S-91583A359 1 1/4"-7 x 6" 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 105,000 psi tensile strength for reliable performance in the most demanding structural and heavy machinery applications.
• Superior corrosion resistance provided by the hot-dipped galvanized steel coating, significantly extending service life in harsh or outdoor environments.
• High-strength Grade A325 classification ensures consistent mechanical properties and reliability for critical connections in construction and industrial frameworks.
• Optimized for easy installation and secure fit with a coarse UNC thread and Class 2A thread fit, reducing the risk of cross-threading and ensuring a tight, precise assembly.
• Robust hex head design allows for high torque application with standard tools, preventing stripping and providing a secure, vibration-resistant fastening.
• Partial threading offers an unthreaded shank for a designated grip length, providing superior clamp load and resistance to shear forces in structural joints.
• Full compliance with major industry standards including ASME, ASTM, RoHS, and REACH, guaranteeing material quality, safety, and environmental responsibility for global projects.

Professional Applications & Engineering Value

Engineered for critical structural connections, this 1 1/4"-7 UNC Grade A325 hex head screw delivers unmatched reliability in construction, bridgework, and heavy equipment manufacturing. Its hot-dipped galvanized steel construction provides a thick, durable barrier against rust and corrosion, a vital feature for outdoor or high-moisture environments. The coarse UNC thread and Class 2A fit ensure rapid assembly with a reduced risk of galling, while the partial threading and high tensile strength are specifically designed to handle dynamic loads and prevent joint failure. This fastener solves the core industrial challenge of maintaining long-term structural integrity under extreme stress and environmental exposure.

Specification Summary & Compliance

This screw adheres to Class 2A thread tolerances for a free-spinning fit and is manufactured to UNC (Unified Coarse Thread) standards. It conforms to the dimensional requirements of ASME B18.2.6 and the material and mechanical specifications of ASTM A325 and ASTM F3125. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent international regulations for hazardous substances.