Also known as Alloy 660, A286 bolts are a cost-effective material for high temperature  strength – see why in this snapshot newsletter.

What specifications can you offer?
A286 is available in ASTM and many AMS standards (often required for aerospace applications) including: ASTM A453, AMS 5525, AMS 5726, AMS 5732, AMS 5737, AMS 5804.

What is the maximum usable temperature of A286?

 

 

 

 

Are there better materials for high temperature strength?
A286 screws are a good cost effective solution for high temperature strength, however other high performance materials in this category may be a better fit. These  include:

 

 

 

 

 

Can you provide NAS parts in A286?
Yes.  A286 is available in many NAS aerospace parts typically in the strain-hardened condition at 160 min UTS.

Can A286 provide corrosion resistance?
In terms of corrosion, A286 bolts are best used to minimize high temperature oxidation from exhaust streams and engine manifolds.

While A286 screws are a stainless steel and will hold up well to atmospheric corrosion, it is typically not used for harsh conditions such as acids. Its chemical content of chromium, nickel, and molybdenum is similar to austenitic stainless steels, and therefore provides aqueous corrosion resistance comparable to these steels.

Is A286 usable at subzero temperatures?
Many high strength materials can become brittle at low temperatures, but A286 is not one. Since it remains ductile at cryogenic temperatures, it can be a good choice for non-magnetic strength down to around -320°F.

Q: I need a 12 point bolt for a vacuum application with low off-gassing, min yield of 120 ksi, low magnetic permeability and minimum operating temps of 400C / 750F. Is Inconel 718 a good choice?

A: An Inconel 718 bolt will certainly work. The only other material you may want to consider would be an A286 in the cold worked version which will get you a min Tensile of 160ksi and a min yield of 120ksi. A286 bolts are readily available in a Socket Head Cap Screw design (if lead time is important) but if you need a 12 Point it could be made that way.  Same is true for Inconel 718.

For more information on A286 see the link: https://www.extreme-bolt.com/a-286-fasteners-flanges.html

 

Q: I’m working with a high temperature waste to fuel application that operates at 1000F normally but could spike to 1200F. Currently I am using Grade 8 bolts but I am concerned about the oxidation resistance of them and their stability at high temperatures.  Do you have any material recommendations? 

A: One of the best materials to consider for your high temperature application is A-286.  A286 bolts will be strong, oxidation resistant and thermally stable.  This will provide you will an significantly improved solution over Grade 8 alloy steel. An A286 bolt is also usable to 1300F.

Q: I need a shoulder bolt that will not change its shape at elevated temperatures. The bolt is near a mild carbon steel welding process and is under a small load. It is not in the heat affected zone, but it does see an elevated temperature. I am not sure exactly, but if we assume it sees 80% of the A 36 melting temperature, then we should be conservative. Any suggestions appreciated.

A:  For elevated temperatures I would recommend an A-286 shoulder bolt. A-286 fasteners are known for their high strength, creep resistance and oxidation resistance at elevated temperatures. This material would be a significant improvement over carbon steel. A286 bolts will retain their strength to 1300°F .