S-91735A115 4-40 x 7/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 Stainless Steel construction with passivated surface treatment
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable performance under load
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized drive efficiency through Phillips No. 1 drive design providing reliable torque transmission and reduced cam-out risk
• Full-threaded design maximizing grip length and distribution for enhanced holding power across the entire 7/8" length
• Industry compliance assurance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

This 4-40 UNC machine screw delivers exceptional engineering value for industrial applications requiring corrosion-resistant fastening solutions. The combination of 316 Stainless Steel material and passivated finish provides superior protection against chemical exposure and atmospheric corrosion, making it ideal for marine, chemical processing, and food industry applications. The rounded pan head design with Phillips drive offers a low-profile installation while maintaining excellent torque transmission capabilities. With coarse threading and Class 2A thread fit, this fully threaded screw ensures rapid assembly and reliable performance in vibration-prone environments, reducing maintenance requirements and extending service life in demanding industrial settings.

Specification Summary & Compliance

This precision-engineered fastener features 4-40 UNC coarse threads with Class 2A thread fit ensuring dimensional accuracy and proper mating with corresponding nuts and threaded components. Manufactured to ASME B18.6.3 specifications for consistent quality and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) regulations restricting hazardous substances and REACH (EC 1907/2006) standards for chemical safety, making it suitable for use in regulated industries and international markets.