S-99051A950 4-40 Press-Fit Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Reliable press-fit retention designed for minimum 0.038" panel thickness, preventing loosening under vibration
• Precision coarse threading with 4-40 UNC Class 2B fit for quick assembly and consistent torque performance
• Optimized installation process using standard L drill bit (0.29" diameter), reducing setup time and tooling costs
• Round head design provides smooth surface finish and prevents snagging in automated assembly lines
• Right-hand thread orientation ensures compatibility with standard fastening equipment and procedures
• Environmental compliance with RoHS 3 standards, meeting global regulatory requirements for electronics and industrial applications

Professional Applications & Engineering Value

Engineered for high-volume panel assembly, the PEM® AC-440-1 press-fit nut solves critical vibration resistance challenges in electronics enclosures, communication equipment, and industrial control panels. The 18-8 stainless steel construction provides inherent corrosion resistance that outperforms plated steel alternatives in humid or chemically aggressive environments. The coarse UNC threading enables rapid installation while maintaining Class 2B thread fit precision for consistent clamp load distribution. The press-fit round head design creates permanent threads in thin sheet metal without requiring welding or adhesives, significantly reducing assembly time and labor costs while providing reliable thread retention that withstands repeated disassembly cycles.

Specification Summary & Compliance

This inch system fastener features precision 4-40 UNC coarse threads with Class 2B thread fit tolerance for optimal engagement with mating components. Manufactured to PEM® engineering specifications for press-fit nuts, it requires 0.29" drill bit (size L) preparation and installs permanently in panels with 0.038" minimum thickness. The product is fully RoHS 3 (2015/863/EU) compliant and meets industry standards for self-clinching fasteners in electronic and industrial applications.