S-91221A176 4-40 x 3/8" 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
- Corrosion-resistant glass-filled nylon construction ensures long-term reliability in harsh environments without rust or degradation.
- Precise Class 2A thread fit guarantees secure fastening and consistent performance in repetitive assembly applications.
- Wide operating temperature range (-20° to 230°F) maintains structural integrity in both low and high-heat industrial settings.
- Hex socket drive design provides superior torque transmission and prevents stripping during installation.
- Full threading along the 3/8" length offers maximum adjustability and holding power across the entire fastener.
- Compliance with UL 94 HB, RoHS 3, and REACH standards meets rigorous safety and environmental regulations for global manufacturing.
- Coarse UNC thread pattern enables quick assembly and reduced cross-threading risks in high-volume production.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these glass-filled nylon socket head cap screws solve critical challenges in electrical enclosures, automotive components, and food processing equipment where metal fasteners would corrode or conduct electricity. The 4-40 UNC coarse threads with Class 2A fit provide vibration resistance while the hex drive ensures reliable torque application in confined spaces. With temperature resistance from -20° to 230°F, they maintain dimensional stability in thermal cycling applications, eliminating the need for frequent replacements. The fully threaded design offers uniform load distribution, making them ideal for plastic assemblies, bracketing systems, and corrosion-sensitive applications where weight reduction and dielectric properties are paramount.
Specification Summary & Compliance
This socket head cap screw features precision 4-40 UNC coarse threads with Class 2A dimensional tolerance ensuring consistent thread engagement. Manufacturing complies with UL 94 HB flammability standards for plastic materials and demonstrates full conformity to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental directives, making them suitable for regulated industries including electronics, automotive, and consumer goods manufacturing.
