S-91583A127 1/2"-13 x 3" 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 Grade A325 classification and 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion protection through hot-dipped galvanized steel construction, extending service life in harsh environments
• Optimized thread engagement with UNC coarse threads and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced installation efficiency featuring external hex drive and 7/8" head width for easy tool access and high torque application
• Versatile partial threading design with 1" thread length and 2" grip length providing precise clamping force distribution
• Industry compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for guaranteed quality
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe, sustainable industrial use

Professional Applications & Engineering Value

Engineered for structural bolting applications where failure is not an option, this Grade A325 hex head screw delivers critical performance advantages. The hot-dipped galvanized steel construction provides a sacrificial zinc coating that offers superior protection against corrosion in outdoor, marine, and industrial environments. With Rockwell C19 hardness and 120,000 psi tensile strength, this fastener maintains integrity under extreme loads and vibration. The UNC coarse thread configuration ensures rapid installation and reliable performance in structural steel connections, bridge construction, and heavy equipment assembly. The partially threaded design with precise 2" grip length allows for proper clamp load distribution, preventing joint relaxation and maintaining structural stability over time.

Specification Summary & Compliance

This 1/2"-13 hex head screw features Class 2A thread fit per UNC standards, ensuring proper clearance and engagement. Manufacturing complies with ASME B18.2.6 dimensional specifications, ASTM A325 material requirements, and ASTM F3125 performance standards. The fastener is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant as of January 17, 2023, meeting current environmental regulations for industrial components. Dimensions include 3" overall length, 7/8" head width, and 5/16" head height for standardized tool compatibility.