S-91221A214 4-40 x 5/16" UL 94 HB Plastic Socket Head Screws
Plastic Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior chemical resistance thanks to glass-filled nylon construction, ideal for harsh industrial environments
- Reliable thermal performance with stable operation from -20°F to 230°F, maintaining integrity in temperature-fluctuating applications
- Precise Class 2A thread fit ensures smooth assembly and secure fastening in UNC 4-40 coarse thread applications
- Durable 3/32" hex drive provides excellent torque transmission and reduces stripping risk during installation
- Lightweight and corrosion-resistant off-white plastic design eliminates rust and reduces overall component weight
- Comprehensive compliance with UL 94 HB flammability rating, RoHS 3, and REACH regulations for global market acceptance
- Fully threaded design offers consistent engagement along the entire 5/16" length for versatile mounting applications
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these glass-filled nylon socket head cap screws solve critical challenges in chemical processing, electronics, and outdoor equipment where metal fasteners would corrode or conduct electricity. The 4-40 UNC coarse thread configuration with Class 2A fit provides reliable engagement in plastic and soft material assemblies, while the standard socket head profile with 3/32" hex drive ensures secure tool engagement without cam-out. The material's inherent thermal stability (-20° to 230°F) maintains dimensional integrity in applications experiencing temperature cycling, making these fully threaded screws ideal for HVAC components, electrical enclosures, and automotive assemblies where weight reduction and chemical resistance are paramount.
Specification Summary & Compliance
These inch-system fasteners feature precise Class 2A thread fit per UNC standards with 4-40 coarse threads and right-hand thread direction. Manufacturing complies with UL 94 HB flammability requirements and demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring verified material safety and performance standards.
