Helicoil is a new type of fastener. It' s made of SUS wire with diamond shape and high precision & strength capacities.
 

Threaded Inserts look like spring and often used in low strength and think materials or objects such as casting iron, Al, Mg and etc elements. Helical coil could improve the joint strength and anti-abrasive, at the same time, it could improve the thrust surface, flexible coupling and clear up the tolerances between the pitches and half of thread angles of the inside & outside threads.

 

CL-helicoil often as to be the repair method of broken thread hole.