【Iron Air Hose Fitting】A 1/2-inch Iron Air Hose Fitting with threaded joints helps to secure hose connections, ensuring that they are tightened while preventing looseness and facilitating cleaner connections. 【1/2 Air Hose Fittings】Coupling Chicago Fitting use in garages, air hoses, air compressors, air tools in car garages, professional workplaces, or homes in many different places, and can be connected to any interface within this range (pay attention to size and shape when purchasing air tool accessories). 【NPT Iron Air Hose Fitting】Both protruding universal joints are equipped with two safety clips and rubber gaskets. The safety clips can be inserted into the locking holes of the joint to prevent the joint from falling off under certain pressure, causing leakage and other problems. The lock hole design is designed to better improve the safety factor. 【High Quality】1/2 "NPT external thread hose joint is made of carbon steel structure, with galvanized surface and high compressive strength, corrosion resistance, not easily damaged, long service life, and a maximum working pressure of 150PSI. 【Universal Coupling Fitting】1/2 inch nominal pipe thread (NPT), suitable for standard air hose sizes, easy to install, different from other couplings, and does not require grease or oil for sealing during assembly. The maximum recommended working pressure at an ambient temperature of 70 degrees Fahrenheit is 150 pounds per square inch. Using a universal head, any accessory within this range can be connected regardless of the size of the hose rod or thread. During use, hose components may experience accidental twisting. To eliminate the possibility of accidental disconnection, each Air King is equipped with a safety clip. This clip is designed to be inserted into the lock hole on the accessory. Using a safety clip ensures that user accessories are properly connected. Complies with the pressure requirements specified in the A-A-59553 commercial project description for Mil-Spec-WWC-633D replacement. Rubber seals. Made of iron. The head size is 2-1/2 inches. The hexagonal size is 3/8 inch. 1/2 "NPT female head.