The A3-70 bolt fastener product is a mature product produced by Shanghai Yaluo Precision Fastener Technology Co., Ltd. for a long time. The product is widely used in nuclear power construction, nuclear power equipment, heavy machinery equipment, petrochemical equipment, pressure vessel devices, boilers, pumps and valves, pipelines, papermaking machinery, power generation equipment, etc.
A3 represents a material of 304, while 70 represents its strength of 70N/MM ^ 2.
The more common materials are A2 and A4, which are 304 and 316 materials respectively, but if the mechanical properties of the materials can be ensured.
The commonly used materials for stainless steel hexagon bolts are austenitic stainless steel SUS302, SUS304, SUS316, SUS316L, and "low nickel" 201. Only stainless steel hexagon bolts made of 201, 304, 316 and other materials are available for spot trading, while others must be produced, processed and customized according to user requirements.
Usually, bolts and nuts can be divided into three levels based on manufacturing precision: A, B, and C. A and B levels are specially made bolts and nuts, while C level is rough bolts and nuts. For connecting bolts and nuts used in steel frame structures, unless otherwise specified, they are usually rough C-grade bolts and nuts. The differences in production and processing methods at different levels are usually matched with the following production and processing methods:
1. The bolt rods of A and B grade bolts and nuts are machined by CNC, with a smooth surface layer and precise external dimensions. Their material characteristics are classified as 8.8 grade, and their manufacturing and assembly are complex, expensive, and rarely used.
2. C-grade bolts and nuts are made of unprocessed round steel, and their external dimensions are not very precise. Their material characteristic level is 4.6 or 4.8. The deformation during shear strength bonding is large, but the assembly is convenient and the production cost is low. It is often used for compressive strength bonding or secondary stability during assembly.
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