S-91221A174 2-56 x 1/2" UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Enhanced durability with glass-filled nylon construction that withstands mechanical stress and resists corrosion in demanding environments.
• Reliable temperature performance from -20° to 230°F, ensuring stable operation in varied thermal conditions without degradation.
• Precise Class 2A thread fit for smooth assembly and secure fastening, reducing the risk of cross-threading and improving joint integrity.
• Standard hex drive compatibility with 5/64" drive size for easy installation using common tools, speeding up assembly processes.
• Full threading along the 1/2" length provides consistent grip and adjustability, ideal for applications requiring uniform clamping force.
• Compliance with UL 94 HB, RoHS 3, and REACH standards ensures safety, environmental responsibility, and suitability for regulated industries.
• Coarse UNC thread design offers quick engagement and high resistance to vibration loosening in industrial settings.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these glass-filled nylon socket head cap screws deliver exceptional strength and chemical resistance, making them ideal for electronics, automotive, and machinery assemblies where metal fasteners may cause galvanic corrosion or electrical interference. The right-hand UNC coarse threads with Class 2A fit ensure rapid, reliable installation, reducing assembly time and minimizing the risk of thread damage. With a temperature range of -20° to 230°F, they perform consistently in environments subject to thermal cycling, while the black color and socket head design provide a low-profile, professional finish. This combination of material properties and precise engineering addresses common pain points like weight reduction, insulation needs, and compliance with strict industry regulations, enhancing overall system reliability.

Specification Summary & Compliance

This socket head cap screw adheres to inch system measurements with a thread size of 2-56 UNC, Class 2A thread fit for standard tolerance, and coarse thread spacing to ensure compatibility with common components. It meets UL 94 HB for flammability resistance, is RoHS 3 (2015/863/EU) Compliant to restrict hazardous substances, and complies with REACH (EC 1907/2006) for safe chemical management, supporting use in regulated and high-performance applications.