S-91583A331 1 1/4"-7 x 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 structural integrity with 105,000 psi tensile strength and Rockwell C19 hardness for reliable performance in heavy-load applications
• Superior corrosion protection through hot-dipped galvanized steel construction, extending service life in harsh environments
• Optimized load distribution with 2" grip length and partially threaded design for enhanced joint stability
• Precise thread engagement with Class 2A fit and UNC coarse threads ensuring consistent installation and vibration resistance
• Industry-standard compliance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for guaranteed quality
• Efficient installation with external hex drive and 2" head width providing superior torque transmission
• Environmental responsibility through RoHS 3 and REACH compliance for sustainable industrial use

Professional Applications & Engineering Value

These Grade A325 hex head screws deliver critical engineering solutions for structural connections requiring high tensile strength and corrosion resistance. The hot-dipped galvanized steel construction provides exceptional protection against environmental degradation, making them ideal for construction fasteners, bridgework, and industrial machinery where exposure to moisture and chemicals is common. The partially threaded design with 2" grip length concentrates thread engagement where needed most, preventing joint slippage under dynamic loads. With 1 1/4"-7 UNC coarse threads and Class 2A thread fit, these heavy-duty hex bolts ensure rapid installation and maintain clamping force in structural applications subject to vibration and thermal cycling.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (1 1/4"-7). Complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features 4" length with 2" thread length and external hex drive for standardized installation procedures.