S-91735A601 4-40 x 1 1/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing performance
• Enhanced durability and longevity through passivated finish, providing an extra protective oxide layer against rust and wear
• Precise and secure fastening with Class 2A thread fit and UNC coarse threads, ensuring consistent engagement and reduced cross-threading risks
• Optimized drive efficiency using Phillips No. 1 drive style for easy installation with standard tools and minimized cam-out
• Full-length threading delivers maximum grip and holding power across the entire screw length for robust assemblies
• Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility

Professional Applications & Engineering Value

These 4-40 UNC rounded head Phillips screws in 316 stainless steel are engineered to address critical challenges in industrial and marine settings where corrosion, high stress, and regulatory compliance are paramount. The passivated finish significantly enhances the innate corrosion resistance of 316 stainless steel, making these coarse thread screws ideal for applications exposed to moisture, chemicals, and saltwater environments. The pan head design with a Phillips No. 1 drive facilitates quick and secure installation in confined spaces, while the fully threaded and Class 2A fit ensures uniform load distribution and vibration resistance. Commonly used in industrial machinery, electronic enclosures, and chemical processing equipment, these screws provide long-term reliability, reducing maintenance frequency and failure risks in demanding operational conditions.

Specification Summary & Compliance

This product adheres to precise dimensional and performance standards, including Class 2A thread fit for consistent assembly and UNC coarse threading (4-40 size) for rapid installation. Manufacturing and quality are governed by ASME B18.6.3 specifications, ensuring interchangeability and reliability. Environmental and safety compliance is confirmed through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) adherence, guaranteeing the absence of hazardous substances. Key specifications include a length of 1-1/8 inch, right-hand thread direction, and full threading for optimal performance.