S-91221A212 4-40 x 3/16" 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 chemical resistance and durability from glass-filled nylon construction, ideal for harsh industrial environments
- Excellent electrical insulation properties for safe use in electrical assemblies and sensitive electronic applications
- Wide operating temperature range (-20° to 230° F) ensures reliable performance in both cold and high-heat conditions
- Precise Class 2A thread fit with 4-40 UNC coarse threads for easy installation and secure fastening in various materials
- Standard hex socket drive (3/32") allows for high torque application and flush mounting in confined spaces
- Full regulatory compliance with UL 94 HB flammability rating, RoHS 3, and REACH standards for global market acceptance
- Lightweight and corrosion-resistant alternative to metal fasteners, reducing component weight without sacrificing strength
Professional Applications & Engineering Value
Engineered for demanding applications where electrical insulation and chemical resistance are critical, these glass-filled nylon socket head cap screws provide exceptional value in electrical enclosures, control panels, and instrumentation. The 4-40 UNC coarse threads with Class 2A fit ensure reliable engagement in plastics and soft metals, while the standard hex drive accommodates high-torque installation without stripping. With temperature resistance from -20° to 230°F and compliance with UL 94 HB flammability standards, these screws solve critical challenges in electrical applications where metal fasteners could cause short circuits or galvanic corrosion.
Specification Summary & Compliance
This socket head cap screw features precision 4-40 UNC coarse threads with Class 2A tolerance for consistent fit and performance. Manufactured to meet UL 94 HB flammability specifications and fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fully threaded design and right-hand threading provide maximum holding power across the entire 3/16" length.
