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。
bearing part name assigned by controlling agency, adjustable style designator, weight 0,304 kg; width 68mm; inner dimension 30mm special features, 47.0 inches nominal overall outside diameter