S-91221A179 4-40 x 3/4" 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
- Superior corrosion resistance with glass-filled nylon construction, eliminating rust and chemical degradation in harsh environments
- Lightweight yet durable plastic design reduces component weight while maintaining structural integrity for demanding assemblies
- Wide temperature tolerance from -20° to 230° F ensures reliable performance across diverse operating conditions
- Precise Class 2A thread fit with UNC coarse threads provides secure fastening and consistent engagement in plastic components
- Standard hex drive compatibility with 3/32" drive size enables quick installation using common industrial tools
- Full regulatory compliance including UL 94 HB flammability rating, RoHS 3, and REACH for global market acceptance
- Fully threaded design offers maximum adjustment flexibility and uniform clamping force distribution
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these glass-filled nylon socket head cap screws solve critical challenges in electrical enclosures, medical devices, and food processing equipment where metal fasteners would cause galvanic corrosion or contamination. The black plastic construction provides excellent electrical insulation properties while the 4-40 UNC coarse threads ensure reliable engagement in plastic housings and composite materials. With their temperature range of -20° to 230° F, these hex drive screws maintain dimensional stability in environments experiencing thermal cycling, making them ideal for automotive components, outdoor equipment, and electronic assemblies where weight reduction and corrosion resistance are paramount.
Specification Summary & Compliance
This socket head cap screw features precise Class 2A thread fit with 4-40 UNC coarse threads and standard inch system dimensions. Manufacturing complies with UL 94 HB flammability standards and demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fully threaded design and right-hand thread direction follow industry-standard specifications for consistent performance across industrial applications.
