S-90409A193 5/8"-18 x 3 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws
High-Strength Grade 8 Steel Flanged Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications.
- Superior corrosion resistance and durability due to Grade 8 steel construction and Rockwell C32 hardness.
- Secure, vibration-resistant fastening from the flanged design and UNF fine threading with Class 2A fit.
- Easy installation and removal with the external hex drive and 15/16" head width for standard tool compatibility.
- Optimized for partial-thread applications where unthreaded shank sections provide enhanced shear strength.
- Compliance with stringent industry standards including IFI 111/SAE J429, ensuring consistent quality and interchangeability.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global supply chain suitability.
Professional Applications & Engineering Value
This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where joint integrity is paramount. The partially threaded design with a 1 1/2" minimum thread length concentrates clamping force precisely, reducing stress concentration in dynamic load environments. Its UNF fine thread and Class 2A fit provide superior resistance to loosening under vibration, while the flanged base distributes load evenly, minimizing surface damage. Made from high-strength steel and heat-treated to Rockwell C32 hardness, it withstands extreme tensile and shear forces, making it ideal for structural frames, engine components, and industrial equipment requiring 150,000 psi tensile strength and long-term reliability.
Specification Summary & Compliance
This fastener adheres to precise dimensional standards with Class 2A thread fit and 5/8"-18 UNF fine threading, ensuring consistent engagement and interchangeability. It conforms to IFI 111 SAE J429 for mechanical properties and material quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting sustainable procurement practices in industrial sectors.
