S-92360A299 1/4"-20 x 5/16" 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 ensures reliable fastening in high-stress environments, eliminating the need for separate locking washers
• Exceptional durability from black-oxide alloy steel construction providing superior corrosion resistance and extended service life in industrial conditions
• High-strength performance with 120,000 psi tensile strength and Rockwell C39 hardness withstands heavy loads and mechanical stress
• Secure installation through hex drive design enables high torque application and prevents stripping in demanding assembly operations
• Wide temperature tolerance from -70° to 250°F maintains locking integrity across extreme environmental conditions
• Precise thread engagement with Class 3A fit and UNC coarse threading ensures consistent, reliable connections in manufacturing applications
• Rounded button head profile provides a finished appearance while reducing surface damage risks in assembled products

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide alloy steel screws combine permanent nylon patch locking technology with high-strength performance to solve critical vibration-related fastening challenges. The fully threaded UNC coarse pattern with Class 3A precision fit ensures rapid assembly and reliable connections in machinery, equipment manufacturing, and automotive applications where vibration loosening compromises safety and performance. The hex drive design accommodates high torque requirements while the rounded head profile minimizes protrusion and damage to surrounding components. With temperature stability from -70° to 250°F, these locking screws maintain integrity in environments experiencing thermal cycling, making them ideal for outdoor equipment, industrial machinery, and transportation applications where reliable fastening is non-negotiable.

Specification Summary & Compliance

This 1/4"-20 UNC screw features Class 3A thread fit precision and fully threaded coarse spacing for optimal engagement. Manufacturing complies with ASME B18.3, ASTM F835, and MIL-DTL-18240 specifications, ensuring consistent quality and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components.