S-91583A241 1"-8 x 4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel coating, ideal for outdoor and harsh industrial environments
• Exceptional load-bearing capacity with Grade A325 classification and 120,000 psi tensile strength for critical structural connections
• Enhanced durability backed by Rockwell C19 hardness, reducing wear and deformation under heavy loads
• Reliable coarse threading with 1"-8 UNC and Class 2A fit for faster assembly and reduced cross-threading risks
• Optimized grip and stability with 2 1/4" grip length and 4" overall length for secure fastening in thick materials
• Easy installation and removal using standard external hex drive tools, improving maintenance efficiency
• Compliance with major industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125 for consistent quality and safety

Professional Applications & Engineering Value

These Grade A325 heavy-duty hex head screws are engineered to address critical challenges in structural and industrial applications where high tensile strength and corrosion resistance are paramount. The hot-dipped galvanized steel construction provides a robust barrier against rust and environmental degradation, making them suitable for bridges, construction frameworks, and machinery exposed to moisture. With 1"-8 UNC coarse threading and partial threading design, they ensure secure clamping in thick assemblies while minimizing the risk of thread stripping. The external hex drive allows for high-torque installation, supporting efficient assembly in demanding scenarios like steel building erection and heavy equipment manufacturing. By meeting ASME B18.2.6 and related standards, these screws deliver reliable performance in load-bearing joints, reducing maintenance needs and enhancing project longevity.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit and 1"-8 UNC coarse threading for consistent engagement. It complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, ensuring dimensional accuracy and mechanical properties. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.