The Carmex Vertical Milling CMT Three Flute Insert – Threading (C251/4RDMT7) is a versatile, indexable insert designed for vertical milling applications. It excels at producing threads, grooves, chamfers and more with consistent results, making it suitable for engineers, machinists, tradespeople, and hobbyists who value reliable performance.

Built around a ground profile, this CMT threading insert delivers high precision and a smooth surface finish even when you push cutting parameters. Its solid and accurate clamping method ensures full repeatability across multiple parts, so you can count on repeatable results job after job. The same insert supports right-hand or left-hand threading, simplifying stocking and setups, and the toolholders include a weldon shank and coolant bore for practical, integrated use. Chamfer inserts are also available if you need to add finishing features in the same setup.

• Ground profile for high precision: Delivers tight tolerances and high-quality surfaces during threading and grooves, even at higher cutting parameters.
• Solid, repeatable clamping: Provides reliable workholding and full repeatability across parts and setups.
• Versatile threading and accessories: One insert handles both right- and left-hand threads, with weldon shank toolholders and coolant bore, and chamfer inserts available for streamlined setups.

This combination of precision geometry, reliable clamping, and universal threading capability helps you complete threaded, grooved, and chamfered features in fewer setups with consistent quality. By reducing tool changes and enabling standardization across jobs, it speeds up workflows and improves finish quality, giving you predictable results and greater confidence in every part you ship.