S-91309A725 1/2"-13 x 3 1/4" 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
- Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments.
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and stress.
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation.
- Coarse UNC thread design allows for faster installation and superior grip in various materials.
- Class 2A thread fit offers consistent, reliable engagement for simplified assembly and disassembly.
- Full threading along the 3-1/4" length maximizes holding power and versatility in applications.
- External hex drive with 3/4" head width enables high-torque installation with standard tools.
Professional Applications & Engineering Value
Engineered for demanding industrial and construction assemblies, this 1/2"-13 UNC hex head screw addresses critical fastening challenges. The high-strength steel construction, combined with a zinc-plated finish, provides robust protection against corrosion and environmental degradation, ensuring long-term structural integrity. The coarse thread design enhances grip in wood, metal, and composite materials, reducing the risk of stripping and enabling quicker installations. With a fully threaded shank and external hex drive, it delivers uniform clamping force and efficient torque application, making it ideal for heavy-duty machinery, structural frameworks, and mechanical systems where reliability is paramount.
Specification Summary & Compliance
This screw adheres to ASME B18.2.1 specifications under ASTM A307, ensuring dimensional accuracy and performance consistency. The UNC coarse thread maintains a Class 2A thread fit for standard tolerance, while the inch system measurements (e.g., 1/2"-13 thread size, 3-1/4" length) guarantee compatibility. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, supporting sustainable and safe usage in global markets.
