S-91205A626 3/8"-16 x 1 1/4" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional vibration resistance with a built-in nylon patch thread locker, preventing loosening under dynamic loads in temperatures from -70° to 250°F.
• Superior corrosion protection from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• High tensile strength of 170,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Precise Class 3A thread fit for easy assembly and a secure, tight connection, minimizing play and improving joint integrity.
• Optimal hardness (Rockwell C37) provides excellent wear resistance and durability, maintaining fastener performance over time.
• Standard hex drive (5/16") allows for easy installation and removal with common tools, streamlining maintenance and assembly processes.
• Fully threaded design offers consistent clamping force along the entire length, ideal for applications requiring uniform load distribution.

Professional Applications & Engineering Value

This 3/8"-16 UNC Socket Head Cap Screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion. The black-oxide alloy steel construction provides a robust barrier against rust, making it suitable for machinery, automotive, and outdoor equipment exposed to moisture. The integrated nylon patch thread locker ensures reliable fastening in high-vibration environments, from motor mounts to conveyor systems, by maintaining clamp load without the need for additional locking devices. With its coarse UNC thread and Class 3A fit, it facilitates quick assembly while delivering high strength for heavy-duty applications, reducing downtime and enhancing operational safety. This screw is ideal for engineers seeking a durable, compliant solution that meets rigorous performance standards.

Specification Summary & Compliance

This socket head cap screw features a 3/8"-16 UNC coarse thread with a Class 3A thread fit for precise dimensional accuracy. It is manufactured in accordance with ASME B18.3 and ASTM A574 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use.