Stainless steel standard parts are easy to lock, so we must first find out what the locking phenomenon is? What causes the stainless steel standard parts to lock? Then analyze and deal with the causes of locking. Recently, some friends left messages to learn some relevant knowledge. Xiao Rui consulted some cases, so I will show you how to reasonably and correctly solve the locking problem of stainless steel standard parts.
1. When using stainless steel standard parts, do you always lock the nuts at a fixed speed?
If it is the first time to use or is not familiar with the process of stainless steel standard parts, you should consult your supplier about the relevant characteristics of stainless steel. Generally speaking, slowing down the locking speed can greatly reduce (or even completely avoid) the chance of locking. Because thermal energy often occurs at the time of locking, when the thermal energy increases, the probability of locking will also increase. When in use, the speed of locking stainless steel fasteners shall be lower than that of locking carbon steel.
2. Are screws or nuts lubricated before locking?
If the answer is "No", it is recommended to use butter, molybdenum disulfide, graphite, mica or talcum powder to lubricate the internal and external tooth lines to reduce the occurrence of locking. Coating is also an effective lubrication method. The nut after coating treatment will be like a layer of lubricating film between the nut and the screw.
3. Are screws and nuts of the same material grade selected?
If the answer is yes, it is recommended to use screws and nuts of different grades, such as 304 with 316, etc. However, it should be noted that the selected stainless steel grade should also meet its own rust and corrosion resistance requirements.
In addition, locking flange is the most common case. Suppose you have paid attention to and acted according to the above key points, including the use of washers, coating nuts (it is also recommended to use longer nuts, such as GB6170 or DIN934), nuts in diagonal order, slowly and sequentially screwing to the appropriate tightness, etc. If it still cannot be solved, it is often impossible to remove it after pre locking. Finally, we have to ask you to temporarily use carbon steel nuts when pre locking the flange device, and then use stainless steel nuts when finally formally locking, Find a balance between beautiful, rust resistant and non locking.
