S-92620A254 5/8"-18 x 8 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 tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating of Rockwell C33 provides excellent wear resistance and durability under heavy loads.
- Fine UNF threading (5/8"-18) offers improved vibration resistance and secure fastening in precision assemblies.
- Partially threaded design allows for controlled clamping force and easier alignment in structural applications.
- External hex drive enables quick installation and high torque application with standard tools, boosting efficiency.
- Compliance with major standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interoperability in global projects.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, construction, and automotive systems. The steel material combined with zinc yellow-chromate plating provides robust protection against corrosion and environmental wear, making it ideal for outdoor or humid conditions. The 5/8"-18 UNF fine thread enhances grip and vibration resistance, reducing loosening in dynamic applications. With a partial threading design, it allows precise load distribution and simplifies installation in complex structures. Meeting ASME B18.2.1 and SAE J429 specifications, this fastener delivers reliable performance for engineers seeking high-strength, compliant solutions in demanding projects.
Specification Summary & Compliance
This product features precise Class 2A thread fit and adheres to UNF fine thread standards for consistent engagement. It complies with ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring dimensional accuracy and reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.
