Tag: A286 High Temperature Fasteners

MP159 Screws for High Temperatures

Q: I’m in the testing phase of a new application that will require a high strength bolt that has a yield strength of about 220ksi. The biggest problem is that the bolts will also be exposed to burst of high temperature of about 1000F. Is there any material you can suggest that could handle this.

A: Yes, in fact there is a material that is especially made to handle situations like this. MP159 bolts are made of an alloys that is often used by aerospace boosters and turbine engines. It offers a yield strength of about 265 ksi. In addition, MP159 bolts can be used at temperatures up to 1100F for continuous use and slightly beyond for short term interval use.

High Temperature A-286 Fasteners vs Molybdenum fasteners

Q: I need some high temperature engine components that can provide high strength (100ksi yield) to 1000F as well as oxidation resistance? Are molybdenum bolts good for that?

A: Though Molybdenum is excellent in high temperature environments its generally reserved for very high temperature vacuum application where no oxygen is present. In addition your on the edge of molybdenum strength range. A better material choice would be A-286 fasteners. They are actually made for high temperature oxidation resistance and offer about 111ksi in yield strength which is in your range. They also maintain most of their strength to 1000F and could go to 1300F which will provide you the high temperature fastener you need as well.