S-91268A583 9/16"-12 x 5 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel 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 for reliable performance in demanding applications.
- Superior corrosion resistance provided by the black-oxide finish, extending service life in harsh industrial environments.
- Optimized thread engagement through UNC coarse threading and Class 2A thread fit, ensuring secure fastening and vibration resistance.
- Enhanced durability with Rockwell C33 hardness, maintaining structural integrity under high-stress conditions.
- Secure installation and removal facilitated by the external hex drive and hex head design, compatible with standard tools.
- Versatile partial threading allowing for precise clamping force control in assembly operations.
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality and safety.
Professional Applications & Engineering Value
This 9/16"-12 UNC Grade 8 hex head screw delivers critical engineering solutions where high tensile strength and corrosion resistance are paramount. The black-oxide finish effectively combats oxidation in industrial settings, while the coarse UNC threading ensures rapid assembly and reliable hold in materials like steel and heavy machinery components. With a partially threaded design, it provides optimal unthreaded shank strength for shear applications, reducing the risk of thread stripping. Ideal for construction, automotive, and manufacturing sectors, this heavy-duty fastener meets rigorous ASME B18.2.1 and SAE J429 specifications, offering engineers a dependable choice for structural connections that demand longevity and compliance with environmental regulations like RoHS and REACH.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit with UNC coarse threading (9/16"-12) and a length of 5 1/2". Manufactured from high-strength Grade 8 steel, it adheres to ASME B18.2.1 and SAE J429 standards, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial use without hazardous substances.
