Why Do Stainless Steel Bolts And Nuts Seize?

According to the performance characteristics and function of fasteners, many fasteners used in the field will be made of stainless steel. The most common disadvantage of stainless steel fasteners is that bolts and nuts can not be unrolled while used. Such kind of phenomenon is called “seizing”, or “locking”. Why stainless steel bolts and nuts can appear this kind of problem? If stainless steel bolts and nuts are “seizing”, how to solve the problem? How do we do a good job of preventing to avoid the stainless steel fasteners seizing phenomenon? As a professional fastener supplier, Xinchi Fasteners Company has a deep understanding of the use of stainless steel fasteners, and we are happy to share the relevant knowledge, hope to help you.

Once the nut and bolt are locked in the process of use, then these two fasteners will be difficult to separate. Usually, bolts or nuts will be cut off to achieve disassembly, which will directly affect the speed of disassembly and reusability of fasteners. Therefore, we need to first analyze the principle of stainless steel fasteners and the causes of the formation, and then analyze to find out the most reasonable preventive measures, so as to prevent fastener bolts and nuts from seizing.

Principle of stainless steel bolt and nut locking

Stainless steel fasteners themselves are rust-resistant. When the surface is damaged, a thin layer of oxide (chromium oxide in the case of austenitic stainless steel) is produced on the metal surface to prevent further corrosion. When the stainless steel fastener is locked, the pressure and heat generated between the dentures will destroy and erase the chromium oxide layer between them, causing the metal dentures to directly block or shear, and then the phenomenon of adhesion will occur. When the adhesion phenomenon continues, the stainless steel fastener will be completely locked and cannot be removed or locked. Usually, this sequence of blocking, cutting, sticking, and locking takes place in a few seconds.

The cause of stainless steel bolt and nut locking

Through the analysis of the principle of the stainless steel fastener locking phenomenon, it can be seen that stainless steel fastener locking is caused by the pressure or heat between the dental grain destroying the oxide layer, so that the metal material directly contacts and further develop. Therefore, too much pressure or heat between the dental grain will often cause the stainless steel fastener locking phenomenon. The following reasons often cause excessive pressure or heat between the dentures, resulting in the locking phenomenon of stainless steel fasteners.

Teeth are rough or sticky with foreign matter. If there are solder joints and other metal chips sandwiched between the teeth often leads to fastener locking.

Too much-tightening force or too fast tightening speed. Too large a tightening force is easy to produce greater pressure between teeth and leads to locking. And too fast tightening speed is easy to make the temperature between the teeth rise rapidly and then seize.

The direction and Angle of the applied force are wrong. When tightening, if the fastener tightening direction is not perpendicular to the axial direction of the bolt, it is easy to cause seizing.

Anji Xinchi Fastening Piece Co., Ltd is a one-stop solution fasteners company and is the designated fastener supplier to“STAPLE”. As a trusted fastener supplier,  Xinchi Fastener Company can offer a wide range of high-quality fasteners, including tee nuts, screws, bolts, rivets, washers, etc. If you want to know more about fasteners or want to wholesale fasteners, please feel free to contact us. And then our experienced and expert service team will reply to you as soon as possible.