GB Bolt
Apr 03, 2019
The national standard bolts are used for fastening in the machinery, construction and electrical industries. One end is a hexagonal head for the wrench to be fastened, and the other end is a thread. According to the different thread lengths, the thread is divided into full thread and half thread.
GB bolts are generally divided into two types: GB30 bolts and GB21 bolts. The difference is that the hexagon head of GB30 is larger than GB21. The materials are all: Q235. Grade 4.8, weak hardness, used for parts with low hardness requirements, infrequent activities, people call ordinary bolts.
