S-91221A169 1/4"-20 x 1/2" UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Superior temperature resistance for reliable performance in environments ranging from -20°F to 230°F
• Excellent chemical and corrosion resistance thanks to glass-filled nylon construction, ideal for harsh industrial settings
• Secure hex drive engagement with 3/16" drive size preventing cam-out and ensuring precise torque application
• Fast installation and removal with UNC coarse threads designed for quick assembly in various materials
• Consistent thread quality with Class 2A fit ensuring reliable engagement and vibration resistance
• Regulatory compliance assurance meeting UL 94 HB flammability standards and environmental regulations (RoHS 3, REACH)
• Lightweight non-conductive properties making them ideal for electrical applications where metal fasteners can't be used

Professional Applications & Engineering Value

These glass-filled nylon socket head cap screws deliver exceptional engineering value where traditional metal fasteners fall short. The glass-reinforced nylon material provides superior strength-to-weight ratio while maintaining excellent dimensional stability across wide temperature fluctuations. The UNC coarse thread pattern ensures rapid installation in plastic, wood, and soft metal applications without stripping threads. The socket head design with hex drive allows for high torque application in confined spaces, making them perfect for electrical enclosures, machinery guards, and automotive components where corrosion resistance, electrical insulation, and weight reduction are critical. Their off-white color blends seamlessly with modern industrial equipment while the fully threaded design provides maximum holding power throughout the entire fastener length.

Specification Summary & Compliance

Manufactured to precise inch measurement standards with critical dimensions including 1/4"-20 UNC thread size, 1/2" length, and 3/8" head diameter. Threads are precision-cut to Class 2A fit standards ensuring consistent engagement and reliable performance. These screws comply with UL 94 HB flammability rating for reduced fire risk and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict material compliance.