S-93082A120 4-40 x 3/8" Phillips Thread-Locking Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch thread locker that maintains secure fastening in high-vibration environments
• Exceptional corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life in harsh conditions
• High-strength performance with 80,000 psi tensile strength and Rockwell B80 hardness for demanding industrial applications
• Wide temperature tolerance with thread locker effective from -70° to 250°F for reliable performance across diverse operating environments
• Precise thread engagement with Class 2A thread fit ensuring consistent installation and optimal clamping force
• Flush mounting capability with standard flat head profile and 82° countersink angle for smooth surface finishes
• Industry-standard compatibility with UNC coarse threading and Phillips drive for easy installation with common tools

Professional Applications & Engineering Value

These 4-40 UNC flat head Phillips screws with nylon patch thread locker provide engineered solutions for vibration-prone assemblies where fastener security is critical. The 18-8 stainless steel construction combined with passivated finish delivers superior corrosion resistance in demanding environments such as electronics enclosures, machinery panels, and automotive components. The coarse thread spacing ensures rapid installation while maintaining the structural integrity needed for high-stress applications. With fully threaded design and precise Class 2A thread fit, these machine screws offer consistent clamping force and reliable performance in automated assembly processes, reducing maintenance cycles and improving operational efficiency.

Specification Summary & Compliance

This fastener features 4-40 UNC coarse threading with Class 2A precision tolerance for consistent fit and performance. The manufacturing complies with industry standards for flat head machine screws, including the standard 82° countersink angle. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. Mechanical properties include 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance in demanding applications.