Abstract: Links in industrial chains are connected by pins in bushings. Internal sealing rings in internal annular grooves near ends of bushings prevent inward movement of debris and outward movement of grease past the grooves. Steel internal sealing rings are expanded further into the grooves upon insertion of the pins through the bushings and the steel rings. The steel rings tightly grip the pins and rotate with the pins. Opposite ends of the bushings extend slightly from inside sidebars. Outer conical nitrile seals have collars placed on extended ends of the bushings and have large radiused ends for contacting inner surfaces of outside sidebars that hold the pins.

Abstract: Links in industrial chains are connected by pins in bushings. Internal sealing rings in internal annular grooves near ends of bushings prevent inward movement of debris and outward movement of grease past the grooves. Steel internal sealing rings are expanded further into the grooves upon insertion of the pins through the bushings and the steel rings. The steel rings tightly grip the pins and rotate with the pins. Opposite ends of the bushings extend slightly from inside sidebars. Outer conical nitrile seals have collars placed on extended ends of the bushings and have large radiused ends for contacting inner surfaces of outside sidebars that hold the pins.