S-92949A135 5-40 x 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Superior holding power from fully threaded UNC coarse threads and Class 3A fit, ensuring reliable fastening in demanding applications.
• High tensile strength of 70,000 psi combined with Rockwell B55 hardness for durable, long-lasting performance under stress.
• Easy installation and removal with hex drive (5/64") and rounded button head design, reducing assembly time and tool slippage.
• Broad compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
• Versatile right-hand coarse threading (5-40 UNC) provides quick engagement and strong grip in various materials.
• Compact dimensions (1/2" length, 0.238" head diameter) allow for use in space-constrained assemblies without compromising strength.

Professional Applications & Engineering Value

These 5-40 UNC thread rounded head screws are engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. The 18-8 stainless steel material and passivated finish offer robust protection against rust and chemicals, making them suitable for applications in machinery, electronics, and outdoor equipment. The fully threaded coarse UNC design ensures maximum thread engagement and load distribution, reducing the risk of stripping in soft or brittle substrates. With a hex drive style and button head profile, they facilitate quick installation in tight spaces, enhancing assembly efficiency while maintaining a low-profile appearance. Ideal for B2B procurement, these screws deliver consistent performance in industrial screw applications where reliability and compliance are critical.

Specification Summary & Compliance

This product features precise Class 3A thread fit and adheres to UNC thread standards with a 5-40 size and coarse spacing. Manufacturing conforms to ASME B18.3 specifications, ensuring dimensional accuracy and interoperability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for global industrial use.