S-91772A107 4-40 x 5/16" 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 for long-lasting performance in harsh environments
• Excellent mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing capabilities
• Precision thread engagement with Class 2A thread fit ensuring consistent fastening and vibration resistance
• Optimized drive efficiency featuring Phillips No. 1 drive for secure installation and reduced cam-out risk
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

These 4-40 UNC rounded pan head Phillips screws deliver exceptional engineering value through their passivated 18-8 stainless steel composition, which provides superior corrosion resistance critical for industrial environments exposed to moisture, chemicals, and temperature variations. The coarse thread design ensures rapid installation and secure fastening in various materials, while the Class 2A thread fit maintains precise tolerances for vibration-resistant assemblies. The pan head profile with Phillips No. 1 drive offers optimal torque transmission and flush mounting capabilities, making these fully threaded screws ideal for electronics enclosures, machinery components, and automotive applications where reliability and regulatory compliance are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 standards with Class 2A thread fit precision, these 4-40 UNC screws maintain dimensional accuracy across all critical parameters. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet current industry requirements for hazardous substance restrictions. The combination of 70,000 psi tensile strength and Rockwell B70 hardness guarantees mechanical performance consistency across production batches.