S-91286A320 1/2"-13 x 1 1/4" 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 for reliable performance in high-stress industrial applications.
- Superior corrosion resistance provided by the zinc-flake coating, extending service life in harsh environments.
- High hardness rating of Rockwell C33 ensures excellent wear resistance and durability under repetitive use.
- Easy installation and removal with the external hex drive design, allowing for standard wrench compatibility.
- Secure fastening with Class 2A thread fit offering consistent engagement and vibration resistance in coarse UNC threads.
- Full threading along the 1-1/4" length enables versatile positioning and strong grip across the entire fastener.
- Compliance with industry standards including ASME B18.2.1 and SAE J429, ensuring quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and corrosion resistance are paramount. The zinc-flake coated finish provides long-lasting protection against rust, reducing maintenance costs in outdoor or humid conditions. With its coarse UNC thread and external hex drive, it delivers quick, secure fastening in structural applications, minimizing the risk of loosening under dynamic loads. The fully threaded design ensures maximum holding power, making it ideal for demanding industrial hex screw uses that require dependable, high-performance fastening solutions.
Specification Summary & Compliance
This fastener features precise Class 2A thread fit and adheres to ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.
