Q: What is the difference between A286 per AMS 5737 and AMS 5732?Q: What is the difference between A286 per AMS 5737 and AMS 5732?
A: A286 is an age hardened material. These AMS – aerospace standards – pertain to how the A286 material is solution treated and hardened:
• AMS 5737 is solution treated at 1650°F and precipitation heat treated (aged).
• AMS 5732 is solution treated at 1800°F and precipitation heat treated (aged).
But what does this all really mean? Basically, when solution treated at 1800ºF (980ºC) A286 bolts will have the highest creep-rupture strength in age-hardened material whereas the 1650ºF (900ºC) treatment provides A286 bolts with improved ductility and room temperature strength. In addition these specifications also alter the strength of an A286 bolt.
A286 Bolts per AMS 5737
• Tensile Strength: 140 ksi (965 MPa)
• Yield Strength at 0.2% Offset: 95 ksi (655 MPa)
A286 Bolts per AMS 5732
• Tensile Strength: 130 ksi (896 MPa)
• Yield Strength at 0.2% Offset: 85 ksi (586 MPa)