S-93082A110 4-40 x 1/4" Phillips Thread-Locking Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant performance with permanent nylon patch thread locker that prevents loosening under dynamic loads
• Exceptional corrosion resistance from 18-8 stainless steel construction with passivated finish for harsh environments
• Reliable high-strength fastening with 80,000 psi tensile strength and Rockwell B80 hardness for demanding applications
• Wide temperature compatibility with nylon patch effective from -70° to 250°F for diverse operating conditions
• Precise flush installation with standard 82° countersink angle and flat head design for smooth surface finishing
• Optimized thread engagement through UNC coarse threading and Class 2A fit for secure assembly
• Full-length threading provides maximum grip along the entire 1/4" length for superior holding power

Professional Applications & Engineering Value

These 4-40 UNC flat head screws deliver critical vibration resistance in industrial equipment, electronics, and machinery where secure fastening is paramount. The 18-8 stainless steel material with passivated finish ensures long-term corrosion protection in challenging environments, while the permanent nylon patch thread locker maintains clamp force without requiring additional locking components. The flat head design with 82° countersink angle allows for flush mounting in precision assemblies, and the UNC coarse threads provide rapid installation with reduced cross-threading risk. Engineered for industrial fasteners requiring reliable performance under thermal cycling and dynamic stresses.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit standards with UNC coarse threading (4-40 size) and full threading along the 1/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety. Features standard 82° countersink angle and Phillips No. 1 drive for consistent installation.