S-91236A597 5/16"-18 x 3 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength 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 60,000 psi ensures reliable performance in demanding industrial applications, reducing the risk of fastener failure.
- Zinc plating finish provides excellent corrosion resistance, extending the service life of the screw in various environments.
- Partially threaded design offers superior grip and vibration resistance, ideal for applications where secure clamping is critical.
- Coarse UNC threads with Class 2A fit allow for quick installation and easy alignment, saving time during assembly.
- External hex drive and hex head enable straightforward tightening with common tools, enhancing efficiency in maintenance and construction.
- Compliance with ASME B18.2.1 and ASTM A307 standards guarantees consistent quality and interoperability, ensuring peace of mind for engineers.
- Rockwell B69 hardness contributes to durability and wear resistance, supporting long-term use in heavy-duty settings.
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 corrosion. Made from steel with a zinc-plated finish, it resists rust and wear, making it suitable for outdoor machinery, structural assemblies, and automotive applications. The partial threading ensures a firm hold on materials, reducing the need for frequent retightening in high-stress environments. By incorporating coarse threads and an external hex drive, it simplifies installation in tight spaces, boosting productivity. Ideal for heavy-duty fastening solutions, this screw meets rigorous standards to deliver consistent performance and reliability in sectors like construction and manufacturing.
Specification Summary & Compliance
The screw features a Class 2A thread fit for standard tolerance and easy assembly, adhering to UNC thread standards. It complies with ASME B18.2.1 and ASTM A307 manufacturing specifications, ensuring dimensional accuracy and mechanical properties. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety regulations for global use.
