S-92360A107 4-40 x 3/8" ASME B18.3, ASTM F835, MIL-DTL-18240 Thread-Locking Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with nylon patch thread locker that maintains secure locking from -70° to 250°F, preventing loosening in demanding environments.
• Enhanced durability and corrosion resistance through black-oxide coating on alloy steel, extending service life in industrial settings.
• Superior strength for high-stress applications with 120,000 psi tensile strength and Rockwell C39 hardness, ensuring reliable performance under load.
• Precise and secure fastening with Class 3A thread fit and UNC coarse threading, providing excellent engagement and reduced cross-threading risks.
• Easy installation and removal using a standard 1/16" hex drive, allowing for efficient assembly with common tools.
• Versatile rounded button head design that offers a low-profile finish while distributing clamp load effectively.
• Compliance with major industry standards including ASME B18.3, ASTM F835, and MIL-DTL-18240, ensuring quality and interoperability.

Professional Applications & Engineering Value

These 4-40 UNC nylon patch locking button head screws are engineered to address critical challenges in industrial and mechanical assemblies where vibration, thermal cycling, and high stress are common. The black-oxide alloy steel construction provides excellent resistance to corrosion and wear, while the nylon patch thread locker ensures a permanent lock without the need for additional adhesives. This makes them ideal for applications in machinery, automotive systems, and electronic enclosures, where secure fastening is essential to prevent failures. The fully threaded design and coarse UNC threading enable quick installation and robust holding power, reducing maintenance downtime and improving overall system reliability in industrial environments.

Specification Summary & Compliance

This product features precise Class 3A thread fit with UNC coarse threading and a length of 3/8". It is manufactured in compliance with ASME B18.3, ASTM F835, and MIL-DTL-18240 specifications, ensuring dimensional accuracy and performance consistency. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.