S-91583A172 3/4"-10 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

• Superior corrosion protection with hot-dipped galvanized steel coating for extended service life in harsh environments
• Exceptional structural integrity with Grade A325 rating and 120,000 psi tensile strength for heavy-load applications
• Precision thread engagement with Class 2A fit and UNC coarse threads for reliable installation and vibration resistance
• Optimized load distribution through partially threaded design with 1 1/8" grip length for structural connections
• Enhanced installation efficiency with external hex drive and 1 1/4" head width for secure tool engagement
• Consistent performance with Rockwell C19 hardness ensuring dimensional stability under stress
• Regulatory compliance assurance meeting international environmental and safety standards

Professional Applications & Engineering Value

These Grade A325 hex head structural screws deliver critical performance where structural integrity cannot be compromised. The hot-dipped galvanized steel construction provides superior corrosion resistance for outdoor construction, industrial facilities, and infrastructure projects exposed to environmental elements. The 3/4"-10 UNC coarse thread configuration ensures rapid installation while maintaining holding power in structural steel connections. With partial threading and optimized grip length, these fasteners concentrate thread engagement where it matters most, preventing joint slippage in critical structural applications. The combination of 120,000 psi tensile strength and Rockwell C19 hardness ensures these screws maintain clamp force under dynamic loads and vibration, making them ideal for steel framing, bridge construction, and heavy machinery assembly where reliability is paramount.

Specification Summary & Compliance

This structural screw features precision Class 2A thread fit with 3/4"-10 UNC coarse threads and right-hand thread direction. Manufacturing complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural fasteners. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Dimensions include 2 1/2" length with 1 3/8" thread length and 1 1/4" hex head width for standardized installation requirements.