Straight joints can be used as straight-through fittings in oil and gas pipeline systems, as well as in industries such as petroleum refining, chemical, light industry, textiles, national defense, metallurgy, aviation, and shipbuilding, and in various machinery systems. The dataset includes primary raw and auxiliary materials, energy consumption, and waste generated during the production process; however, infrastructure such as production equipment and facility construction is excluded from the system boundary. The life cycle inventory is compiled from data collected from multiple sources. Production activities of straight joints include cutting, machining, surface treatment, assembly, and inspection processes.