S-91247A601 5/16"-18 x 4 1/2" 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
- Exceptional tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Zinc plating provides superior corrosion resistance, extending the service life of the screw in harsh industrial environments.
- Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and resistance to wear and deformation.
- Coarse UNC threads and Class 2A thread fit enable quick and secure installation, minimizing assembly time and improving joint integrity.
- Partially threaded design allows for precise clamping force control, ideal for applications where specific grip range is critical.
- External hex drive and hex head facilitate easy installation and removal with standard tools, enhancing maintenance efficiency.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in various mechanical systems.
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw is engineered to address common industrial fastening challenges, such as vibration loosening and environmental degradation. The Grade 5 steel material, combined with a zinc-plated finish, provides robust resistance against corrosion and mechanical stress, making it ideal for heavy-duty applications in construction, machinery assembly, and automotive sectors. The coarse thread design ensures secure engagement in a variety of materials, while the partial threading offers optimized load distribution. By meeting stringent standards like ASME B18.2.1, this screw delivers reliable performance in high-stress environments, reducing maintenance needs and enhancing operational safety for B2B users.
Specification Summary & Compliance
This screw adheres to precise dimensional tolerances, including a Class 2A thread fit and UNC thread type, ensuring compatibility and ease of use. It conforms to ASME B18.2.1 and SAE J429 specifications for consistent manufacturing quality. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental safety and regulatory requirements in global markets.
