A286 Bolt Torque Range

Q: Hi, I need a torque range for a A286 (aged, 160 ksi UTS) 1″-8 hex bolt. The
calculator gives a torque value of 826 ft*lbs but is there a range that is
acceptable?

A: One thing you have to remember about torque, is it is an approximation. You could easily be within plus or minus 40% from bolt to bolt depending on a variety of factors, such as dirt, debris, lubrication etc. See the link to a blog written about this for more information.

https://www.extreme-bolt.com/blog/torque-part-2-how-to-really-measure-tension/

What Does Specification ASTM F2281 Mean?

Q: My customer is asking for a 1/2″ bolt for a high temperature application to 1300F that is to the spec ASTM F2281. What material is this and what is ASTM F2281?

A: The specification ASTM F2281 covers several materials including Inconel, Alloy 330 and A286. The spec does not designate a specific material, it just ensures that these materials covered under this specification meet certain mechnical requirements when the effects of extreme heat are critical. Here is a link to a chart that covers this specification.
Also if you are looking for a material covered by this spec that is usable to 1300F, all those I listed can be used to this temperature limit, it would just depend on other factors such as corrosion and high strength requirements.

A286 ASTM F2281 for Temperatures up to 1800°F

Q: I’m a purchasing agent and one of our engineers is requesting a 1/2″-13 x 2″ hex head bolt that is material A286 meeting F2281? What is F2281 mean?

A: Good question. F2281 is a national standards specification put in place by the ASTM. An A286 bolt that meets the F2281 is one that meets specific chemical and mechanical requirements. This specification is important for processes where heat and the effects of high temperature are critical and guarantees the fasteners will meet certain standards and be tested to them.