S-99091A109 4-40 x 5/16" Plastic Hex Head Screws
Plastic Hex 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 nylon plastic construction, ideal for harsh environments where metal fasteners would fail
- Excellent electrical insulation properties for safe use in electrical assemblies and components
- Reliable performance across a wide temperature range from -40° to 185°F, maintaining integrity in varying operational conditions
- Easy installation and removal with a standard 3/16" external hex head, compatible with common tools for efficient assembly
- Secure and precise fastening ensured by the Class 2A thread fit and coarse UNC thread profile, reducing cross-threading risks
- Maximum holding power from the fully threaded design, providing consistent grip along the entire 5/16" length
- Environmentally compliant manufacturing meeting RoHS 3 standards, supporting sustainable and safe production practices
Professional Applications & Engineering Value
These 4-40 UNC nylon plastic hex head screws are engineered to address common industrial challenges where metal fasteners are unsuitable. The black nylon material offers inherent resistance to corrosion, chemicals, and moisture, making them perfect for electrical enclosures, automotive components, and outdoor equipment. The coarse thread design ensures quick assembly and reduced susceptibility to vibration loosening, while the external hex drive allows for high-torque application without stripping. This combination provides a lightweight, durable, and non-conductive fastening solution that maintains performance in temperature-sensitive applications, from sub-freezing conditions to elevated heat environments.
Specification Summary & Compliance
This product features a 4-40 UNC coarse thread with a Class 2A thread fit for consistent dimensional accuracy and reliable engagement. The thread diameter is 0.112" with a 5/16" fully threaded length, and the hex head measures 3/16" in width and 1/16" in height. Manufacturing and material compliance adhere to RoHS 3 (2015/863/EU) regulations, ensuring the absence of hazardous substances for safe use in various industries.
