S-92360A329 1/4"-20 x 1 1/2" ASME B18.3, ASTM F835, MIL-DTL-18240 Thread-Locking Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch to prevent loosening under dynamic loads, ensuring long-term assembly integrity
• Exceptional strength and durability from alloy steel construction, supporting 120,000 psi tensile strength for demanding applications
• Reliable performance across temperatures from -70°F to 250°F, maintaining locking function in varied operating environments
• Precise Class 3A thread fit for secure, easy engagement and reduced risk of cross-threading during installation
• Low-profile rounded button head design provides a finished appearance and minimizes protrusion in tight spaces
• Corrosion-resistant black-oxide finish enhances surface protection while allowing for consistent torque application
• 5/32" hex drive compatibility enables efficient installation with standard tools, reducing assembly time

Professional Applications & Engineering Value

This black-oxide alloy steel button head screw is engineered to address critical challenges in industrial assembly, where vibration resistance and mechanical reliability are paramount. The nylon patch locking feature eliminates the need for separate locking washers or adhesives, providing a permanent thread-locking solution that withstands shock and cyclic loading in machinery, automotive subsystems, and heavy equipment. Its fully threaded UNC coarse thread design ensures maximum grip length and pull-out strength, while the rounded head profile reduces stress concentration points. Ideal for applications requiring repeated disassembly and reassembly, this fastener maintains consistent clamping force and prevents back-off in high-vibration environments such as engine components, conveyor systems, and structural frameworks.

Specification Summary & Compliance

Manufactured to Class 3A thread tolerances for precise fit, this screw meets ASME B18.3, ASTM F835, and MIL-DTL-18240 specifications, ensuring dimensional accuracy and performance consistency. The UNC 1/4"-20 coarse thread and right-hand threading comply with industry standards for interchangeability. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing adherence to environmental and safety requirements for global industrial use.