A286 Fasteners – The Complete Guide to High-Temperature Iron-Nickel-Chromium Alloy Bolts, Nuts & Studs
When your design requires high-temperature strength and corrosion resistance without the cost of nickel-base superalloys, A286 fasteners are the proven solution. RAYCHIN LIMITED, a specialized manufacturer and global supplier of high-performance alloy fasteners, offers a comprehensive range of A286 (UNS S66286) bolts, nuts, washers, stud bolts, 12-point aerospace bolts, and custom-machined parts. This guide combines product details with in-depth technical knowledge to help engineers and procurement teams select the right fastener with confidence.
Product Range
A286 Hex Bolts
ASME B18.2.1 / DIN 931/933. Sizes M6–M48 (metric), 1/4″–2″ (imperial). Class D (130 ksi min tensile) standard.
A286 12-Point Aerospace Bolts
For high-torque aerospace applications. Compact head design for confined spaces. Custom configurations available.
A286 Socket Head Cap Screws
ASME B18.3. Sizes #4–1″ (imperial), M3–M24 (metric). MoS₂ or silver anti-seize coatings available.
A286 Stud Bolts & Threaded Rod
Double-end studs per ASME B16.5. Fully threaded rod up to 3 meters. M6–M72 / 1/4″–2-1/2″.
A286 Nuts & Washers
Heavy hex nuts, standard nuts, washers. Precision-matched for vibration-resistant assemblies.
Custom A286 Parts
Special threads, non-standard heads, stepped studs, and precision-machined components per drawing.
Material Specifications & Standards
Available Sizes & Thread Standards
Larger or special sizes can be manufactured on request. Please contact our sales team for a custom quotation.
What is A286 Alloy? (Technical Guide)
A286 (UNS S66286, W.Nr. 1.4980) is a precipitation-hardening, austenitic iron-nickel-chromium superalloy that is one of the original superalloys developed for high-temperature service[reference:0]. It was specifically designed for applications requiring high strength and corrosion resistance up to 1,300°F (704°C), and also performs well in cryogenic environments[reference:1].
Chemical Composition
The typical chemical composition of A286 includes[reference:2]:
Heat Treatment
A286 achieves its optimal mechanical properties through a two-step heat treatment process[reference:3]:
- Solution Treatment: Two options are available. 1,650°F (899°C) for 2 hours with water or oil quench is used where higher tensile and yield strengths are desired. 1,800°F (982°C) for 1 hour with water or oil quench is used where optimum creep and stress-rupture strengths are required.
- Aging: 1,300–1,400°F (704–760°C) for 16 hours, air cool.
Key Properties of A286 Fasteners
- Ultra-High Tensile Strength: A286 achieves tensile strengths of 1,317 MPa (191,000 psi) and yield strengths of 1,179 MPa (171,000 psi) in the cold-drawn and aged condition[reference:4]. Solution-treated and aged material typically delivers ≥900 MPa tensile strength[reference:5].
- Excellent High-Temperature Performance: Maintains strength and oxidation resistance up to 700°C (1,300°F), with short-term automotive exhaust exposure up to 900°C[reference:6][reference:7].
- Superior Creep and Stress-Rupture Strength: The 1,800°F solution treatment optimizes creep resistance, making A286 ideal for high-temperature bolting applications.
- Good Corrosion Resistance: Similar to austenitic stainless steels in many environments, with superior resistance to sulfurous atmospheres at elevated temperatures compared to nickel-base alloys[reference:8].
- Cost-Effective Alternative: Compared to nickel-based superalloys like Inconel 718, A286 offers excellent high-temperature performance at significantly lower material cost.
A286 vs. Inconel 718: When to Choose Which
Applications of A286 Fasteners
- Aerospace & Defense: Jet engine fasteners (turbine case bolts, compressor bolts), airframe components, rocket motor cases, and auxiliary power unit (APU) fasteners[reference:9].
