Osg 5316300 Square End Mill 3 Flute Cobalt 1.25 in Shank

Product Description

The OSG 5316300 is a single-end square end mill manufactured from M42 cobalt high-speed steel. It is designed for milling flat surfaces, slots, shoulders, and profiles in a wide range of ferrous and non-ferrous workpiece materials. The 1.25-inch shank diameter and 4.5-inch overall length make this a robust, full-size tool suited to knee mills, CNC machining centers, and manual bridgeport-style machines. Three right-hand flutes with a right-hand helix provide a balance of chip evacuation and cutting edge strength. The bright, uncoated finish is standard for cobalt end mills and performs well in general-purpose applications where coating is not required.

This end mill is appropriate for job shops, tool rooms, and production environments where versatile milling capability is needed. The centercutting geometry allows the tool to plunge directly into a workpiece as well as perform conventional peripheral and slot milling. M42 cobalt construction gives the tool improved heat and wear resistance compared to standard M2 high-speed steel, making it a practical choice when cutting tougher alloy steels, stainless, or hardened materials at moderate speeds. Licensed machinists and CNC operators are the primary users of this tool.

Key Features

• M42 cobalt high-speed steel construction for improved heat resistance over standard HSS
• Three flutes with right-hand cut and right-hand helix for efficient chip evacuation
• Centercutting design allows direct plunge entry without pre-drilled pilot hole
• 1.25-inch shank diameter for secure tool holding in standard R8, CAT, or end mill holders
• Bright, uncoated finish suitable for general-purpose milling across a broad material range
• Single-end configuration — full shank length available for maximum holder engagement

Compatibility

Designed as an OEM-style replacement or direct-use end mill compatible with standard end mill holders, collet chucks, and milling machine spindles accepting a 1.25-inch straight shank.

Installation Notes

This tool is installed and operated by machinists on milling machines or CNC machining centers. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Seat the shank fully in the holder and tighten to the holder manufacturer's specification before use. Inspect cutting edges for chips or wear before each setup and do not exceed the end mill's rated speeds and feeds for the workpiece material.