إطار أو حاوية تفصل بين العناصر الدوارة للمحمل وتحتفظ بها، أو الأسطوانة (كما تم تعديلها).
2.4120 inches minimum and 2.4220 inches maximum outside diameter, qq-c-465,alloy 642 fed spec 1st material response or qq-c-390,alloy g6 fed spec 2nd material response overall material document and classification, 2.2090 inches minimum and 2.2120 inches maximum bore diameter, copper alloy 642 overall material, 0.4500 inches minimum and 0.4600 inches maximum overall width