S-91309A721 1/2"-13 x 2 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 demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 2A thread fit provides smooth installation and secure fastening with reduced risk of cross-threading
- Fully threaded design offers maximum grip length and uniform load distribution across the entire fastener
- External hex drive with 3/4" head width enables high-torque installation using standard tools
- Coarse UNC thread pattern allows for faster assembly and better performance in softer materials
- Rockwell B69 hardness rating delivers excellent durability and resistance to wear and deformation
Professional Applications & Engineering Value
These 1/2"-13 UNC hex head screws deliver exceptional engineering value for industrial applications where structural integrity and reliability are paramount. Manufactured from ASTM A307 steel with zinc plating, they provide superior corrosion protection in harsh environments while maintaining consistent performance. The coarse thread design ensures rapid installation in structural steel, heavy machinery, and construction applications, reducing assembly time without compromising strength. With fully threaded construction and Class 2A thread fit, these screws eliminate the common issues of thread stripping and improper seating, providing secure, vibration-resistant connections that withstand dynamic loads and thermal cycling in industrial settings.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit with 1/2"-13 UNC coarse threads and right-hand threading. Manufactured to ASME B18.2.1 specifications using ASTM A307 steel, it delivers consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while meeting international quality standards for heavy-duty fastening applications.
