一種圓柱形裝置,包含三個或更多個長方形球迴路,並配有一個保持器以引導球沿正確的路徑移動,專門設計用於滑動直線運動軸,以最大限度地減少摩擦和磨損。
5.9400 inches minimum and 6.0000 inches maximum overall length, f-22 raptor end item identification, straight bore shape, xr ball bushing brarings part name assigned by controlling agency, 4.5000 inches nominal outside diameter