Q: I’m in need of hex head bolts for a gas turbine hot section application. These bolts would need good strength and min. temperature tolerance of 1000 degF. Any suggestions?
A: A286 bolts are an option, but would be on the lower end of these materials in terms of temperature stability. If you wanted a bit more safety margin in the temperature range, you could consider Inconel 625. Finally if you need the ultimate in strength at high temperature you could consider Inconel 718 or Waspaloy. Inconel 718 bolts offer ultimate tensile strength of 210 ksi and Waspaloy bolts 193 ksi. Both are commonly used in gas turbine applications.
You could see a comparative list of high temperature fasteners at https://www.specialfastenersbolt.com/