What are the correct standards for studs? In addition to the distinction between metric and American double studs, the production is in accordance with GB/T901, GB/T897, GB/T898, GB/T899, GB/T900 standards. This includes Type A and Type B, The distinction between isometric threads and unequal length threads. Type A refers to the toothless portion of the screw and the general diameter of the thread. Type B means that the diameter of the toothless stem is slightly smaller than the diameter of the thread. Shaped products require the user to provide design paper.
Introduction and safety of steel structural bolts Steel structural bolts are a high-strength bolt and a standard part. The fastening performance is better, and it is used for the steel structure and engineering to make the fastening effect. In general steel structure, the required steel structural bolts are all above 8.8, and there are 10.9 and 12.9, all of which are high-strength steel structural bolts. Sometimes the bolts on the steel structure do not need to be electroplated. Just OK.
Six major problems in the cleaning of fasteners in the current era After the fasteners were quenched, they were washed with a silicate cleaning agent, then rinsed, and XX solid matter appeared on the surface, and the material was analyzed by an infrared spectrometer to confirm that it was an inorganic silicate and iron oxide. This is due to the fact that the rinsing is not completely caused by the residual silicate on the surface of the fastener.