1. ASTM A193/A193M-2019 "Alloy steel or stainless steel bolt materials for high temperature or high pressure and other special purpose equipment" series products. Common grades in this standard: Gr.B7, B7M, etc.

2. Applicable to: industrial high and medium pressure valves; marine, shipbuilding, chemical, fluid engineering; pressure vessels, pressure pipelines; petrochemical equipment; new energy, environmental protection equipment and other low temperature and high pressure environments.

3. The product dimensions can be selected in accordance with: GB/T5783, GB/T5782, SH/T3404, DIN933, DIN931, ISO4014, ISO4017, UNI5737/UNI5739 Italian standards, ASME B18.2.3.1M, ASME B18.2.3.5M, ASME B18.2.3.6M metric hexagon, ANSI/ASME B18.2.1 American standards, non-standard sizes, etc.

4.Surface treatment: natural color, phosphating, blackening, zinc plating (Zn), Dacrotized, Xylan coating.