S-92360A324 1/4"-20 x 7/8" 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 that maintains integrity across a wide temperature range from -70° to 250°F, preventing loosening in demanding applications.
• Superior strength and durability from black-oxide alloy steel with Rockwell C39 hardness and 120,000 psi tensile strength, ensuring reliable performance under high stress.
• Precise thread engagement with Class 3A UNC coarse threads and full threading, providing excellent grip and reducing the risk of cross-threading during assembly.
• Easy installation and removal thanks to the hex drive (5/32") and rounded button head design, allowing for efficient tool access in confined spaces.
• Corrosion-resistant black-oxide finish enhances surface protection, extending the screw's lifespan in harsh industrial environments.
• Compliance with major industry standards including ASME B18.3, ASTM F835, and MIL-DTL-18240, ensuring consistent quality and interoperability.
• Environmental and safety compliance with RoHS 3 and REACH regulations, making it suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

These black-oxide alloy steel rounded head screws are engineered to address common industrial challenges such as vibration-induced loosening and assembly inefficiencies. The nylon patch thread locker provides a permanent locking mechanism that withstands extreme temperature fluctuations from -70° to 250°F, ideal for machinery, automotive, and aerospace components where reliability is critical. The UNC coarse thread and Class 3A fit ensure quick, secure fastening with reduced risk of stripping, while the hex drive and rounded button head facilitate easy installation in tight spaces. Made from high-strength alloy steel, these screws offer exceptional tensile strength (120,000 psi) and hardness (Rockwell C39), making them suitable for heavy-duty applications that demand durability and long-term performance without frequent maintenance.

Specification Summary & Compliance

This screw features precise Class 3A thread fit with UNC coarse threads (1/4"-20) and full threading for consistent engagement. It complies with ASME B18.3, ASTM F835, and MIL-DTL-18240 specifications, ensuring adherence to rigorous manufacturing standards. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.