Q: I’m designing a furnace vent system for a continuous service high heat appliance (NFPA 211). The maximum furnace working temperature is 2100 deg F; design temperature is 2190 deg F. Will Alloy 330 or 310 SS bolts and nuts work for me?
A: You are at the absolute limit in terms of temperature for these fasteners for 310 or 330. (see https://www.extreme-bolt.com/