S-91309A593 5/16"-18 x 2 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating that protects against environmental degradation in industrial settings
• High tensile strength of 60,000 psi ensures reliable performance in demanding applications without failure
• Rockwell B69 hardness provides excellent durability and resistance to wear during installation and use
• Class 2A thread fit offers consistent, easy assembly with reduced risk of cross-threading or seizing
• Coarse UNC threads enable quick installation and strong holding power in various materials
• Fully threaded design maximizes grip length and load distribution for secure fastening
• External hex drive allows for high-torque application with standard tools, improving efficiency

Professional Applications & Engineering Value

Engineered from high-strength steel and finished with zinc plating, these 5/16"-18 UNC hex head screws address critical industrial challenges such as vibration loosening and corrosion in harsh environments. The coarse thread design ensures rapid installation in structural assemblies, machinery, and heavy-duty equipment, reducing labor time while maintaining 60,000 psi tensile strength. Ideal for construction, automotive, and manufacturing sectors, these fully threaded screws with external hex drive provide consistent clamping force and comply with ASME B18.2.1 standards, ensuring reliability in high-stress applications where precision and durability are paramount.

Specification Summary & Compliance

This product features precise Class 2A thread fit per UNC standards, with dimensions including 5/16"-18 thread size and 2-1/2" length. Manufactured in accordance with ASME B18.2.1 and ASTM A307 specifications, it ensures consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in global supply chains.