S-91257A734 1/2"-13 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 tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness (Rockwell C33) provides excellent wear resistance and durability, ideal for repetitive assembly and disassembly.
- Coarse UNC threads with Class 2A fit offer quick and secure installation, reducing assembly time and improving efficiency.
- External hex drive design allows for easy tightening with standard tools, enhancing usability in confined spaces.
- Partial threading provides unthreaded shank for better shear strength and alignment in structural connections.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in machinery and equipment.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as construction machinery, automotive assemblies, and structural frameworks. The steel material combined with a zinc yellow-chromate plating offers robust protection against corrosion and oxidation, ensuring longevity in outdoor or humid conditions. With a coarse UNC thread and Class 2A thread fit, it delivers secure fastening without cross-threading issues, while the partial threading enhances load distribution. These features make it ideal for applications requiring high tensile strength and reliability, reducing downtime and maintenance costs in industrial fasteners systems.
Specification Summary & Compliance
This screw adheres to precise dimensional tolerances, including a Class 2A thread fit and UNC thread type with a size of 1/2"-13. It meets ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring consistent performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in global supply chains.
