S-91221A111 2-56 x 3/16" 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
- Corrosion-resistant construction using glass-filled nylon plastic eliminates rust and galvanic corrosion in harsh environments
- Precise Class 2A thread fit ensures smooth installation and reliable fastening performance in industrial assemblies
- Wide temperature tolerance from -20° to 230° F maintains structural integrity across diverse operating conditions
- UL 94 HB flammability certification provides verified safety performance for electrical and industrial applications
- 5/64" hex drive socket head delivers secure tool engagement and prevents stripping during high-torque installations
- Environmental compliance with RoHS 3 and REACH regulations ensures safe use in regulated industries
- 2-56 UNC coarse threading offers rapid installation and superior resistance to vibration loosening
Professional Applications & Engineering Value
These glass-filled nylon socket head cap screws solve critical engineering challenges where metal fasteners fail. The UL 94 HB certified material provides inherent electrical insulation while resisting chemicals, moisture, and corrosion that degrade metal components. The 2-56 UNC coarse threads with Class 2A fit ensure reliable engagement in plastic and soft material assemblies without stripping threads. With a 230° F temperature rating, these fasteners maintain dimensional stability in elevated temperature environments where thermal expansion compromises other plastics. The 5/64" hex drive design prevents cam-out in high-cycle assembly operations, making them ideal for electronics enclosures, automotive components, and machinery where corrosion-resistant fasteners are essential for long-term reliability.
Specification Summary & Compliance
Manufactured to precise inch system specifications with Class 2A thread fit per UNC standards. Features fully threaded design with right-hand coarse threading and standard socket head profile. Compliant with UL 94 HB flammability standards, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) regulations for chemical safety. Temperature operating range certified from -20° to 230° F with off-white color consistency across production batches.
