Thomson 500 Series Ball Linear Guides provide long life, exceptional rigidity, high dynamic and static load capacities, accommodation for high moment loads, high running accuracy, multiple sealing options and multiple lubrication inlet options. This allows for on-site field modifications and interchangeability with competitor offerings. Improved machine accuracies and rigidity; reduce vibration and extend machine and tool life. The 500 Series Ball Linear Guides are produced from high quality bearing steel. Almost all carriages, rails, and rolling elements are through-hardened. The end cap is constructed of a high strength, glass filled nylon with nitrile rubber seal.