The classification of the screw wires:

 

1 ,According to the material: Stainless steel wire ,  Copper wire screw , High temperature alloy screw

 

2, According to rhe Thread system: International standard ISO "M, MJ" series screw wires,  Unified thread "UN" series screw wires,  The thread seal pipe threads

 

3, According to the function: Free-Running Inserts,  Screw Lock Inserts.

 

4, According to the surface coating without:  The screw wire without coating,  The screw wires are coating.