Allied Electronics Corporation offers Circular Threaded Coupling Connectors. Allied Electronics Corporation is an ISO 9001: 2000 certified company. The Circular Threaded Coupling Connectors of MS Range are made of aluminum alloy. These come in olive green in color, having corrosion resistant, cadmium plating for extreme operating conditions. The insulator is made of a specially developed Polychloroprene [Neoprene]. This gives a high degree of insulation resistance and dielectric strength, along with resilience to withstand shock, impact, and vibration.