S-91236A734 1/2"-13 x 5 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

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 load-bearing capacity for heavy-duty applications
• Class 2A thread fit provides consistent assembly and secure fastening with standard nuts
• Rockwell B69 hardness offers excellent durability and resistance to wear during repeated use
• External hex drive design allows for easy installation and removal with common tools
• Coarse UNC threading enables quick assembly and reduced cross-threading risks
• Partial threading provides unthreaded shank for precise clamping in structural connections

Professional Applications & Engineering Value

This 1/2"-13 UNC hex head screw is engineered to address critical fastening challenges in industrial applications such as machinery assembly, structural steel connections, and heavy equipment manufacturing. The high-strength steel construction combined with zinc plating delivers reliable corrosion protection, preventing premature failure in humid or outdoor environments. The coarse thread spacing and Class 2A thread fit ensure rapid installation while maintaining vibration resistance, reducing assembly time and maintenance costs. With its external hex drive and partially threaded design, it provides optimal clamping force distribution, making it ideal for applications where joint integrity is paramount under dynamic loads.

Specification Summary & Compliance

This hex head screw features 1/2"-13 UNC coarse threads with Class 2A dimensional accuracy per ASME standards. Manufacturing complies with ASME B18.2.1 specifications where identified with ASTM A307. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial use.