S-93082A130 4-40 x 1/2" Phillips Thread-Locking Flat Head Screws

Key Features & Benefits at a Glance

• Permanent vibration-resistant locking with nylon patch thread locker that maintains secure fastening even under dynamic loads
• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated surface treatment
• High-strength performance with 80,000 psi tensile strength and Rockwell B80 hardness for demanding applications
• Reliable installation with Phillips #1 drive that prevents cam-out and ensures proper torque application
• Wide temperature compatibility with thread locker effective from -70° to 250°F for extreme environment applications
• Precise flush mounting with standard 82° countersink angle and flat head design for smooth surface finishing
• Consistent thread engagement with Class 2A thread fit and UNC coarse threading for easy assembly and disassembly

Professional Applications & Engineering Value

These 4-40 UNC nylon patch locking flat head screws provide critical vibration resistance in industrial equipment, electronic enclosures, and machinery where loosening under operational stress compromises safety and performance. The 18-8 stainless steel material combined with passivated finish delivers exceptional corrosion protection in harsh environments, while the nylon patch thread locker creates a permanent mechanical bond that eliminates the need for additional locking hardware. The fully threaded design with coarse UNC threading ensures maximum thread engagement in various materials, and the 82° countersink angle allows for flush mounting in precision applications. These Phillips flat head screws are engineered to maintain integrity across extreme temperature ranges from -70° to 250°F, making them ideal for automotive, aerospace, and industrial manufacturing applications where reliability is paramount.

Specification Summary & Compliance

This 1/2" flat head screw features Class 2A thread fit tolerance with UNC coarse threading (4-40 thread size) and standard 82° countersink angle. Manufactured from 18-8 stainless steel with passivated finish and fully threaded design. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries and international markets.