S-91309A634 3/8"-16 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, extending service life in demanding industrial environments.
• High tensile strength of 60,000 PSI ensures reliable performance under heavy loads and vibration.
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation.
• Class 2A thread fit with UNC coarse threads allows for easier, faster assembly and reduced cross-threading risk.
• External hex drive and hex head design offers secure, high-torque installation with standard tools.
• Full threading along the 2 1/2" length ensures maximum grip and holding power across the entire fastener.
• Compliance with ASME B18.2.1, RoHS 3, and REACH guarantees consistent quality, safety, and environmental standards.

Professional Applications & Engineering Value

This 3/8"-16 UNC hex head screw is engineered for heavy-duty industrial applications where reliability and strength are critical. The steel material combined with zinc plating provides robust corrosion resistance, making it ideal for machinery, structural assemblies, and outdoor equipment exposed to harsh conditions. The coarse UNC thread and Class 2A fit facilitate quick installation and reduce the risk of stripping, while the external hex drive allows for high-torque tightening without slippage. With a 60,000 PSI tensile strength and full threading, it delivers secure, long-lasting fastening in construction, automotive, and manufacturing sectors, ensuring operational safety and efficiency.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit and adheres to UNC coarse thread standards with a size of 3/8"-16. It is manufactured in compliance with ASME B18.2.1 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and suitable for global industrial use.