HSS tooling, making it well suited for higher-feed applications where carbide is not required. The 30-degree right-hand spiral flute geometry promotes efficient chip evacuation and stable cutting action across a range of workpiece materials.

This end mill is intended for use in manual mills, knee mills, and CNC machining centers in production and job-shop environments. The long-length design extends reach into deep pockets and stepped features where standard-length tooling cannot reach. It is installed by machinists and tool-and-die professionals in metalworking applications requiring a general-purpose square end mill with extended cutting depth. The uncoated finish makes it easy to resharpen and compatible with standard HSS end mill grinding procedures.

Key Features

• M42 cobalt HSS construction for improved heat resistance over standard M2 HSS
• 4 flutes with 30-degree right-hand spiral for efficient chip evacuation
• Long-series length of cut at 3 inches for deep-pocket and extended-reach work
• Uncoated finish allows for straightforward resharpening
• Right-hand cut and right-hand flute configuration suits standard spindle rotation
• Non-centercutting design — not intended for direct plunge milling

Compatibility

Designed as an OEM-style long-series square end mill for use in standard 3/4 inch end mill holders, collet chucks, and Weldon-style tool holders on manual and CNC milling machines.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's guidelines for tool holding and runout tolerances. Power down and lock out the spindle before installing or removing the end mill. Ensure the shank is fully seated in the holder to the recommended engagement depth to prevent pullout under cutting loads. Because this is a non-centercutting end mill, use a ramping or helical entry toolpath rather than direct plunge cuts.