Stainless steel fasteners are locked failure prevention methods

Fasteners in the market is usually also known as standard parts, is two or more parts (or components) fastening connection to become a see the whole of a class of mechanical parts used in the general term. It is characterized by a wide variety of specifications, performance and use of different, and standardization, serialization, generalization of a high degree. Fasteners are widely used mechanical foundation parts, the demand is great.
Steps / methods
1, the correct choice of products: before use to confirm the mechanical properties of the product to meet the use of demand, such as the tensile strength of the screws and nuts to ensure the load. The length of the screw should be selected appropriately to tighten the nut after exposure 1-2 tooth spacing shall prevail.
2, before use to see whether the threads are rough, whether there are iron filings or dirt between the threads, these things often lead to locking.
3, before use can be given to the fasteners to do lubrication: it is recommended to use butter, molybdenum disulfide, mica, graphite or talcum powder to do lubrication, at present the common use of wax impregnation treatment to do lubrication anti-locking.
4, pay attention to the use of methods:
a, screwed into the speed of force should be appropriate, not too fast and too large, as far as possible to use torque wrenches or socket wrenches, avoid the use of activity wrenches or electric wrenches. Too fast will make the temperature rise rapidly and lead to locking. Import pump valve
b, the direction of force application, the nut is screwed perpendicular to the axis of the screw.
5, the use of washers can effectively prevent the problem of locking too tight.
6, locking or biting often occurs in stainless steel, aluminum alloy and titanium alloy material fasteners, these metal alloys themselves have anti-corrosion properties, will be in the surface damage, in the metal surface to produce a thin layer of oxidation to prevent further corrosion. When the stainless steel fasteners are locked, the pressure and heat generated between the threads will destroy this oxide layer, so that the metal between the threads to block or shear, and then the phenomenon of adhesion. When this phenomenon continues to occur, the stainless steel fastener will be completely locked, can no longer be removed or continue to lock. Usually this series of blocking _ shear _ adhesion _ locking of a series of actions occur in just a few seconds, so the correct understanding of the use of such fasteners, in order to prevent this phenomenon.