S-91309A732 1/2"-13 x 5" 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 harsh industrial environments.
• High tensile strength of 60,000 PSI ensures reliable performance under heavy loads and vibration.
• Excellent thread engagement with Class 2A UNC coarse threads for faster assembly and reduced cross-threading risk.
• Robust material integrity from Rockwell B69 hardness steel, providing durability and wear resistance.
• Full threading along the 5-inch length offers maximum grip and adjustability in deep applications.
• Standard-compliant design meeting ASME B18.2.1 ensures interchangeability and engineering reliability.
• External hex drive design allows for high-torque installation with common tools, speeding up assembly processes.

Professional Applications & Engineering Value

This heavy-duty hex head screw is engineered for demanding applications in construction, machinery assembly, and structural frameworks where high tensile strength and corrosion resistance are critical. The 1/2"-13 UNC coarse thread provides excellent holding power in metals and other rigid materials, reducing the risk of stripping under dynamic loads. Made from steel with Rockwell B69 hardness, it withstands repetitive stress, while the zinc plating offers a protective barrier against oxidation, making it ideal for outdoor or humid environments. Fully compliant with ASME B18.2.1 standards, it ensures precise fit and long-term reliability in industrial fastening systems.

Specification Summary & Compliance

This screw features a Class 2A thread fit for standard tolerance and easy assembly, with a 1/2"-13 UNC coarse thread and right-hand threading in an inch system. It meets ASME B18.2.1 specifications under ASTM A307 and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material quality for global industrial use.