Osg 1662500617 Thread Mill 3/8-16 Unc 4 Flute Solid Carbide

Product Description

The OSG 1662500617 is a solid carbide helical flute thread mill designed for cutting 3/8-16 UNC threads in both internal and external applications. With a 0.264-inch cutting diameter, a 0.313-inch shank diameter, and a 0.875-inch length of cut, this tool handles full-thread-profile milling in a single helical pass. The 4-flute, right-hand configuration paired with an EgiAs coating provides wear resistance and helps maintain cutting edge integrity in ferrous and non-ferrous materials. Machinists and tool-and-die professionals use this tool in CNC machining centers where thread milling is preferred over tapping for precision, tool-life, or accessibility reasons.

This thread mill is suited for job shops, production machining, and maintenance environments where 3/8-16 UNC threaded features are common. Its solid carbide construction makes it appropriate for hardened materials and applications where tap breakage is a concern. The helical flute geometry supports chip evacuation during the milling cycle. It is sold and packaged as a single unit.

Key Features

• Cuts 3/8-16 UNC threads — internal and external — in a single helical interpolation pass
• 4 right-hand flutes for balanced cutting and improved surface finish
• EgiAs coating for enhanced wear resistance and tool life
• Solid carbide construction for rigidity and performance in harder workpiece materials
• 0.313-inch shank diameter for standard collet and end mill holder compatibility
• No coolant-through requirement — external coolant application is standard

Compatibility

Designed for use in CNC machining centers capable of helical interpolation; accepts a 0.313-inch shank in a standard collet or end mill holder and is intended for producing 3/8-16 UNC thread profiles.

Installation Notes

Thread milling requires a CNC control capable of helical interpolation — confirm machine compatibility before use. Secure the shank in a precision collet or end mill holder to minimize runout, which directly affects thread quality and tool life. Follow the tool manufacturer recommended speeds, feeds, and interpolation radius for the 3/8-16 UNC profile. Inspect the cutting edges before use; carbide tools should not be run if chipping is present.