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How to choose fasteners?

Time:2017-7-14 14:36:56

Fasteners include: bolts, studs, screws, nuts, washers, pins. Locked or bitten often occurs on stainless steel, aluminum alloy and titanium alloy fasteners, these metal alloy itself has anti-corrosion properties, will be damaged in the surface, the metal surface to produce a thin layer of oxide to prevent Further corrosion. When the stainless steel fasteners are locked, the pressure and heat generated between the teeth will damage the oxide layer, so that the metal thread between the blocking or shear, and then the phenomenon of adhesion. When this phenomenon continues to occur, will make the stainless steel fasteners completely locked, no longer can not be removed or continue to lock. Usually this series of blocking _ cut _ sticky _ locked a series of actions took place in just a few seconds, so the correct understanding of the use of such fasteners, can prevent this phenomenon.

 

1. Select the product correctly

A. Before use, check whether the mechanical properties of the product meet the requirements, such as the tensile strength of the screw and the guaranteed load of the nut. The length of the screw to choose the appropriate to tighten the exposed teeth 1-2 teeth distance prevail.

B. Before use to see whether the thread is rough, whether there is iron between the thread or dirt, these things often lead to lock.

C. Before use can be done to do the lubrication of fasteners, it is recommended to use butter, molybdenum disulfide, mica, graphite or talcum powder to do the lubrication, the general use of waxing treatment to do lubrication anti-lock.

 

2. Please pay attention to the use of methods

A. Rotate the speed of the force to be appropriate, not too fast too large, as far as possible the choice of torque wrench or socket wrench, to avoid the use of movable wrench or electric wrench. Excessive speed will cause the temperature to rise rapidly and cause lock.

B. In the direction of force, the nut must be screwed in perpendicular to the axis of the screw.

C. The use of gaskets can effectively prevent overlocking problems.

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