1. ASTM A320/A320M-2018 "Standard Specification for Alloy Steel and Stainless Steel Bolting Materials for Low Temperature" series of external threaded fastener products:

Common grades in this standard: Gr.L7, L7M, L43, 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 external dimensions of the hexagonal product can be selected to comply with: GB/T70, DIN912, DIN7991 countersunk hexagonal socket, ISO4762 international standard, ANSI/ASME B18.3 American hexagonal socket, non-standard, etc.

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