Stainless steel screws and nuts will not be used together, why? It is likely that everyone knows that self-tapping screws do not require nuts, but stainless steel screws are used to fasten nuts with copper nuts, which is why? Shenzhen Pingood Precision Hardware Technology Co., Ltd., finds out the relative reasons according to the specific situation.
The reason why this statement appears is actually that, when the flange of the low-temperature pipeline is assembled, if it is fastened with stainless steel screws and nuts, it is very easy to bite after a period of time. This is because after screwing, the overall structure of the thread and the screw will be slightly deformed, resulting in a tighter bite; or after a long time, the screw and the screw hole will produce a "fusion" phenomenon. At this time, if you want to remove the screw and nut again, more force will be needed to overcome the frictional force of the thread connection and overcome the energy generated by the material deformation and the destruction of intermolecular polymerization. In short, it will become particularly difficult.
In order to avoid difficult disassembly, we can use the following methods.
1. The material of the nut can be replaced with a copper nut, which can avoid the fusion phenomenon.
2. Apply some grease to the screw before screwing the nut.
3. The anti-seizure agent can be used to prevent corrosion, sintering, rust and wear of parts at high temperatures.