S-92360A106 4-40 x 3/16" 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 thread locker that maintains secure fastening in demanding environments
• Exceptional strength and durability with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Reliable performance across extreme temperatures from -70° to 250° F without compromising locking integrity
• Precision thread engagement with Class 3A thread fit ensuring consistent, secure connections in critical assemblies
• Easy installation and removal with 1/16" hex drive and rounded button head design for accessible tool engagement
• Corrosion-resistant protection through black-oxide finish on alloy steel for extended service life
• Full threading coverage providing maximum grip length and uniform load distribution along the entire fastener

Professional Applications & Engineering Value

These 4-40 UNC nylon patch locking screws deliver critical vibration resistance in industrial machinery, electronic enclosures, and precision equipment where loosening under dynamic loads poses significant reliability risks. The black-oxide alloy steel construction combines high tensile strength with corrosion protection, while the coarse thread design ensures rapid assembly and superior holding power in various substrates. The rounded button head with hex drive provides both aesthetic appeal and practical tool access in confined spaces. Engineered to maintain locking performance across extreme temperature fluctuations from -70° to 250°F, these fully threaded screws solve common fastening failures in automotive, aerospace, and industrial control systems where thermal cycling and vibration are constant challenges.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit tolerances with UNC coarse threading and 4-40 thread size. Complies with ASME B18.3, ASTM F835, and MIL-DTL-18240 specifications for dimensional accuracy and performance reliability. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features 3/16" length and right-hand thread direction for standardized installation procedures across industrial applications.