Stud Manufacturer Quality Determinants
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Posted by weigao fasteners - Filed in Business - #Stud Manufacturer #China Full Threaded Stud - 13 views
Nowadays, many people have used the wrong method when purchasing China Full Threaded Stud, which has caused some problems with the quality of the eyebolts purchased by consumers. So how to distinguish the authenticity of the joint bolt?
1Look at this mark. The marking of the packing box usually has bolts. It can be divided into 8.8, 10.9 and 12.9 levels. Under normal circumstances, there is no brand on the hexagonal plane of the hexagonal bolt, which belongs to the ordinary brand, and the high-strength bolt generally has the strength indicator. For example: 8.8, but noticed that there are too many counterfeit and shoddy goods, we should also pay attention to the purchase channels and check the acceptance. 2 High-strength bolts that are not galvanized are usually black. The black outer layer is an oxide layer formed by artificial processing, which is called blackening in the industry. It is a kind of anti-oxidation protective layer formed by the corrosion of strong alkaline substances on the metal surface. There is also a process called bluing, which has the same function and principle. Therefore, high-strength bolts generally do not rust! three. Since the hexagon holes of the hexagon socket bolts generally require heat treatment before use, the general level of the hexagon socket bolts is relatively high. The material that can increase the hardness after treatment is quenched and tempered steel, which has higher mechanical strength after quenching and tempering. For quenching and tempering, general high-strength materials are not quenched and tempered at 8.8, and some Stud Manufacturer may not be quenched and tempered. When they are sold to 12.9 or 10.9 customers, the way to distinguish is to look at the sun, untempered hair is dark, and tempered hair is colored. This is the most basic common sense. 5 Simple empirical judgment: throw it on the ground and listen to the sound. The high-strength sound is crisp and brittle. The sound is strip steel. Use a saw blade and other hard tools to conduct a scratch test. The surface hardness of high-strength bolts is greater than that of ordinary bolts.