S-91247A685 7/16"-14 x 4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating that protects against rust and extends service life in harsh industrial environments
• High tensile strength of 120,000 psi ensures reliable performance under heavy loads and prevents fastener failure in demanding applications
• Rockwell C25 hardness provides excellent durability and resistance to wear, maintaining structural integrity over time
• Class 2A thread fit with UNC coarse threading offers easier assembly and reduced risk of cross-threading while maintaining secure connections
• Partially threaded design allows for precise clamping force distribution and prevents joint loosening in vibration-prone applications
• External hex drive with 5/8" head width enables high-torque installation using standard tools for efficient assembly and maintenance
• Comprehensive compliance with ASME, RoHS 3, and REACH standards ensures quality assurance and environmental responsibility for global industrial use

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers exceptional engineering value through its optimized material properties and structural design. The zinc plated finish provides critical corrosion protection for outdoor equipment, machinery, and structural assemblies exposed to moisture and chemicals. With its 7/16"-14 UNC coarse thread configuration and partial threading, this fastener effectively distributes clamping forces while preventing vibration-induced loosening in heavy machinery, construction equipment, and automotive applications. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures reliable performance in high-stress environments where fastener integrity is paramount. These industrial hex screws solve common engineering challenges by offering predictable failure points, consistent torque values, and long-term reliability in demanding heavy-duty fastening scenarios.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit tolerance according to UNC standards with 7/16"-14 thread size and 4" length. Manufacturing complies with ASME B18.2.1 specifications where identified as SAE J429. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) compliance regarding Substances of Very High Concern as of January 17, 2023. The Grade 5 strength classification and Rockwell C25 hardness ensure consistent mechanical properties across production batches for reliable industrial performance.