Fastener users often reflect why stainless steel fasteners sometimes have locking problems, and similar phenomena do not occur when using carbon steel fasteners. Is stainless steel fasteners softer, carbon steel? The reason why fasteners are relatively hard? Yes! Stainless steel and carbon steel are essentially different. Stainless steel has good ductility, but its hardness has a certain gap with carbon steel. However, this statement can only be said to be half right.
Locking often occurs on fasteners made of stainless steel, aluminum alloys and titanium alloys. These metal alloys have rust resistance and produce a thin oxide layer on the metal surface when the surface is damaged. Prevent further deeper rust.
When the stainless steel fasteners are locked, the pressure and heat generated between the teeth will destroy and erase the chromium oxide layer between them, causing the metal tooth to directly block/shear, and then the adhesion occurs. When the sticking phenomenon continues (usually no more than one full caliper), the stainless steel fasteners will be completely locked and can no longer be removed or locked. Usually a series of blocking, shearing, sticking, and locking actions occur in just a few seconds. Therefore, understanding the characteristics of stainless steel products and following the correct procedures are the first steps to prevent the locking of stainless steel fasteners. step.
Many users will encounter the phenomenon that the stainless steel screws and nuts are locked during the screwing process. The reason is no more than 304 (or 316). This material has high ductility and viscosity, which can be turned from turning. Obviously in the process, experienced teachers will find that the 304/316 bar is in the process of machining, its chip discharge is extruded and wrinkled, while other materials such as brass or iron are chipped during turning. Crumb-like or silky.
If the power tool is used for quick screwing or when the stainless steel screw and the nut are subjected to a large torque, the thread contact starts to heat up, and a certain contact point is stuck to drive a large piece. As a result, the internal thread and the external thread are bonded together. When the lock is generated, the set of bolts is scrapped, and of course, the entire installed workpiece may also become a defective product.
Summarize the effective large-radius reduction or completely avoid the stainless steel screw lock in the process of installation and use. We control the thread protection in the semi-finished tooth decay and finished transport packaging (of course, even if the thread is damaged If the tooth peak is injured, it will not affect the anti-locking scheme). No matter whether you use power tools or overload torque or stainless steel screws and nylon lock nuts, they will not lock up, just like carbon steel. Users can minimize or even avoid losses without changing the installation tools and installation methods during use.
Of course, the cost of this stainless steel screw anti-locking solution is controllable and low, with little or no additional cost.
Concerned about surprises
Label: Analysis of the locking phenomenon of stainless steel fasteners
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