... resistance is useful for high-temperature springs and bolts. Alloy X-750 is used in gas turbines, rocket engines, nuclear ... reactors, pressure vessels, tooling, and aircraft structures.PropertiesNon-magnetic. Alloy X-750 has good elevated temperature strength properties to 1300ºF ... 1.Size and type: Bolt: M3-M64 hexagonal head, hex socket head, CSK,flange boltNut: M3-M64 hexagonal, wing/butterfly nut ...