S-92360A105 4-40 x 1/4" ASME B18.3, ASTM F835, MIL-DTL-18240 Thread-Locking Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Vibration-resistant secure fastening with permanent nylon patch thread locker that maintains integrity from -70° to 250°F
• Superior corrosion protection through black-oxide coating on alloy steel for extended service life in demanding environments
• Exceptional load-bearing capability with 120,000 psi tensile strength and Rockwell C39 hardness for high-stress applications
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring reliable installation and consistent clamping force
• Quick installation and removal using standard 1/16" hex drive for efficient assembly line operations
• Full-threaded design providing maximum thread engagement and superior holding power across the entire fastener length
• Regulatory compliance assurance meeting critical industrial and environmental standards for global supply chain integration

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 4-40 UNC rounded head screws deliver critical vibration resistance where conventional fasteners fail. The permanent nylon patch thread locker eliminates the need for secondary locking mechanisms, reducing assembly time while providing reliable performance across extreme temperature ranges (-70° to 250°F). The black-oxide alloy steel construction offers superior corrosion resistance in harsh environments, while the Class 3A thread fit ensures precise engagement in precision machinery, electronic enclosures, and automotive assemblies. The button head profile with hex drive facilitates installation in confined spaces, making these screws ideal for maintenance-critical applications where reliability and ease of service are paramount.

Specification Summary & Compliance

These rounded head screws feature precision Class 3A thread fit with 4-40 UNC coarse threading and right-hand direction. Manufacturing complies with ASME B18.3, ASTM F835, and MIL-DTL-18240 specifications, ensuring consistent quality and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, making them suitable for global industrial applications. The fully threaded design with 1/4" length provides maximum utility across various assembly requirements.