A-286 (UNS S66286): Precipitation-Hardening Alloy for Fasteners to 700°C
AMS 5731 / ASTM A453 Gr 660 · Published: 2026-06-02 · Updated: 2026-06-02
A-286 is the standard aerospace fastener alloy for 500-700°C service — where 17-4PH is too weak and Inconel 718 is overkill. Gamma-prime (Ni3(Ti,Al)) precipitation provides strength. For gas turbine bolting, springs, and fasteners. Iron-base =...
A-286 is the standard aerospace fastener alloy for 500-700°C service — where 17-4PH is too weak and Inconel 718 is overkill. Gamma-prime (Ni3(Ti,Al)) precipitation provides strength. For gas turbine bolting, springs, and fasteners. Iron-base = fraction of nickel alloy cost.
Quick Facts
| Category | Stainless Steel |
| Standard | AMS 5731 / ASTM A453 Gr 660 |
| Density | 7920 kg/m³ |
| Yield Strength | 690 MPa (aged) |
| Tensile Strength | 1,000 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
A-286 vs 17-4PH for fasteners?
17-4PH limited to ~315°C. A-286 maintains strength to 700°C. For 300-700°C fasteners, A-286 is standard.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu