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。
mil-6085a mil spec single material response lubrication material document and classification, rigid alignment type, 0.1571 inches minimum and 0.1575 inches maximum overall outside diameter, straight bore shape, 0.1950 inches minimum and 0.1990 inches maximum overall length