S-91583A629 1"-8 x 3 1/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with hot-dipped galvanized steel coating, ensuring longevity in harsh industrial environments.
• High tensile strength of 120,000 PSI provides reliable performance in heavy-duty structural and construction applications.
• Class 2A thread fit with UNC coarse threading allows for quick assembly and reduced risk of cross-threading in field conditions.
• Partial threading with 1 1/2" grip length offers superior clamping force distribution for secure structural connections.
• External hex drive design enables easy installation and removal with standard tools, improving maintenance efficiency.
• Compliance with ASME B18.2.6, ASTM A325, and ASTM F3125 guarantees consistent quality and interoperability in regulated projects.
• Rockwell C19 hardness ensures durability and resistance to deformation under high stress loads.

Professional Applications & Engineering Value

This Grade A325 hex head screw is engineered for demanding structural steel connections, bridge construction, and heavy machinery assembly where failure is not an option. The hot-dipped galvanized steel material provides a robust barrier against rust and chemical exposure, significantly extending service life in outdoor or corrosive environments. The 1"-8 UNC coarse thread design facilitates faster installation in thick materials, reducing labor time while maintaining Class 2A thread fit precision for vibration resistance. With partial threading optimizing load distribution, these screws prevent joint loosening in dynamic applications, making them ideal for seismic zones and high-stress frameworks. Their compliance with ASTM A325 and ASME B18.2.6 standards ensures they meet rigorous engineering specifications for structural integrity.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit tolerances per UNC standards, with a thread size of 1"-8 and coarse spacing for reliable engagement. Manufacturing adheres to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, ensuring dimensional consistency and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for safe use in global markets.