Why long hexagon screws broken easily?

It is generally subconsciously assumed that the reason for the easy section of the long hexagon screws must be the lack of strength. In fact, this is a more one-sided judgment, of course, we must first exclude whether it is due to the strength of the cause. Some long hexagon screws have reached the required strength, but they still break, so it is necessary to consider whether it is hydrogen embrittlement.

Generally , the strength and hardness of a long hexagon screws are in direct proportion, that is, the higher the strength, the higher the hardness, but the hardness and toughness are inversely proportional, that is, the higher the hardness, the worse the toughness. Some people may not be able to understand this relationship very well. A high strength screw does not have much elongation, and if it is subjected to too much force, it is very likely to fracture directly. It does not undergo a deformation process like an ordinary screw.

Electroplating without dehydrogenation or dehydrogenation is not thorough will also cause screw breakage, higher-grade screws, Shi Shi Tong screw manufacturers are sure to carry out complete dehydrogenation, to prevent the problem of hydrogen embrittlement caused by screw rupture.

The reason for the breakage of the long hexagon screws is that the locking torque of the screw is too large, and the locking torque can not be greater than 85% of the damage torque. Or make a R angle under the head of the screw can effectively reduce the breakage of the screw, if the root of the screw head R degrees is too small or almost no R degrees, these will also affect the breakage of the screw.

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