【机械工程】套（罩）【运输】保护性外套（外壳）

outer casing

casing ring

sausage casing

ignition distributor casing, air-tight

casing of switch with a handle serving a purpose other than the actuation, lever switch

bell-weevil hanger【油气】;casing hanger【油气】

gear casing

casing O-ring