S-92360A310 1/4"-20 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

• Superior vibration resistance with the integrated Nylon Patch thread locker, ensuring fasteners stay securely in place even under dynamic loads.
• Exceptional durability and corrosion resistance provided by the Black-Oxide finish on Alloy Steel, extending service life in harsh industrial environments.
• High tensile strength of 120,000 psi and Rockwell C39 hardness for reliable performance in high-stress applications.
• Wide operational temperature range from -70° to 250°F, maintaining locking integrity across diverse climatic conditions.
• Precise Class 3A thread fit for smooth assembly and superior engagement, reducing the risk of cross-threading.
• Convenient 5/32" hex drive and rounded button head design for easy installation and a low-profile, finished appearance.
• Fully threaded 1/4"-20 UNC coarse thread design offers maximum grip and holding power in a wide range of materials.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Rounded Head Hex Screw is engineered to solve critical challenges in industrial assembly where vibration loosening is a primary concern. The Nylon Patch thread locker is permanently applied, creating a prevailing torque that resists back-out, making it ideal for machinery, automotive subsystems, and electronic enclosures subjected to constant motion. The coarse UNC thread and Class 3A fit ensure rapid, reliable installation into a variety of substrates, from steel to aluminum, reducing assembly time and improving production line efficiency. The combination of high tensile strength and a robust Black-Oxide surface treatment provides long-term reliability, preventing failure in demanding applications and minimizing maintenance downtime.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a precision Class 3A thread fit and is fully threaded. It is manufactured in compliance with ASME B18.3, ASTM F835, and MIL-DTL-18240 specifications, ensuring dimensional accuracy and performance reliability. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent international regulations for hazardous substances.