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。
ground surface finish, 1.2300 inches minimum and 1.2500 inches maximum overall length, 0.8750 inches minimum and 0.8755 inches maximum outside diameter, 0.5000 inches nominal working bore diameter