Home > categories > Hardware > Other Fasteners > How to check the quality of fasteners
Question:

How to check the quality of fasteners

For the commonly used standard parts, for some of the quality of good or bad, how to distinguish,

Answer:

The appearance of a color, thread through the rules, type size, such as head high, diagonal, opposite, thread length and so on. Mechanical properties include tensile strength, core hardness, decarburization, carburizing, and the like.
According to the relevant standards, such as size, appearance, thread quality, surface finish, through the rules, hardness, etc., should be considered, according to the standard about.
If it is important, random to do one or two destructive pull test, their own press with a simple tooling, pay attention to safety, if their own, to the physical and chemical test units or heat treatment of the brothers can do. You can also go to the supplier to monitor the sampling of such a similar test (contract agreed).
If the hexagonal hexagonal, with your fixed wrench or torque wrench directly try the size of the accuracy, tight to see a few times to see wear resistance.
Thread: Do not have chaos, roughness standards, internal and external thread test sets of each other about. search for

Share to: