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Coefficients of friction for zinc-cobalt and cadmium plated connectors

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I am investigating why backshells are becoming loose after being torqued on cable connectors. The connectors and backshells are mix match combinations, and are cadmium plated & zinc-cobalt plated. I have not been able to identify or find out what the coefficients of friction are for the cadmium plated and zinc-cobalt plated connectors and backshells are. Anyone can lend some help?

Mohamed Premji
General Dynamics Canada Ltd - Calgary, Alberta, Canada

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