S-91221A164 4-40 x 7/8" 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 durability and strength with glass-filled nylon construction, resisting wear and deformation in demanding environments.
- Reliable performance across a wide temperature range from -20° to 230°F, ideal for applications with thermal fluctuations.
- Secure and precise fastening thanks to the UNC coarse thread and Class 2A thread fit, ensuring consistent engagement and reduced cross-threading risks.
- Easy installation and removal with a standard hex drive (3/32"), providing a firm grip and minimizing tool slippage.
- Full compliance with safety and environmental standards including UL 94 HB for flammability, RoHS 3, and REACH, supporting sustainable and safe industrial use.
- Lightweight and corrosion-resistant off-white plastic design, reducing overall assembly weight without sacrificing integrity.
- Versatile fully threaded 7/8" length for uniform clamping force and adaptability in various material thicknesses.
Professional Applications & Engineering Value
These glass-filled nylon socket head cap screws are engineered to address common industrial challenges such as corrosion, electrical insulation needs, and weight reduction. The 4-40 UNC coarse thread and Class 2A thread fit provide reliable fastening in plastics and soft metals, reducing the risk of stripping. With a temperature resistance from -20° to 230°F, they perform consistently in automotive, electronics, and machinery assemblies where thermal stability is critical. The hex drive design ensures easy access in confined spaces, while the material's inherent properties resist chemicals and moisture, extending service life in harsh conditions without conductive risks.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including UNC coarse threads with a Class 2A thread fit for consistent accuracy. It meets UL 94 HB for flammability resistance, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance in global markets.
