Question: are a307 bolts stainless steel?
Answer: ASTM A307, for example, covers carbon steel bolts, studs, and threaded rod up to 60,000 PSI tensile strength. ASTM F593 covers stainless steel bolts, hex cap screws and studs. ASTM A193/A193M covers alloy steel and stainless steel bolting for high pressure or high temperature service and other special applications.