S-91221A129 3/8"-16 x 1" ASME B18.3, UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with glass-filled nylon construction, eliminating rust and galvanic compatibility issues in harsh environments
• High tensile strength of 17,000 psi provides reliable fastening performance comparable to metal alternatives in many industrial applications
• Wide temperature tolerance from -40° to 200°F ensures consistent performance across diverse operating conditions
• Precise Class 2A thread fit delivers smooth installation and secure fastening with standard UNC coarse threading
• Standard hex drive compatibility with 5/16" drive size enables easy installation using common industrial tools
• Comprehensive regulatory compliance including ASME B18.3 standards and environmental regulations for global applications
• Lightweight electrical insulation properties of nylon plastic prevent electrical conductivity where isolation is critical

Professional Applications & Engineering Value

These glass-filled nylon socket head cap screws solve critical engineering challenges where metal fasteners fall short. The off-white nylon plastic construction provides inherent corrosion resistance, making them ideal for chemical processing, marine, and food-grade applications where moisture and corrosive agents degrade metal components. The 3/8"-16 UNC coarse thread design ensures rapid installation and reliable holding power in plastic assemblies, electronic enclosures, and composite materials. With 17,000 psi tensile strength and temperature resistance from -40° to 200°F, these fasteners maintain structural integrity in demanding environments while providing electrical insulation. The standard hex drive compatibility ensures seamless integration into existing assembly processes without requiring specialized tooling.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (3/8"-16) and manufactured in accordance with ASME B18.3 specifications. These socket head cap screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. The inch system measurements ensure compatibility with North American industrial standards and specifications.