S-91583A142 5/8"-11 x 2 1/2" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength, ideal for heavy structural connections.
• Superior corrosion resistance from hot-dipped galvanized steel coating, extending service life in harsh environments.
• Reliable fastening performance with UNC coarse threads and Class 2A fit, ensuring easy installation and vibration resistance.
• High durability backed by Rockwell C19 hardness, reducing wear and deformation under stress.
• Optimized grip and thread design with 1 1/4" grip and partial threading for precise clamping force distribution.
• Industry-standard compliance including ASME B18.2.6 and ASTM A325, guaranteeing interchangeability and safety.
• Environmental and regulatory safety with RoHS 3 and REACH compliance, suitable for global industrial applications.

Professional Applications & Engineering Value

Engineered for demanding structural bolting and heavy machinery assembly, these Grade A325 hex head screws address critical challenges like joint integrity and environmental degradation. The hot-dipped galvanized steel construction provides a robust barrier against rust and chemical exposure, essential for outdoor or high-moisture settings such as construction frameworks, bridges, and industrial equipment. Featuring UNC coarse threading and a partial thread design, they facilitate quicker installation and minimize thread stripping risks, while the external hex drive allows for high-torque application with standard tools. This combination ensures long-term reliability, reduces maintenance downtime, and supports compliance with rigorous engineering standards like ASTM F3125, making them a trusted choice for professionals prioritizing safety and efficiency.

Specification Summary & Compliance

This 5/8"-11 hex head screw adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC coarse thread spacing (11 TPI). It conforms to manufacturing specifications under ASME B18.2.6, ASTM A325, and ASTM F3125, ensuring mechanical properties and performance reliability. Additionally, the product is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and health safety requirements for industrial use.