O -shaped sealing agricultural machine chains mainly include the C2060 OR series and the C2060H OR series with the attachment chain. It is the same as the standard O -shaped sealing chain structure. The O -shaped sealing ring is installed between the external and the internal chain section The gap between loss and debris entering the chain shaft sleeve is suitable for the use environment where the wear resistance is high. The service life is more than double the chain. The product is mainly used in the full feeding rice harvest equipment.