S-91221A151 8-32 x 5/8" ASME B18.3, UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 17,000 psi ensures reliable fastening in demanding applications, reducing the risk of failure under load.
• Glass-filled nylon construction provides excellent durability and resistance to corrosion, making it ideal for harsh environments without metal alternatives.
• Wide temperature range from -40° to 200° F allows consistent performance in varied thermal conditions, minimizing material degradation.
• Class 2A thread fit with UNC coarse threading offers easy assembly and secure engagement, speeding up installation and reducing labor costs.
• Hex socket drive (9/64") enables precise torque application and access in confined spaces, enhancing installation efficiency.
• Compliance with ASME B18.3, RoHS 3, and REACH standards ensures product reliability and environmental safety, meeting industry regulations for global use.
• Fully threaded design maximizes grip and adjustability, providing uniform clamping force across the entire length.

Professional Applications & Engineering Value

These glass-filled nylon socket head cap screws are engineered to address common industrial challenges, such as corrosion in chemical or moisture-rich settings where metal fasteners fail. The 8-32 UNC thread with coarse spacing ensures quick, secure fastening in plastics and soft materials, reducing stripping risks. With a tensile strength of 17,000 psi and temperature resilience from -40° to 200°F, they excel in electrical enclosures, automotive assemblies, and food processing equipment, providing lightweight, non-conductive alternatives that comply with ASME B18.3 specifications. The black color and standard socket head profile further aid in aesthetic integration and tool compatibility, streamlining maintenance in industrial plastic fastener systems.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UNC coarse thread spacing per common inch-system requirements. It meets ASME B18.3 manufacturing specifications for socket head cap screws, ensuring reliability in mechanical assemblies. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting sustainable procurement practices.