A2-70 is a performance head marking for stainless steel bolts and screw, austenitic steel 304, cold forming, minimum tensile strength of 700MPA.

A4-80 is stainless steel fastener on behalf of the austenitic stainless steel 316 or 316L, with strength level minimum 800MPA. it can only be hardened by cold work to improve its mechanical properties and fatigue resistance.

2205, or S31803 stainless steel fastener, make by material duplex steel, it is a high quality which has excelent corrosion resistance and mechanical properties, and can mantain stable performance in a variety of harsh environments, like chemical, petroleum and offshore engineering.

904L (N08904, 1.4539), it is a super anstenitic stainless steel with low carbon,high nickel and molybdenum composition.it has good activation-passivation transformation ability. good pitting resistance in neutral chloride-containing media.

Hastelloy C276 is one of the most corrosion-resistant of modern metal materials. mainly resistant to wet chlorine, a variety of oxidizing chlorides,hydrochloric acid at low and medium temperatures have very good corrosion resistance.

Inconel 600 is a high nickel composition alloy steel, has good resistance to high temperature corrosion and oxidation,suitable for the production of oxidation-resistant parts under 1000℃ to with standard loads.

Inconel 625 has excellent corrosion and oxidation resistance, good tensile and fatigue properties, from low temperature to 980℃, and sistance to stress corrotion nder salt spray.

Incoloy 800H is resistant to many corrosive media. high nickel  and high chomium composition, better resistance to pitting and crevice corrosion cracking.