Technical Specifications of Inconel 718 Socket Head Cap Screws

Inconel 718 socket head cap screws are engineered to meet the most stringent industrial requirements. These high-performance fasteners exhibit exceptional mechanical properties, including tensile strength ranging from 1,200 to 1,400 MPa and yield strength of 1,000 MPa at room temperature. The material maintains its structural integrity even at elevated temperatures up to 700°C (1292°F), making these screws ideal for extreme environments. Key technical specifications include:

• Thread sizes ranging from #0-80 to 1" diameter in both UNC and UNF series
• Lengths available from 1/4" to 6" for standard inventory items
• Hardness rating of 35-45 HRC (Rockwell C scale)
• Surface finish options: plain, Xylan® coated, or electropolished
• Compliance with ASME B18.3, DIN 912, and ISO 4762 standards

The corrosion resistance of Inconel 718 surpasses standard stainless steel fasteners by 5-8 times in salt spray tests, particularly against pitting and crevice corrosion in chloride environments. This makes them superior to alloy 625 bolts in certain high-stress applications.

Material Advantages Over Conventional Fasteners

Inconel 718's unique metallurgical composition (52.5% Ni, 19% Cr, 3% Mo, 5.1% Nb) delivers unparalleled performance advantages. The precipitation-hardened nickel-chromium alloy offers:        

       1. Thermal Stability: Maintains 85% of room temperature strength at 650°C (1200°F), outperforming Inconel 600 fasteners in sustained high-heat applications.        

       2. Stress Resistance: Exceptional fatigue strength (endurance limit of 550 MPa) makes these socket head cap screws ideal for vibration-prone assemblies.        

       3. Corrosion Protection: Forms a passive chromium oxide layer that resists:

• Oxidation up to 980°C (1800°F)
• Sulfidation in petrochemical processing
• Chloride-induced stress corrosion cracking

Compared to Inconel 625 threaded rods, the 718 variant offers superior creep rupture strength at temperatures above 600°C, making it the preferred choice for turbine engine components and nuclear reactor systems.

Critical Industry Applications

As one of the leading Inconel fasteners manufacturers, RAYCHIN LIMITED supplies these premium socket head cap screws to industries where failure is not an option:        

       Aerospace & Defense:        

• Jet engine turbine casings (FAA-approved)
• Rocket propulsion system assemblies
• Airframe structural components

Energy Sector:        

• Nuclear reactor coolant system fasteners
• Oil & gas wellhead equipment
• Geothermal power plant components

Chemical Processing:        

• Reactor vessel closures
• High-pressure piping systems
• Chlor-alkali production equipment

These applications benefit from the combination of Inconel 718's properties with the socket head cap screw's design advantages - compact head profile, high torque capability, and reliable clamping force.

Custom Engineering Solutions

RAYCHIN LIMITED's technical team specializes in developing custom Inconel fasteners for mission-critical applications. Our engineering capabilities include:        

       1. Special Thread Configurations:        

• Acme threads for lead screw applications
• Buttress threads for axial loading
• Micro-threading for precision instruments

2. Unique Head Designs:        

• Low-profile heads for confined spaces
• Torx® drive alternatives for high-torque applications
• Flanged heads for distributed load bearing

3. Material Enhancements:        

• Solution annealing for optimal grain structure
• Shot peening for improved fatigue resistance
• Special coatings for unique chemical environments

Our in-house metallurgists work closely with clients to develop Inconel dowel pins and other specialized fasteners that meet exacting performance requirements.

Quality Assurance & Compliance

Every batch of Inconel 718 socket head cap screws undergoes rigorous quality control:        

       

       Our quality management system is certified to ISO 9001:2015 and AS9100D, with full material traceability from mill to shipment. All Inconel 718 threaded rods and fasteners include material test reports (MTRs) with heat numbers and full chemical/mechanical properties.

Conclusion & Next Steps

Inconel 718 socket head cap screws represent the pinnacle of fastener technology for extreme environments. Their combination of high-temperature strength, corrosion resistance, and mechanical reliability makes them indispensable across aerospace, energy, and chemical processing industries. As a trusted Inconel fasteners manufacturer with decades of metallurgical expertise, RAYCHIN LIMITED provides:

• Technical consultation for material selection
• Custom engineering solutions
• Global logistics support
• Competitive pricing for bulk orders

For project managers and procurement specialists evaluating high-performance fasteners, our technical team stands ready to assist with application analysis, sample provision, and volume quotations. Contact our engineering specialists today to discuss your specific requirements for Inconel 718 fasteners or other specialty metal components.