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