Corrosion of threaded fastener materials is an issue on multiple combat and combat support vehicles used by the US Marine Corps. Newly protective coatings applied to fastener materials have been recently developed for corrosion mitigation, lubricity, and consistent torque-tension as well as for reduction of environmental problems and health risks associated with the use of fasteners made of conventional electroplated cadmium coatings. However, when the protective paint systems are compromised, galvanic corrosion between the fastener and the surrounding component is likely in environments with high relative humidity or in the presence of salt spray. Testing of novel fastener materials was conducted to determine compatibility with structural materials such as aluminum and steel. Electrochemical tests were used to monitor the corrosion rates and to identify material compatibility. Cyclic salt spray testing was also used to determine the effects of environmental exposure on the functionality of the fastener systems.