Linear Motion Guides– A linear guide is a machine element that utilizes bearings, which were developed for rotary motion, in order to move heavy objects easily in a straight line. There are two parts to the Linear Guide System: The Linear Block and the Linear Rail. The linear guide blocks move down the length of the linear rail along the plane it was positioned for. Also known as “linear bearings and rails,” or “linear guideways,” linear guide systems support and guide a load or mounted tool using precise, smooth linear motion.