The US Coast Guard has issued Safety Alert 03-17 following a recent investigation of a ferry propulsion failure where investigators discovered evidence of falsely identified fasteners being used as part of the drive train system. Several installed bolt heads separated from their shanks and, as a result, a splined hub coupling loosened and disconnected from the reduction gear / transmission. This then overstressed the stern tube seal, allowing water to leak into the engine room. Bolt heads generally include markings that indicate grade and manufacturer. The grade is associated with a bolt’s mechanical properties and composition. In this instance one fastener was marked with a manufacturer listed on the Department of Energy’s Suspect / Counterfeit Part Headmark List and not listed in the Department of Commerce’s Fastener Quality Act Register of Active Fastener Insignias.