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The difference between Gr4.8 and Gr8
The standard values of 4.8 and 8.8 are based on the characteristics of the data, the better the performance.
1. Grade 4.8 bolts are made of unprocessed round steel, and the specifications and models are not accurate enough, but the deformation is large during bending resistance, but the installation is convenient, the production and manufacturing are low-cost, and they are mostly used for tensile connection or temporary fixation during installation;
2. The shank of the 8.8-grade bolt is machined by numerical control to have a smooth surface and precise specifications and models;
3. The production and installation are complicated, the price is high, and it is rarely used.
General bolts can be divided into three grades: A, B, and C according to the manufacturing precision. Grades A and B are specially manufactured bolts, and Grade C is for random bolts. For the connecting bolts used in steel frame structures, unless otherwise specified, they are generally made of ordinary C-grade bolts. There are differences in the processing methods of different grades. Generally, the matching processing methods are as follows: ①The bolts of A and B grade bolts are processed by numerical control, with smooth surfaces, accurate specifications, and the grades of raw and auxiliary materials. It is grade 8.8, the production and installation are complicated, the price is high, and it is rarely used; 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 grade 4.6 or grade 4.8. The deformation is large during the bending connection, but the installation is convenient and the production cost is low. It is mostly used for tensile connection or temporary fixation during installation.