一種通常呈圓形的剛性部件,用於容納軸承。它用於定位軸承,但不會包裹軸承或限制軸承的運動。
material controlled iaw ss800-ag-man-010/p-9290 system certification produres and criteria manual for deep submergence systems; critical item for safety and survival of deep submergence research and rescue vehicles as differentiated by special test features reference number differentiating characteristics, zzzy criticality code justification