S-91571A427 3/4"-10 x 3 3/4" 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 Grade A325 classification and 120,000 psi tensile strength for reliable performance in high-stress applications
• Superior wear resistance due to Rockwell C19 hardness, ensuring extended service life under demanding conditions
• Optimized installation efficiency through UNC coarse threading and Class 2A fit, reducing assembly time while maintaining precision
• Enhanced torque transmission with external hex drive and 1 1/4" head width, providing secure fastening in heavy machinery and construction
• Controlled clamping force through partial threading design with 2 3/8" grip length, preventing joint loosening in structural connections
• Regulatory compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 standards for quality and safety in critical applications
• Environmental responsibility with RoHS 3 and REACH compliance, suitable for global industrial supply chains

Professional Applications & Engineering Value

Engineered for structural steel connections and heavy machinery assembly, these Grade A325 hex head screws address critical challenges in industrial fastening. The steel construction with Rockwell C19 hardness provides exceptional resistance to vibration-induced fatigue, while the UNC coarse threads and Class 2A fit ensure rapid installation without compromising joint integrity. The partially threaded design concentrates strength where needed most, preventing thread damage in structural members. These heavy-duty screws deliver reliable performance in bridge construction, building frameworks, and industrial equipment where 120,000 psi tensile strength is essential for safety-critical applications. The external hex drive accommodates standard tools for efficient maintenance and disassembly in confined spaces.

Specification Summary & Compliance

This 3/4"-10 hex head screw features precision Class 2A thread fit with UNC coarse threading for optimal engagement. Manufacturing conforms to ASME B18.2.6 dimensional standards and ASTM A325/ASTM F3125 material specifications. The fastener maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial markets. All dimensions adhere to inch system measurement with consistent right-hand thread direction for standardized installation procedures.