1. When using stainless steel fasteners, are nuts always locked at a fixed speed? If it is the first time to use or not familiar with stainless steel product process users, generally speaking, slowing down the speed of locking can greatly reduce the chance of locking. Because thermal energy often occurs when the lock is locked, the probability of lock-up will increase with the increase of thermal energy. In use, the speed of stainless steel fasteners should be lower than that of carbon steel fasteners.
2. Do you lubricate the screw or nut before locking? If the answer is no, butter, molybdenum disulfide, graphite, mica or talcum powder can be recommended to lubricate the internal and external threads to reduce locking. Layer treatment is also an effective way to lubricate the nut, which will be like shrinking a lubrication film between the nut and the screw.
3. Are screw and nut of the same material grade selected? If the answer is yes, it is recommended to use different grades of screw and nut, such as 304 with 316, etc., but it should be noted that the selected stainless steel grades are in line with their own requirements for rust and corrosion resistance.
In addition, when locking the flange, the most frequent case of locking occurs. If you have noticed and acted according to the above points, including the use of gaskets, nuts, nuts in diagonal order, slow sequential rotation to appropriate tightness, etc., if it is still not possible to solve, often after the lock can not be unloaded, and finally, you have to temporarily use carbon steel nuts in the pre-lock flange device. The stainless steel nut is used when the lock is finally formally unlocked to find a balance between beauty, rust resistance and non-locking.