81x Chain – High Strength Chains – Conveyor Chain for heavy-duty operations. Our 81x chains include chain sizes 81XH and 81XH/H chains. 81X/ 81XH and 81XH/H chains consist of quad staked pins and solid bushings to provide longer wear life and handle heavy loads. All chain components are heat treated to achieve greater durability and extended chain life. Used in heavy duty operations and conveying applications in severe environments.