The Helicoil 5521-18 is a complete thread repair kit designed for 1-1/8"-7 UNC threads, providing a reliable solution for restoring damaged or stripped threads in metal components. Helicoil inserts are trusted across industrial, MRO, and manufacturing applications for their durability and precision fit.
This kit includes the necessary components to install Helicoil wire thread inserts, making it ideal for maintenance professionals, machinists, and repair technicians who need a fast, dependable thread repair in the field or on the shop floor.