S-92316A247 5/8"-18 x 4 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 and Grade 8 classification, ideal for high-stress industrial applications.
- Superior corrosion resistance due to black-phosphate steel coating, extending service life in harsh environments.
- Precise and secure fastening ensured by Class 2A thread fit and UNF fine thread design, reducing the risk of loosening under vibration.
- Enhanced grip and stability from the flanged hex head, distributing load evenly and eliminating the need for separate washers.
- Optimized installation efficiency with partially threaded shank and external hex drive, allowing for quick assembly and disassembly.
- Reliable hardness performance at Rockwell C32, maintaining structural integrity under repeated mechanical stress.
- Broad regulatory compliance meeting SAE J429, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where high tensile strength and corrosion resistance are paramount. The black-phosphate steel material provides a durable barrier against rust and wear, while the UNF fine thread and Class 2A fit deliver precise engagement, minimizing thread stripping in high-vibration settings. The flanged design enhances clamping force distribution, reducing point stress and improving joint longevity. Ideal for structural assemblies, engine components, and industrial equipment, this partially threaded screw ensures reliable performance under extreme loads, backed by compliance with industry standards like SAE J429.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances and UNF fine thread specifications (5/8"-18), with a minimum thread length of 2 1/8" and overall length of 4 1/2". Manufactured in accordance with IFI 111 / SAE J429 standards, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial reliability.
