Stainless steel screws lock up during use and are difficult to withdraw. This kind of phenomenon is very common on stainless steel screws. The specific reason is mainly that the stainless steel material is soft. During the attack, if the speed is too high and the temperature rises, the thread will be slightly deformed and the bite will be tighter. If the time is longer, the screw and the surface of the base material will even appear "fusion" at the "micro" level, resulting in seizure.
Therefore, the correct locking method should be slow locking. The locking speed of stainless steel screws is lower than that of carbon steel screws. You can also use butter, molybdenum disulfide, graphite, mica or talc to lubricate the internal and external teeth before use to reduce the chance of locking up by reducing friction.