Osg 4909800 Square End Mill 3/8 Inch 4 Flute Cobalt

Product Description

The OSG 4909800 is a cobalt square end mill designed for general-purpose milling operations in machine shops and manufacturing environments. Built to long-series dimensions, it features a 3/8 inch cutting diameter, a 1-1/2 inch length of cut, and a 3-1/4 inch overall length with a matching 3/8 inch shank diameter. The four-flute geometry and 30-degree helix angle work together to deliver smooth chip evacuation and stable cutting action in ferrous and non-ferrous materials. The uncoated cobalt construction provides good heat resistance and toughness in tough-to-machine alloys. This tool is used by machinists and CNC operators running vertical machining centers, knee mills, and manual milling machines.

This end mill suits slotting, peripheral milling, and profiling operations in a wide range of shop environments including job shops, toolrooms, and production floors. The coarse pitch, right-hand cut, and right-hand flute configuration make it compatible with standard spindle setups. The long-series length extends reach into pockets and deep features where standard-length end mills cannot access. It is sold as a single unit and is appropriate for both production runs and one-off toolroom work.

Key Features

• Cobalt construction provides elevated heat resistance compared to standard high-speed steel
• Four flutes with 30-degree helix angle for smooth chip flow and stable cutting
• Long-series overall length of 3-1/4 inches for extended reach applications
• Uncoated finish suitable for use with cutting fluids in a variety of work materials
• Right-hand cut and right-hand flute for standard spindle compatibility
• Coarse pitch designation for general-purpose slotting and profiling

Compatibility

Designed as an OEM-style replacement or direct tooling selection for standard 3/8 inch collet or end mill holder setups on vertical machining centers, knee mills, and manual milling machines requiring a long-series cobalt square end mill.

Installation Notes

Installation is performed by a machinist or CNC operator using an appropriate 3/8 inch end mill holder or ER collet system. Ensure the spindle is fully stopped and locked out before inserting or removing the tool. Confirm runout with a dial indicator before starting a production cut to prevent premature tool wear. Follow machine tool manufacturer torque specifications for drawbar and collet nut tightening.