Characteristics of high strength bolts High strength bolts are made of high strength steel, or bolts that need to be applied with large preload, which can be called high strength bolts. High strength bolts are mostly used to connect bridges, rails, high pressure and ultra-high pressure equipment. The fracture of this kind of bolt is [...]
Appearance requirements for blackening of high strength bolts: 1. The appearance of blackening treatment is blue black or dark black. 2. The film crystallizes compactly and evenly, and the product has no bottom exposure, obvious color difference, whitening and other abnormal phenomena. If the blackening treatment of high strength blackened bolt is abnormal, the following [...]
The processing technology of blackened hexagon bolt is divided into three kinds: low temperature blackening, high temperature blackening and optical extinction blackening. 1. Low temperature blackening The product quality of low temperature blackening process of hexagon bolt is better than that of the same industry, the blackening film of the processed workpiece is firm, the [...]
The identification methods of high strength bolt are mainly seen in five aspects: 1. Look at the mark. Generally, there is a mark on the packing box of the bolt. It can be divided into three levels: 8.8, 10.9 and 12.9. Generally, there is no grade mark on the hexagonal plane of hexagon bolt, which [...]
Dacromet is an advanced and complete metal surface treatment technology of dacromet hexagon bolts. It has the advantages and characteristics that other surface treatment can't match. 1. Excellent corrosion resistance. In salt spray test, 1 μ m ~ 3 μ m thick rainbow colored film will be corroded in 10 hours and corroded in 200 [...]