S-95373A221 5/8"-11 x 3" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance through hot-dipped galvanized finish, ensuring long-term reliability in harsh industrial environments
• High tensile strength of 60,000 psi provides reliable performance in demanding structural and heavy machinery applications
• Rockwell B69 hardness rating delivers superior durability and resistance to deformation under heavy loads
• Class 2A thread fit with UNC coarse threading enables quick assembly and secure fastening in various materials
• Partially threaded design allows for precise clamping force control and vibration resistance in critical joints
• External hex drive with 15/16" head width provides excellent torque transmission and easy installation with standard tools
• Comprehensive regulatory compliance ensures material safety and environmental responsibility across global markets

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 5/8"-11 UNC hex head screws deliver exceptional performance in structural steel connections, machinery assembly, and construction projects. The hot-dipped galvanized finish provides superior protection against corrosion, making them ideal for outdoor applications and harsh environments where moisture and chemical exposure are concerns. The coarse UNC threading ensures reliable engagement in various materials, while the partial threading design allows for optimal clamp load distribution. With 60,000 psi tensile strength and Rockwell B69 hardness, these steel fasteners maintain integrity under extreme mechanical stress, vibration, and thermal cycling conditions common in industrial settings.

Specification Summary & Compliance

This 3" hex head screw features 5/8"-11 UNC coarse threads with Class 2A thread fit tolerance for reliable engagement. Manufactured to ASME B18.2.1 specifications and ASTM A307 material standards, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, meeting the latest environmental and health protection standards for industrial components.