S-91221A219 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
- Enhanced durability and strength from glass-filled nylon construction, resisting wear in demanding industrial environments
- Reliable torque transmission with hex socket drive design, preventing stripping and ensuring secure fastening
- Broad temperature resistance from -20° to 230°F, maintaining performance in varied operating conditions
- Precise Class 2A thread fit for smooth assembly and consistent engagement with UNC coarse threads
- Compliance with safety standards including UL 94 HB, RoHS 3, and REACH, ensuring material safety and regulatory adherence
- Corrosion-resistant plastic material ideal for electrical and chemical applications where metal fasteners may fail
- Fully threaded design providing uniform clamping force along the entire 3/4" length
Professional Applications & Engineering Value
These glass-filled nylon socket head cap screws deliver exceptional value in applications requiring electrical insulation, chemical resistance, and weight reduction. The 4-40 UNC coarse threads with Class 2A fit ensure reliable engagement in plastic and soft materials, while the hex drive design maximizes torque application without cam-out. Engineered for industrial equipment, electronic enclosures, and automotive components, these fasteners solve critical challenges where metal corrosion, electrical conductivity, or thermal expansion would compromise performance. The off-white color provides visual contrast for inspection, and the temperature range supports use in both indoor and outdoor environments.
Specification Summary & Compliance
This socket head cap screw features precise Class 2A thread fit with 4-40 UNC coarse threads in inch system measurements. Manufacturing complies with UL 94 HB flammability standards and environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. The fully threaded design maintains consistent thread diameter and spacing throughout the 3/4" length, ensuring reliable performance in industrial fastening applications.
