S-92360A322 1/4"-20 x 3/4" 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: Integrated nylon patch thread locker maintains secure fastening from -70° to 250°F, preventing loosening in dynamic environments.
• Exceptional strength and durability: Made from black-oxide alloy steel with a Rockwell C39 hardness and 120,000 psi tensile strength for reliable performance under high stress.
• Precise thread engagement: UNC coarse threads with Class 3A fit ensure easy installation and superior holding power in demanding applications.
• Easy installation and removal: Hex drive (5/32") allows for efficient torque application with standard tools, reducing assembly time.
• Corrosion-resistant finish: Black-oxide coating enhances durability and provides a professional appearance, extending service life.
• Versatile industrial use: Rounded button head design minimizes protrusion and distributes load evenly, ideal for tight spaces and high-vibration machinery.
• Regulatory compliance assurance: Meets ASME B18.3, ASTM F835, and MIL-DTL-18240 standards, with RoHS 3 and REACH compliance for global sourcing.

Professional Applications & Engineering Value

This 1/4"-20 x 3/4" black-oxide alloy steel rounded head screw is engineered to address critical industrial challenges such as vibration-induced loosening and mechanical fatigue. The nylon patch thread locker provides consistent locking performance across a wide temperature range (-70° to 250°F), making it ideal for automotive assemblies, heavy machinery, and electronic enclosures where thermal cycling and dynamic loads are common. The UNC coarse threads and Class 3A fit ensure rapid installation and reliable thread engagement in coarse-grained materials, reducing the risk of cross-threading. Combined with a hex drive for high-torque application, this screw delivers efficient, secure fastening in industrial applications requiring durability and resistance to environmental stressors.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise dimensional accuracy, fully threaded for maximum grip length. It complies with ASME B18.3, ASTM F835, and MIL-DTL-18240 manufacturing specifications, ensuring consistent quality and performance. Environmental and safety standards include RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free of hazardous substances and suitable for regulated industries.