S-91583A621 3/4"-10 x 5 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 structural integrity with 120,000 psi tensile strength and Rockwell C19 hardness for reliable performance in demanding applications
• Superior corrosion protection through hot-dipped galvanized steel construction, ensuring long-term durability in harsh environments
• Optimized load distribution with partial threading design that provides maximum grip length for secure structural connections
• Precise thread engagement with Class 2A UNC coarse threads ensuring consistent installation and reliable fastening performance
• Easy installation and removal featuring external hex drive and standard 1 1/4" head width for compatibility with common tools
• Industry compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural applications
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use across industrial sectors

Professional Applications & Engineering Value

These Grade A325 hex head screws deliver critical engineering solutions for structural steel connections, bridge construction, and heavy machinery assembly. The hot-dipped galvanized steel construction provides exceptional corrosion resistance that withstands environmental exposure, while the 3/4"-10 UNC coarse thread configuration ensures rapid installation and superior vibration resistance. The partially threaded design concentrates strength where needed most, preventing joint failure in high-stress applications. With 120,000 psi tensile strength and precise Class 2A thread fit, these industrial fasteners maintain structural integrity under extreme loads, making them ideal for construction projects, infrastructure development, and manufacturing equipment requiring dependable, high-strength connections.

Specification Summary & Compliance

This 3/4"-10 hex head screw features precise Class 2A thread fit with UNC coarse threading and 5 1/2" overall length. Manufactured to exacting standards including ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting applications. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors while maintaining the high-performance characteristics required for critical structural connections.