S-91772A349 4-40 x 5/32" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable, long-term fastening
• Optimized drive engagement featuring No. 1 Phillips drive for efficient installation and reduced cam-out risk
• Precision thread fit with Class 2A UNC coarse threads ensuring secure mating and vibration resistance
• Full threading design provides maximum grip length and uniform stress distribution across applications
• Standard-compliant manufacturing meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH, ensuring safe use in regulated industries

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 4-40 UNC pan head machine screws deliver critical performance advantages where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for electronics enclosures, machinery assemblies, and outdoor equipment. The combination of coarse UNC threading and Class 2A fit ensures rapid installation and secure fastening in materials where fine threads might strip or fail. With fully threaded design and 70,000 psi tensile strength, these screws maintain clamping force under vibration and thermal cycling, solving common loosening issues in dynamic environments. The standardized pan head profile and No. 1 Phillips drive facilitate efficient assembly while maintaining a low-profile appearance.

Specification Summary & Compliance

This machine screw features precision 4-40 UNC coarse threads with Class 2A fit tolerances per ASME B18.6.3 specifications. Manufacturing complies with ASME B18.6.3 standards for dimensional consistency and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restriction of hazardous substances. The right-hand threaded design with fully threaded configuration provides uniform engagement across the entire screw length.