Also known as O-ring belts or endless belts, closed round belts come in premeasured lengths and are ready to be installed on compatible drive systems. These seamless belts do not need to be welded or joined with connectors, which eliminates the risk of premature belt failure due to improper joining. They are commonly used on serpentine drives, line shaft conveyors, and commercial sewing machines.
Round belts can be used on V- or round-belt pulleys. When matching a belt to a pulley, make sure the diameter of the belt is compatible with the pulley. Also note that the belt will need to be stretched approximately 10 percent to its final length.