S-91221A185 1/4"-20 x 1" UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Enhanced durability and strength with glass-filled nylon construction, ideal for demanding industrial environments.
• Reliable performance across wide temperature ranges, operating from -20°F to 230°F without degradation.
• Secure and precise installation thanks to the 3/16" hex drive and standard socket head profile for easy torque application.
• Consistent thread engagement with UNC coarse threads and Class 2A fit, ensuring smooth assembly and reduced cross-threading risks.
• Full thread coverage along the 1" length provides maximum grip and adjustability in various applications.
• Compliance with safety and environmental standards, including UL 94 HB flammability rating, RoHS 3, and REACH, for worry-free usage.
• Corrosion-resistant black finish maintains appearance and function in harsh conditions without additional coatings.

Professional Applications & Engineering Value

This glass-filled nylon plastic socket head cap screw delivers exceptional value in engineering by addressing common industrial challenges such as corrosion, electrical insulation, and weight reduction. Its 1/4"-20 UNC coarse thread and Class 2A thread fit ensure reliable fastening in assemblies requiring repeated adjustments, while the right-hand thread direction and fully threaded design enhance load distribution. Ideal for applications in electronics, automotive, and machinery, this screw operates seamlessly in temperatures from -20°F to 230°F, providing stability where metal fasteners may fail due to thermal expansion or conductivity issues. The 3/16" hex drive allows for efficient installation with standard tools, reducing assembly time and improving productivity in high-volume settings.

Specification Summary & Compliance

This socket head cap screw adheres to precise inch system measurements, with a 1/4"-20 UNC thread size and Class 2A thread fit for consistent dimensional accuracy. It meets UL 94 HB specifications for flammability resistance, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance in global markets.