S-91970A595 5/16"-18 x 3" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant nylon construction ensures long-lasting performance in humid or chemical-exposed environments without rust or degradation.
• Wide temperature tolerance from -40°F to 185°F maintains structural integrity in both freezing and moderately high-heat applications.
• UNC coarse threading with Class 2A fit provides quick, secure engagement and reduces cross-threading risks during assembly.
• External hex drive design allows for high-torque installation using standard wrenches, speeding up maintenance and assembly processes.
• RoHS 3 compliance guarantees environmentally safe use in regulated industries and global markets.
• Partially threaded shank offers improved grip and clamping force where full threading isn't required, enhancing joint stability.
• Lightweight black nylon material reduces overall assembly weight while providing excellent electrical insulation properties.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black nylon hex head screws solve critical challenges where metal fasteners fail. The nylon plastic construction eliminates galvanic corrosion when joining dissimilar metals, while providing inherent electrical insulation for electrical enclosures and control panels. The UNC coarse thread design ensures rapid installation in plastic housings, composite materials, and soft metals without stripping threads. With temperature resistance from -40°F to 185°F, these partially threaded screws maintain clamping force in outdoor equipment, automotive components, and HVAC systems where thermal cycling occurs. The external hex drive accommodates high torque applications where vibration resistance is crucial, making them ideal for assembly line production and maintenance operations.

Specification Summary & Compliance

Manufactured to inch system specifications with 5/16"-18 UNC coarse threads maintaining Class 2A thread fit tolerances for consistent engagement. The partially threaded design provides minimum 7/8" thread length on a 3" overall length with 1/2" head width and 15/64" head height. Compliant with RoHS 3 (2015/863/EU) regulations for restricted substance control, ensuring environmental responsibility in industrial supply chains.