S-91772A124 5-40 x 1/4" 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 and extended service life.
• High tensile strength of 70,000 psi ensures reliable fastening under demanding loads, reducing the risk of mechanical failure.
• Rockwell B70 hardness provides excellent wear resistance and durability, minimizing deformation during installation and use.
• Class 2A thread fit with UNC coarse spacing allows for quick, easy assembly and disassembly while maintaining secure connections.
• No. 2 Phillips drive and rounded pan head design offers efficient torque application and a low-profile finish for streamlined installations.
• Full threading along the 1/4" length maximizes grip and load distribution across the entire fastener for enhanced joint integrity.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for safe, global use.

Professional Applications & Engineering Value

This 5-40 UNC machine screw is engineered to address common industrial challenges such as corrosion-induced degradation and vibration loosening. The passivated 18-8 stainless steel material provides a robust barrier against moisture and chemicals, making it suitable for applications in electronics, automotive assemblies, and outdoor equipment where environmental exposure is a concern. The coarse thread spacing and Class 2A fit ensure rapid installation with standard tools, reducing assembly time while maintaining precise alignment. With a rounded pan head and Phillips drive, it delivers consistent clamping force without protruding, ideal for compact designs. These features collectively enhance reliability in industrial screws used in machinery, enclosures, and structural frameworks, where durability and compliance are critical.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications, with precise Class 2A thread fit and UNC coarse threading for consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use. Dimensions include a 1/4" length, 0.125" thread diameter, and standard inch measurements, providing reliable interchangeability and fit in various applications.