S-91772A115 4-40 x 1" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments.
• High tensile strength of 70,000 psi provides exceptional load-bearing capacity and resistance to mechanical stress.
• Rockwell B70 hardness offers excellent durability and wear resistance for repeated assembly and disassembly.
• Class 2A thread fit with UNC coarse threading ensures easy installation, secure fastening, and reduced cross-threading risks.
• Fully threaded design maximizes grip and holding power across the entire 1" length for consistent performance.
• Phillips drive (No. 1 size) allows for efficient, tool-compatible installation with common industrial drivers.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety regulations.

Professional Applications & Engineering Value

These 4-40 UNC pan head screws are engineered to address critical industrial fastening challenges, particularly where corrosion resistance and mechanical integrity are paramount. The passivated 18-8 stainless steel material effectively combats oxidation and chemical exposure, making these rounded head screws ideal for electronics enclosures, machinery assemblies, and outdoor equipment. The coarse thread and Class 2A fit facilitate quick, reliable installation in various substrates, reducing assembly time while maintaining high tensile strength. With a Phillips drive for compatibility with standard tools, these screws deliver consistent performance in automated or manual production lines, ensuring secure fastening in industrial applications that demand durability and regulatory compliance.

Specification Summary & Compliance

This product adheres to Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy and interchangeability. Manufacturing and quality are governed by ASME B18.6.3 specifications, while environmental and safety compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006). The screws feature a 1" length, fully threaded coarse (UNC) design, and are made from passivated 18-8 stainless steel with verified mechanical properties including 70,000 psi tensile strength and Rockwell B70 hardness.