Osg 1662500017 Thread Mill 1/4-20 Unc 4 Flute Solid Carbide

Product Description

The OSG 1662500017 is a helical flute thread mill designed for cutting 1/4-20 UNC threads in both internal and external applications. Built from solid carbide and finished with an EgiAs coating, this tool delivers hardness and wear resistance suited for production threading operations. It features 4 right-hand flutes and a cutting diameter of 0.179 inches, with a length of cut of 0.6 inches. The 1/4-inch shank diameter fits standard collet chucks on CNC machining centers. This tool is installed and operated by machinists and CNC programmers working in metal fabrication, aerospace, automotive, and general manufacturing environments.

This thread mill is appropriate for shops requiring a single tool capable of producing 1/4-20 UNC threads across a range of bore sizes in a CNC milling environment. The helical flute geometry allows progressive thread engagement, reducing cutting forces compared to single-point threading or tap-and-die methods. It is suited for use in ferrous and non-ferrous metals where consistent thread form and tool life are priorities. Coolant-through capability is not included, so adequate flood or mist coolant should be directed externally to the cutting zone.

Key Features

• Cuts 1/4-20 UNC threads in both internal and external configurations with a single tool
• Solid carbide construction provides rigidity and thermal resistance in demanding materials
• EgiAs coating reduces friction and extends tool life in steel and aluminum applications
• 4 right-hand helical flutes with right-hand thread direction for standard CNC thread milling cycles
• 0.179-inch cutting diameter and 0.6-inch length of cut for precise thread depth control
• 1/4-inch shank diameter for compatibility with standard ER and TG collet systems

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for thread milling 1/4-20 UNC threads in internal and external applications.

Installation Notes

Installation and operation should be performed by a qualified machinist or CNC programmer. Secure the shank fully into a matched collet or tool holder and verify runout before cutting. Program the tool path using a helical interpolation cycle appropriate to the machine control. Do not exceed the recommended axial depth of cut for the material being threaded, and ensure the spindle and feed rates are set per the tool manufacturer guidance for the specific workpiece material.