A286 fasteners are premium, age-hardenable austenitic stainless steel fasteners designed for applications demanding exceptional strength and corrosion resistance at elevated temperatures. As a key high temperature fastener and aerospace fastener, A286 (also known as A-286 material, UNS S66286, or Alloy 660) is the material of choice where standard stainless steels like 304 or 316 fail. This guide covers the complete A286 fastener material properties, its equivalents, and applications.

Complete Chemical Composition of A286 Stainless Steel:

The outstanding high-temperature strength of A286 material comes from its precise alloying, which enables precipitation hardening. The full chemical composition includes:

• Iron (Fe): Balance

• Chromium (Cr): 13.5 - 16.0% - Provides oxidation and corrosion resistance.

• Nickel (Ni): 24.0 - 27.0% - Stabilizes the austenitic matrix and contributes to high-temperature strength.

• Molybdenum (Mo): 1.0 - 1.5% - Increases strength and aids in creep resistance.

• Titanium (Ti): 1.9 - 2.35% - The key age-hardening element; forms gamma prime precipitates (Ni3Ti).

• Vanadium (V): 0.10 - 0.50%

• Aluminum (Al): ≤ 0.35% - Contributes to age hardening.

• Manganese (Mn): ≤ 2.00%

• Silicon (Si): ≤ 1.00%

• Boron (B): 0.001 - 0.010% - Enhances creep strength.

• Carbon (C): ≤ 0.08%

• Phosphorus (P): ≤ 0.025%

• Sulfur (S): ≤ 0.025%

Mechanical Properties of A286 Fastener Material:

A286 fasteners are solution-treated and age-hardened to achieve their remarkable A286 bolt strength. Key A286 fastener material properties include:

• Tensile Strength: ≥ 900 MPa (130 ksi) min. (For ASTM A453 Grade 660 Class B/Type 1 condition)

• Yield Strength (0.2% Offset): ≥ 585 MPa (85 ksi) min. – This high A286 bolt yield strength is critical for load-bearing applications.

• Elongation: ≥ 15%

• Hardness (Typical): 248 - 321 HB / 25 - 35 HRC

• Shear Strength: The A286 bolt shear strength is exceptionally high, typically around 65-70% of its ultimate tensile strength, making it ideal for highly stressed dynamic joints.

• Service Temperature: Maintains excellent properties from cryogenic temperatures up to 700°C (1300°F).

A286 Fasteners Equivalent Grades & Standards:

• UNS: S66286

• AMS: 5731 (Bar), 5732 (Forging), 5737 (Bolt & Screw)

• ASTM/AISI: A286, A453 Grade 660

• Werkstoff Nr.: 1.4980

• Common Names: Alloy 660, Super Alloy A286

Primary Application Fields:

A286 stainless steel fasteners are critical in industries where performance under stress and heat is non-negotiable:

• Aerospace & Jet Engines: The primary application for aerospace bolts and jet engine fasteners, used in turbine frames, afterburner components, and high-temperature airframe structures.

• Automotive (High-Performance): In turbocharger systems, exhaust manifolds, and high-stress engine components.

• Industrial Gas Turbines: For bolts and studs in hot sections.

• Nuclear Power: Used in reactor internal components due to its strength and radiation resistance.

• High-Temperature Processing Equipment: For fixtures, bolts, and assemblies in furnaces and heat-treating equipment.

Classification of A286 Fasteners and Their Specific Applications:

1. A286 Bolts, Studs, and Nuts:

   • Application: Standard A286 hex head bolts and A286 stud bolts are used for high-integrity flanges in turbine casings, pressure vessels, and exhaust systems. Their high A286 bolt shear strength makes them vital for structural connections.

2. A286 Screws:

   • A286 Socket Head Cap Screws: Used in compact, high-strength assemblies in aerospace actuators and machinery.

   • A286 Flat Head Screws: Specifically, A286 flat head screw (100° countersunk) variants are essential for creating smooth, aerodynamic surfaces in aircraft skins and panels where rivets are not suitable.

3. A286 Special Fasteners:

   • Application: Includes A286 clevis pins, A286 U-bolts, and custom machined parts for securing high-temperature ducts, wiring, and instrumentation.

4. A286 Washers and Shims:

   • Application: Used with A286 bolts to distribute load and compensate for thermal expansion in turbine and engine assemblies.

Why Specify Genuine A286 Fasteners?

Our A286 high temperature fasteners are sourced and certified to meet strict AMS and ASTM specifications, ensuring you get the full A286 bolt strength and material properties as defined. For engineers seeking A286 fasteners equivalent to OEM standards for jet engines, turbines, or extreme-environment applications, our inventory provides reliable, traceable, and high-performance heat resistant fasteners.

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