The Difference Between 4.8 Grade Bolts And 8.8 Grade Bolts

Friends who need fasteners should have been familiar with the concepts of 4.8 and 8.8. Most of them should have little contact. They only know that 8.8 bolts are better than 4.8 bolts and more expensive than 4.8 bolts, but they probably don't know what is really good and what is expensive. Recently, a customer asked Xiaorui this question, so take this opportunity to show you the difference between the two.

        First of all, it can be determined that the standard values of 4.8 and 8.8 are classified according to characteristics, and the higher the data, the better the performance.

        Like the bolts on the market, they can be divided into three grades: A, B, and C according to the manufacturing precision. Grades A and B are special bolts, and grade C is ordinary bolts.

        For the connecting bolts used in steel frame structures, unless otherwise specified, they are generally ordinary C-grade bolts.

         There are differences in the processing methods of different grades, and the corresponding processing methods are generally as follows:

         ①The bolt rods of A and B bolts are made of precision-machined steel through CNC processing, with smooth surface and precise specifications and models. The characteristic grade of raw and auxiliary materials is 8.8. It is rarely used in common use scenarios, and is mostly used in environments with harsh environments and high compressive strength.

         ② Grade C bolts are made of unprocessed round steel, the specifications and models are not accurate enough, and the characteristic grades of the raw and auxiliary materials are 4.6 or 4.8. The deformation is large during the bending resistance connection, but the installation is convenient and the manufacturing cost is low. It is mostly used for tensile connection or temporary fastening during installation;

        A brief summary is that grade 4.8 belongs to ordinary bolts, while grades 10.8 and 12.9 above grade 8.8 belong to special bolts.

        Of course, as a consumer, the higher the grade, the better. According to the existing use environment, it is best to calculate the appropriate bolts in combination with the cost. If you have any questions or want to consult, you are welcome. Feel free to add our business people below for consultation.