Q: I’m looking for bolts/nuts material able to withstand to cycling temperature changes from 20 Celsius up to 600 Celsius. Strength is also important . Looking for something with tensile strength at least 800 Mpa. The application is diesel engine exhaust manifold.
Looking at your web site not sure Inconel is the right choice, but I’m not sure. Can you please advice.

A: You are probably better of with A286 material. A286 bolts (alloy 660) provide high strength temperature resistance to 1300°F (700°C). This alloy also will work well on an exhaust as they are known for their creep and oxidation resistance. Inconel bolts will also work but may be overkill.

Q:  Looking for bolts that will be used for large Diesel engine exhaust compensators in a power plant. The normal operating temp of the exhaust is 700 degrees F at full load. Loads do fluctuate often and engines experience downtime. The exhaust system does experience extreme force and vibration. Any suggestions?

A:  It sounds like a safe bet would be A286 bolts. This material is geared for high temperature exhaust streams and will do well in this kind of environment. A286 is an age hardened material that can retain its strength to 1300°F. They also offer oxidation resistance to 1500°F . A286 fasteners offer 130ksi UTS and of 85ksi yield strength.