S-93310A339 3/8"-16 x 1/2" ASME B18.3, ASTM F879, MIL-DTL-18240 Thread-Locking Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch ensures secure fastening in high-stress environments, preventing loosening under dynamic loads.
• Superior corrosion resistance from 18-8 Stainless Steel construction extends service life in harsh or outdoor industrial settings.
• High tensile strength of 70,000 psi provides reliable performance under heavy mechanical stress, reducing risk of fastener failure.
• Wide temperature tolerance (-70° to 250°F) allows consistent operation in extreme thermal conditions without compromising locking integrity.
• Precise Class 3A thread fit ensures smooth installation and optimal engagement with mating components, minimizing assembly time.
• Hex drive compatibility offers easy installation with standard tools, enhancing efficiency in maintenance and production lines.
• Rounded button head design reduces snagging risks and provides a low-profile finish for improved safety and aesthetics.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these nylon patch locking screws address critical vibration-induced loosening in machinery, automotive assemblies, and heavy equipment. The 18-8 Stainless Steel material delivers excellent corrosion resistance, ideal for outdoor or chemically exposed applications. With coarse UNC threads and Class 3A fit, installation is swift and reliable, reducing downtime. The hex drive ensures high torque transmission without slippage, while the rounded head minimizes protrusion in confined spaces. This combination of locking technology and durable construction provides long-term reliability in aerospace, manufacturing, and transportation sectors where fastener failure is not an option.

Specification Summary & Compliance

This screw features 3/8"-16 UNC coarse threads with Class 3A precision fit for consistent performance. It meets ASME B18.3, ASTM F879, and MIL-DTL-18240 manufacturing standards, ensuring dimensional accuracy and reliability. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, adhering to environmental and safety regulations for global industrial use.