إطار أو حاوية تفصل بين العناصر الدوارة للمحمل وتحتفظ بها، أو الأسطوانة (كما تم تعديلها).
qq-c-465,alloy 642 fed spec 1st material response or alloy 954,type 2 or 3 fed spec 2nd material response overall material document and classification, copper alloy 642 overall material, 0.4840 inches minimum and 0.4940 inches maximum overall width, 1.8190 inches minimum and 1.8220 inches maximum outside diameter, 1.5640 inches minimum and 1.5670 inches maximum bore diameter