S-91221A172 2-56 x 1/4" 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
- Exceptional chemical resistance from glass-filled nylon construction, ideal for harsh industrial environments
- Reliable thermal performance with stable operation from -20° to 230°F (-29° to 110°C)
- Precise Class 2A thread fit ensures consistent engagement and vibration resistance in assemblies
- Standard hex drive compatibility with 5/64" tools for secure installation and removal
- UL 94 HB flammability certification provides safety assurance for electrical and mechanical applications
- Full regulatory compliance with RoHS 3 and REACH standards for global market acceptance
- Corrosion-free performance in environments where metal fasteners would degrade
Professional Applications & Engineering Value
Engineered for demanding applications where chemical resistance and thermal stability are critical, these glass-filled nylon socket head cap screws solve common industrial challenges. The 2-56 UNC coarse threads with Class 2A fit provide reliable fastening in plastic assemblies, electronic enclosures, and machinery where galvanic corrosion or electrical conductivity concerns eliminate metal fasteners. The black glass-filled nylon material maintains dimensional stability across the -20° to 230°F temperature range, preventing loosening due to thermal expansion differences. These fully threaded screws with 5/64" hex drive are particularly valuable in chemical processing equipment, food handling machinery, and electrical applications where non-conductive, non-magnetic properties are essential.
Specification Summary & Compliance
This socket head cap screw features 2-56 UNC coarse threads with Class 2A thread fit per ASME B1.1 standards, ensuring precise dimensional accuracy. The 1/4" length and right-hand thread direction follow inch system specifications. Manufacturing complies with UL 94 HB flammability requirements and maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making these components suitable for global industrial applications requiring verified material safety and performance standards.
