1. ASTM A453/A453M-2017 "Standard Specification for High-Temperature Bolting Materials with Expansion Coefficients Similar to Austenitic Stainless Steel" series fasteners. Grades: Gr.660A, 660B, 660C, 660D.

2. ASTM A193/A193M B8 , B8M.

3. Selected materials: AISI304/UNS S30400; AISI316/UNS S31600.

4. Applicable to: high and medium pressure valves; marine, shipbuilding, chemical, fluid engineering; pressure vessels; petrochemical equipment and other high temperature and high pressure equipment.

5. Optional specifications are: M8-M64; 3/8"-4".

6. The dimensions are as follows: studs: GB/T897, GB/T898, GB/T899, GB/T900, GB/T901, GB/T9125 (full thread), HG/T20634 (full thread), HG/T20613 (full thread), JB/T4707 (equal length double head), SH/T3404, NB/T47027 (A, B, C type), DIN938, DIN939, IFI136, ASME B18.31.1M (metric), ASME B18.31.2 (inch), non-standard double head according to the drawing, etc. There are A type, B type, full thread.

7. Surface treatment: natural color, Xylan coating (1052, 1070/1424, 1425), etc.