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Inconel718 hex bolt

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Inconel 718 (UNS N07718):
The Ultimate Fastener Material for Extreme Environments
When it comes to high-strength fasteners that must survive intense heat and corrosive pressure, Inconel 718 (standardized as UNS N07718) is the industry gold standard. This nickel-chromium superalloy is engineered for performance where standard stainless steel would fail.
Inconel 718 is a precipitation-hardenable superalloy known for its exceptional tensile and creep-rupture strength at temperatures up to 1300°F (700°C). Its unique chemical composition allows it to resist oxidation and corrosion in both cryogenic and high-heat environments, making it a critical material for the aerospace, nuclear, and oil and gas sectors.
Inconel718 also could called UNS N07718 ,2.4668, Nickle alloy N07718

Table of Contents

Inconel718 fastener applications

Due to its high fatigue strength, UNS N07718 is the preferred material for manufacturing heavy-duty fasteners. Common hardware includes:
  • Hex Bolt and Heavy Hex Bolt: Used in structural applications where high torque and large bearing surfaces are required.
  • Stud Bolt and Full Thread Rod: Essential for flange connections in high-pressure piping systems.
  • Hex Screw and Square Head Bolt: Utilized in specialized machinery and legacy industrial equipment where high-temperature stability is non-negotiable.

Manufacture standard of Inconel718

To ensure the reliability of a bolt, stud bolt, or hex screw, manufacturers must adhere to strict international standards:
    • ASTM B637: The primary specification for precipitation-hardening nickel alloy bars, forgings, and fastener stock.
    • AMS 5662 / 5663: Aerospace Material Specifications for high-quality bars and parts.
    • ASME SB637: The standard applied for pressure vessel and nuclear applications.
    • NACE MR0175: Essential for heavy hex bolt and full thread rod applications in “sour” gas environments (oil and gas).

Whether you are sourcing a standard hex bolt or a custom-length full thread rod, choosing Inconel 718 ensures your project stands up to the most demanding thermal and mechanical stresses.
The mechanical strength of Inconel 718 (UNS N07718) is primarily derived from Precipitation Hardening (Age Hardening). Without the specific heat treatment cycles detailed below, the material would not achieve the high-stress durability required for critical fasteners like a heavy hex bolt or a full thread rod.
Understanding the Heat Treatment Process
  1. Solution Annealing: This first stage dissolves the alloying elements into the nickel matrix. It essentially “resets” the grain structure, making it uniform. Rapid cooling (quenching) then prevents these elements from clumping together prematurely.
  2. Double Aging: This two-step process allows the \( \gamma’ \) and \( \gamma” \) (gamma prime and double prime) phases to precipitate. These microscopic particles act as “obstacles” that prevent the metal’s crystal structure from sliding, which gives the stud bolt or hex screw its incredible strength at high temperatures.

Inconel718 UNS N07718 Technical profile

Inconel 718 is a precipitation-hardenable nickel-chromium superalloy designed for extreme mechanical performance and corrosion resistance. It is the premier choice for high-strength fasteners used in aerospace, energy, and subsea oil and gas applications.

Chemical Composition & Manufacturing Standards

Element Content (%) Primary Standard
Nickel (Ni) 50.0 – 55.0 ASTM B637
AMS 5662 / 5663
NACE MR0175
Chromium (Cr) 17.0 – 21.0
Niobium (Nb) 4.75 – 5.50
Iron (Fe) Balance

Inconel 718 Fastener Product Range

  • Hex Bolt & Heavy Hex Bolt: Ideal for high-torque structural assemblies.
  • Stud Bolt & Full Thread Rod: Preferred for high-pressure flange connections.
  • Hex Screw & Square Head Bolt: Critical for high-temperature industrial machinery.

The Heat Treatment Process

To reach its ultimate tensile strength (185-220 ksi), Inconel 718 must undergo precise age hardening. This process includes:

  1. Solution Anneal: Heating to ~980°C to homogenize the alloy.
  2. Aging: A two-step holding process at 718°C and 621°C to precipitate strengthening phases.

At Jiangsu high hope industry, we specialize in supplying high-strength fasteners for the most demanding industrial environments. Our Inconel 718 (UNS N07718), Inconel 625, and Monel K500 products are engineered to withstand extreme heat, high pressure, and corrosive chemical exposure.

1. Inconel 718 (UNS N07718): The Strength Leader

Inconel 718 is a precipitation-hardened superalloy. Its ability to maintain structural integrity up to 1300°F (700°C) makes it the standard for aerospace and high-pressure oil and gas applications.

