Osg 5954200 Tapered End Mill 3 Flute Cobalt Square End

Product Description

The OSG 5954200 is a cobalt tapered end mill designed for precision milling operations where a controlled taper profile is required. Built from M42 cobalt high-speed steel, this tool offers improved heat and wear resistance compared to standard HSS end mills, making it well-suited for harder workpiece materials. It features a 5-degree taper per side, a small end diameter of 1/8 inch, and a 3/4-inch length of cut. The uncoated finish is standard for cobalt-grade tooling intended for re-sharpening. Three right-hand spiral flutes with a 25-degree helix angle support efficient chip evacuation during cuts. This end mill belongs to OSG Series 595.

This tapered end mill is used in CNC and manual milling applications where draft angles, tapered walls, or angled cavity profiles are required. It is suitable for die and mold work, aerospace component machining, and general precision machining shops. The centercutting geometry allows plunge entry into the workpiece when needed. With a 3/8-inch straight shank and a 2-5/8-inch overall length, it fits standard end mill holders and collet chucks commonly found in vertical machining centers and knee mills.

Key Features

• M42 cobalt HSS construction for improved hardness and heat resistance over standard HSS
• 5-degree taper per side for controlled draft angle milling
• Centercutting capable for direct plunge entry
• 3 right-hand spiral flutes with 25-degree helix angle for efficient chip removal
• Uncoated finish suitable for re-sharpening and use in a wide range of materials
• Square end geometry for flat-bottomed cuts and shoulder milling

Compatibility

Designed for use with standard 3/8-inch end mill holders, collet chucks, and milling machine spindles accepting straight-shank tooling. No specific machine model compatibility was provided by the manufacturer for this part number.

Installation Notes

This tool should be installed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and machine power is off before mounting or removing the end mill from the holder. Use a properly sized collet or end mill holder and torque to the holder manufacturer's specification. Confirm runout with a dial indicator before beginning production cuts, as excessive runout will accelerate edge wear on cobalt tooling.