When we use to fix some objects, in order to enhance the overall firmness, we mostly use countersunk bracket bolts. This is a general designation. The types and types of countersunk bracket bolts used according to different use requirements can be said to be diversified, but even the best products will fail during use. Do you know the failure forms and causes of countersunk bracket bolts?  As a professional Bolt Factory, follow Haiyan yihui hardware technology co., ltd. to learn more about this specific knowledge.

1) assembly twist and pull fracture

Tensile fracture is characterized by significant necking and elongation at the fracture site.  The common reason is that the friction coefficient of the joint surface is too small.  The torque applied during tightening or pre-tightening is too small, the sleeve and thread are never coaxial when torque is applied, the speed is so slow when torque is applied, the performance strength of the part itself is enough and the perpendicularity of the fastening surface and the thread center line is out of tolerance.

2) thread is broken by shearing force

The fracture site twisted by shearing force usually has spiral shape without significant necking. The common reason for thread twisting by shearing force is that the thread is stuck during screwing, for example, the thread is deformed, the tooth patterns connected with each other are by no means the same, and the thread has welding slag lamp.  The section into which the bolt is screwed is resisted, for example, the nut has enough depth as the precise groove of the blind hole.

The above only introduces two situations for everyone, but in order to better use the premise is to ensure the quality of Countersunk Carriage Bolt, so many manufacturers on the market, we must polish our eyes when purchasing, so that the quality of countersunk bracket bolts will not affect our use, coupled with the correct use and maintenance methods, will give full play to the role.