S-91221A175 4-40 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 strength-to-weight ratio from glass-filled nylon construction, providing reliable fastening without metal corrosion risks
- Wide temperature tolerance (-20° to 230° F) ensures consistent performance across diverse operating environments
- Precision Class 2A thread fit delivers secure engagement and vibration resistance in assembly applications
- Standard hex drive compatibility with 3/32" tools enables quick installation and removal in confined spaces
- Comprehensive regulatory compliance including UL 94 HB flammability rating and RoHS 3/REACH environmental standards
- Right-hand UNC coarse threading provides rapid installation and superior holding power in plastic and soft materials
- Fully threaded design offers maximum adjustability and consistent clamping force along the entire fastener length
Professional Applications & Engineering Value
These glass-filled nylon socket head cap screws solve critical challenges in electrical enclosures, medical devices, and food processing equipment where non-conductive, corrosion-resistant fasteners are essential. The 4-40 UNC coarse thread configuration prevents cross-threading in soft substrates while maintaining Class 2A precision fit for vibration-prone applications. The black glass-filled nylon material provides excellent dimensional stability and UV resistance for outdoor applications, while the temperature range of -20° to 230° F ensures reliability in thermal cycling environments. The standard socket head profile with 3/32" hex drive accommodates high-torque installation without stripping, making these plastic fasteners ideal for repeated maintenance cycles in sensitive equipment.
Specification Summary & Compliance
Manufactured to inch system specifications with 4-40 UNC coarse threads maintaining Class 2A thread fit tolerances for precision assembly. These socket head cap screws comply with UL 94 HB flammability standards and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fully threaded 1/4" length provides consistent engagement depth across applications while maintaining dimensional stability across the specified temperature range.
