S-91257A632 3/8"-16 x 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 strength for demanding applications with Grade 8 classification and 150,000 psi tensile strength, ensuring reliable performance under high stress.
- Superior corrosion resistance provided by the zinc yellow-chromate plating, extending the fastener's service life in harsh industrial environments.
- Optimized for high-torque installation thanks to the external hex drive and hex head design, allowing for secure tightening with standard tools.
- Reliable thread engagement and vibration resistance from the 3/8"-16 UNC coarse thread and Class 2A thread fit, minimizing the risk of loosening.
- Versatile partial threading offers a non-threaded shank for precise clamping and shear strength where needed.
- Consistent quality and interchangeability ensured by compliance with ASME B18.2.1 and SAE J429 standards.
- Safe for regulated industries with RoHS 3 and REACH compliance, meeting environmental and health standards.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, structural frameworks, and automotive systems. The steel material combined with Rockwell C33 hardness provides excellent durability and resistance to wear, while the zinc yellow-chromate plating offers robust protection against corrosion, reducing maintenance needs. The 3/8"-16 UNC coarse thread and partially threaded design ensure quick installation and secure fastening in materials prone to vibration, preventing joint failure. By meeting ASME B18.2.1 specifications, it guarantees precision and reliability, making it ideal for engineers and procurement specialists seeking high-performance industrial fasteners that enhance operational safety and efficiency.
Specification Summary & Compliance
This fastener features a 3/8"-16 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, a length of 2", and a minimum thread length of 1". It complies with ASME B18.2.1 and SAE J429 standards for manufacturing consistency, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental and safety compliance.
