S-94613A109 4-40 x 5/16" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Excellent electrical insulation properties - Made from durable nylon plastic, these screws prevent electrical conductivity, making them ideal for sensitive electronic assemblies.
• Superior corrosion and chemical resistance - The nylon material inherently resists rust and many chemicals, ensuring long-term reliability in harsh environments.
• Wide operating temperature range - Performs reliably from -40° to 185°F, maintaining integrity in both cold and moderately high-temperature applications.
• Secure and easy installation - The external hex head design allows for high torque application with standard tools, providing a tight, reliable fit.
• Precision coarse threading (UNC) - The 4-40 UNC coarse thread with Class 2A fit ensures quick assembly and strong holding power in various materials.
• RoHS 3 compliance - Meets strict environmental standards, making them safe for use in regulated industries and products.
• Lightweight and non-magnetic - The off-white nylon construction reduces overall weight and eliminates magnetic interference.

Professional Applications & Engineering Value

These 4-40 UNC nylon plastic hex head screws are engineered to solve critical challenges in electrical and electronic applications where metal fasteners pose a risk. The non-conductive nature of nylon prevents short circuits, making them essential for PCB mounting, electrical enclosures, and instrumentation. Their coarse thread design provides excellent grip in plastic and soft materials, reducing the risk of stripping. The external hex drive allows for secure tightening even in confined spaces, while the temperature resistance from -40° to 185°F ensures performance stability in varying operational conditions. This combination of material properties and Class 2A thread fit delivers reliable, repeatable fastening for maintenance-free assemblies in industries from automotive electronics to consumer appliances.

Specification Summary & Compliance

This fastener features a 4-40 UNC coarse thread with a Class 2A thread fit for consistent dimensional accuracy and reliable engagement. The screw is fully threaded and right-hand direction for standard assembly. Manufacturing and material compliance adhere to RoHS 3 (2015/863/EU) regulations, ensuring they are free of hazardous substances for use in global markets.