- Oil & Gas: Wellhead equipment, offshore platform fasteners, refinery stud bolts, and sour gas (H₂S) service components[reference:10].
- Automotive & Motorsport: Turbocharger housings, exhaust manifold bolts, EGR valve attachments, and high-temperature engine fasteners[reference:11].
- Energy & Power Generation: Gas turbine bolts, nuclear reactor fasteners, and boiler components[reference:12].
- Chemical Processing: Reactor bolts, heat exchanger fasteners, and piping system studs handling acids and chlorides[reference:13].
- Industrial Gas Turbines: Compressor and turbine section fasteners requiring high-temperature strength.
Quality Assurance & Testing
RAYCHIN LIMITED is committed to supplying A286 fasteners that meet the highest quality standards. Our rigorous quality control includes:
- Material Test Certificates (EN 10204 3.1 / 3.2)
- Full chemical analysis and mechanical testing (tensile, yield, elongation, reduction of area)
- Positive Material Identification (PMI) for alloy verification
- Hardness testing (Brinell 248–321 HB after aging)[reference:14]
- Stress rupture and creep testing as required
- NACE MR0175 / ISO 15156 compliance for sour service
- Third-party inspection and testing available upon request
How to Select the Right A286 Fastener
- Temperature Requirements: For applications below 700°C (1,300°F), A286 delivers optimal strength and creep resistance. Beyond this range, consider nickel-based alloys like Inconel 718[reference:15].
- Corrosive Environment: Choose A286 for environments with chlorides, acids, or sulfur compounds. Its chromium and molybdenum content provides superior pitting and stress corrosion cracking (SCC) resistance[reference:16].
- Mechanical Properties: Ensure the fastener's tensile strength (≥900 MPa) and hardness (HRC ≥35) align with application loads. For high-vibration scenarios, prioritize fatigue-resistant grades.
- Heat Treatment: Specify solution-annealed (980°C) and aged (720°C, 16 hours) fasteners for peak strength and microstructural stability.
- Galvanic Compatibility: Pair A286 bolts with A286 nuts and washers to prevent differential corrosion and ensure joint integrity.
- Certifications & Standards: Verify compliance with AMS 5731/5737 (ASTM A453), ISO 15156 (NACE MR0175), and material traceability (MTRs)[reference:17].
Frequently Asked Questions
What is A286 alloy and what is it used for?
A286 is a precipitation-hardening iron-nickel-chromium superalloy (UNS S66286) designed for high strength and corrosion resistance at temperatures up to 700°C (1,300°F). It is widely used for aerospace fasteners, jet engine components, oil & gas equipment, and automotive turbochargers.
What is the difference between A286 and Inconel 718?
A286 is an iron-based superalloy offering excellent strength up to 700°C at a lower cost than nickel-based alloys. Inconel 718 is a nickel-based alloy with higher strength and oxidation resistance at temperatures above 700°C, but at significantly higher material cost.
Which standards cover A286 fasteners?
A286 fasteners typically comply with AMS 5731 (solution treated), AMS 5732 (solution treated + aged), AMS 5737 (1650°F solution + aged), ASTM A453 Grade 660, and ASTM A638. Other standards include DIN 1.4980 and BS HR 51/52.
What is the maximum service temperature for A286 fasteners?
A286 fasteners maintain good mechanical properties from cryogenic temperatures up to approximately 700°C (1,300°F). For short-term exposure, automotive exhaust applications may see temperatures up to 900°C (1,652°F).
Does RAYCHIN provide material test certificates for A286 fasteners?
Yes, RAYCHIN LIMITED provides EN 10204 3.1 / 3.2 certificates, chemical analysis, tensile reports, PMI, hardness testing, and additional testing including stress rupture and NACE MR0175 compliance as required.
Can A286 fasteners be used in seawater?
A286 offers moderate seawater resistance but is generally outperformed by nickel-based alloys like Monel or Hastelloy in continuous seawater immersion. It is suitable for marine applications where high temperature strength is also required.
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