S-91247A640 3/8"-16 x 4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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
- High tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Grade 5 classification with Rockwell C25 hardness provides excellent durability and resistance to wear, extending service life.
- Zinc plating finish offers enhanced corrosion resistance, protecting against rust in various industrial environments.
- Coarse UNC threads with Class 2A fit allow for quick and easy installation, saving time during assembly.
- Partially threaded design enables secure clamping in materials where full threading isn't required, improving versatility.
- External hex drive and hex head facilitate straightforward tightening with standard tools, enhancing installation efficiency.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in professional settings.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered from zinc plated steel to address common industrial challenges like vibration loosening and environmental corrosion. The coarse UNC thread and Class 2A fit ensure precise engagement in metals and other materials, reducing assembly errors in heavy-duty applications such as machinery, construction, and automotive assemblies. Its partially threaded configuration provides optimal grip strength where full threading is unnecessary, minimizing stress concentration. With a high tensile strength and robust external hex drive, it delivers reliable fastening solutions that withstand rigorous operational demands, enhancing overall structural integrity and safety.
Specification Summary & Compliance
This fastener features a 3/8"-16 UNC thread size with Class 2A thread fit for standard dimensional accuracy, and it meets ASME B18.2.1 and SAE J429 specifications. It is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence in industrial use.
