Stud Manufacturer Prevents Lockup
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We often experience locking when assembling stainless steel bolts and stainless steel nuts. What is locked? Locking is also called seizure, which refers to the phenomenon of bolts and nuts seizing and locking during the tightening process. It usually occurs between stainless steel bolts and stainless steel nuts, so it is also called stainless steel screw locking or stainless steel screw seizing. Why do stainless steel screws lock up? Stud Manufacturer analyzes the reasons for you, as follows:
1. Excessive locking force and low thermal conductivity of stainless steel can easily lead to thread locking. The stainless steel screw nut generates heat due to friction during rotation. The thermal conductivity of stainless steel is relatively low (basically in the range of 10-30w/mc°, about 1/3 of that of carbon steel). When the generated pressure and heat destroy the chromium oxide layer, the metal tooth pattern is directly blocked/ Shearing, coupled with the softer characteristics of stainless steel, leads to adhesion. The greater the tightening force, the greater the heat generated, and the more likely the stainless steel of the screw shank part to produce adhesion.
2. The inclination angle of the thread matching and the softer characteristics of stainless steel are likely to cause locking. During the installation process, the uneven force or tilt will cause the center axis of the screw and the nut to become more tilted, and the tooth pattern will be more likely to be damaged, resulting in occlusal seizure; the hardness of the stainless steel screw is relatively soft, if it is rubbed off during the tightening process Iron filings will stick and not fall, thereby interfering with the smooth in and out of the threads, causing the bottom and top of the tooth to die.
Regarding the locking phenomenon of stainless steel screws, how to avoid the locking phenomenon? The main countermeasures are as follows:
1. Keep the center axis of the screw and nut perpendicular to the locked surface to reduce the inclination angle of the center axis of the stainless steel screw and nut.
2. Use torque wrenches or barrel wrenches as much as possible to avoid excessive force and control the torque within the torque range of the safety stock.
3. Try not to use electric wrenches, use manual wrenches to slow down the locking speed, keep the threads clean, reduce heat energy, and reduce adhesion.
4. Choose anti-locking products or use anti-locking lubricants to reduce friction and avoid locking.
5. Choose Full Threaded Stud and nuts of different materials to use together to avoid adhesion of the same material.