S-99091A108 4-40 x 3/8" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Excellent corrosion resistance due to nylon plastic construction, ideal for humid or chemical environments without risk of rust.
• Broad temperature tolerance from -40° to 185°F ensures reliable performance in varied operating conditions.
• Lightweight and non-conductive properties make these screws perfect for electrical and electronic assemblies.
• Easy installation with external hex drive allows for quick, secure fastening using standard tools.
• Precise Class 2A thread fit provides consistent engagement and reduces the risk of cross-threading.
• RoHS 3 compliance guarantees environmental safety and meets strict regulatory standards.
• Fully threaded design offers maximum grip and holding power across the entire length.

Professional Applications & Engineering Value

These 4-40 UNC nylon plastic hex head screws are engineered to address common challenges in electrical and lightweight applications. The nylon material provides inherent corrosion resistance, eliminating the need for additional coatings and reducing maintenance in harsh environments. With a coarse thread and Class 2A fit, they ensure quick assembly and reliable fastening in plastics and soft materials, minimizing stripping. The black color and fully threaded design enhance aesthetics and versatility, while the external hex drive simplifies installation with standard wrenches. Ideal for enclosures, panels, and consumer electronics, these screws deliver durability and compliance with RoHS standards for safe, efficient operations.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, ensuring consistent performance in inch-based systems. It is manufactured from nylon plastic and is fully threaded with a length of 3/8". Compliance includes RoHS 3 (2015/863/EU), confirming adherence to environmental regulations for hazardous substance restrictions.