A-286 (Alloy 660)

UNS S66286 nickel_superalloy
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Iron-nickel-chromium precipitation-hardening superalloy used extensively for aerospace fasteners requiring high strength up to 700°C with good oxidation resistance.

Applicable Standards

  • AMS 5525
  • AMS 5726
  • AMS 5895
  • ASTM A638

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Fe 50.0 58.0 ~54.0
Ni 24.0 27.0 ~25.5
Cr 13.5 16.0 ~14.75
Mo 1.0 1.5 ~1.25
Ti 1.9 2.35 ~2.12
Al 0.1 0.35 ~0.22
Fe 50.0–58.0% Ni 24.0–27.0% Cr 13.5–16.0% Mo 1.0–1.5% Ti 1.9–2.35% Al 0.1–0.35%

Typical Applications

  • Aerospace fasteners and bolts
  • Jet engine components
  • Gas turbine discs and casings
  • High-temperature structural parts
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