Mechanical Property Value (Typical) Key Fastener Standards
Tensile Strength (UTS) 180 – 200 ksi (1240-1400 MPa) ASTM B637
AMS 5662 / 5663
NACE MR0175
Yield Strength (0.2%) 150 – 175 ksi (1035-1200 MPa)
Hardness (Rockwell C) 36 – 44 HRC

2. Comparison: 718 vs. 625 vs. Monel K500

Choosing the right material is critical for safety and longevity. Below is a comparison of our core nickel alloy offerings:

Alloy UNS Number Primary Advantage Common Applications
Inconel 718 N07718 Extreme Yield Strength Gas Turbines, Rocket Motors
Inconel 625 N06625 Superior Corrosion Resistance Marine Hardware, Chemical Plants
Monel K500 N05500 Non-Magnetic / Sea Water Proof Marine Shafts, Subsea Sensors

3. Available Fastener Types

We supply UNS N07718 and related alloys in all standard and custom configurations:

  • Hex Bolt & Heavy Hex Bolt
  • Stud Bolt & Full Thread Rod
  • Hex Screw & Socket Head Cap Screw
  • Square Head Bolt
  • Hex Nut & Heavy Hex Nut
  • Flat & Spring Washers

4. Heat Treatment & Manufacturing

For Inconel 718 to reach its full potential, it undergoes a Solution Anneal followed by a Double Aging cycle (typically 718°C and 621°C). This ensures that your stud bolt or full thread rod meets the fatigue resistance required by API and aerospace protocols.

Procurement FAQ: Sourcing Inconel 718 Fasteners

Q1: How do I know this is genuine Inconel718 and not a cheaper substitute?
Counterfeit materials are a major risk in high-nickel alloys. 
  • Our Answer: Reliability starts with documentation. Every shipment from SS Bravo Bolt includes a comprehensive Material Test Report (MTR) or Mill Test Certificate (MTC) per EN 10204 3.1 or 3.2. This verifies the exact chemical composition (Ni, Cr, Nb) and mechanical properties, ensuring 100% traceability to the original heat number

 

Q2: Can you meet specific aerospace (AMS) or industrial (ASTM) standards? 
Using the wrong specification (e.g., calling out a plate spec for a bolt) causes costly project delays. 
  • Our Answer: We manufacture strictly to industry-specific codes. Whether your purchase order requires AMS 5663 for aerospace fatigue resistance, ASTM B637 for power generation, or NACE MR0175 for “sour” oilfield environments, our production process is tailored to that specific standard.

 

Q3: Why is the lead time for Inconel 718 longer than standard bolts?
Supply chain volatility and the extreme difficulty of machining Inconel 718 can lead to broken delivery promises. 
  • Our Answer: Inconel 718 is a “super-material” that work-hardens rapidly, requiring specialized tooling and slower machining speeds. As a direct manufacturer, we mitigate lead time risks by maintaining our own raw material stock and using dedicated, wear-resistant tooling exclusively for high-nickel alloys.

 

Inconel718 fastener quality checklist

  • Documentation Verification: Always request a Material Test Report (MTR) or Mill Test Certificate (MTC) that matches the heat number permanently stamped on the bolt.
  • Visual Inspection: High-quality UNS N07718 fasteners must have a smooth, uniform surface finish. Red flags include pitting, rust, rough tool marks, or uneven threading.
  • Marking Permanence: Authentic manufacturers use permanent stamps or stencils. If the grade or manufacturer’s mark can be easily rubbed off with a cloth, the material may be a cheaper substitute.
  • Testing Compliance: Ensure the fasteners have undergone required testing such as PMI (Positive Material Identification) to verify nickel and niobium levels, and hardness testing to confirm successful age hardening.
  • Dimensional Accuracy: Verify that thread lengths and diameters meet exact drawing requirements. For heavy hex bolts, ensure the head-to-shank transition is smooth and free of cracks or inclusions.

What Industry Leaders Say

What Industry Leaders Say

Verified Feedback from our Global Procurement Partner

“Finding a manufacturer that understands the work-hardening challenges of UNS N07718 was critical for our project. SS Bravo Bolt delivered heavy hex bolts with perfect thread integrity and full MTR documentation.”

JD
James Donovan
Procurement Manager | Aerospace Components

“For our subsea applications, the NACE MR0175 compliance is non-negotiable. Their stud bolts and full thread rods passed all our third-party inspections with zero defects.”

LW
Linda Wei
Senior Supply Chain Specialist | Oil & Gas Global

“Fast shipping and technical expertise. They helped us specify the correct square head bolts for a legacy turbine repair. Truly reliable experts in high-nickel alloys.”

RM
Robert Miller
Operations Director | Power Generation Plant

“We required Inconel 718 hex screws for a high-heat chemical reactor where thermal cycling was causing standard bolts to fail. SS Bravo Bolt provided parts with superior creep-rupture strength that exceeded our ASTM B637 requirements. Their technical team is second to none.”

AK
Arjun Kapoor
Technical Lead | Petrochemical Infrastructure

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Need a reliable fastener and CNC machining partner? Watch how our factory delivers quality non-standard parts with short lead times. 

Need a reliable fastener and CNC machining partner? Watch how our factory delivers quality non-standard parts with short lead times. Message our team on our website for pricing and availability. Message our team on our website for pricing and availability.

Products widely used in pump, valve ,oil & petrochemical pressure vessel, boiler fluid field etc.

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