S-91970A581 5/16"-18 x 3/4" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Excellent corrosion resistance due to nylon plastic construction, eliminating rust concerns in humid or chemical environments
• Secure, reliable fastening with external hex drive providing maximum torque transfer and preventing stripping during installation
• Broad temperature compatibility from -40°F to 185°F, maintaining performance in varied operational conditions
• Electrical insulation properties ideal for preventing short circuits in electrical assemblies and enclosures
• Lightweight yet durable nylon material reduces overall assembly weight without sacrificing structural integrity
• Precise UNC coarse threading (Class 2A) ensures smooth engagement and consistent clamping force in inch-system applications
• Environmentally compliant manufacturing meeting RoHS 3 standards for restricted hazardous substances

Professional Applications & Engineering Value

These black nylon hex head screws deliver critical solutions for applications requiring electrical insulation and corrosion resistance. The nylon plastic construction inherently resists moisture, chemicals, and galvanic corrosion, making them ideal for electrical enclosures, control panels, and outdoor equipment. The UNC coarse thread design facilitates quick assembly and disassembly, while the fully threaded body ensures consistent load distribution along the entire fastener length. With a temperature range of -40°F to 185°F, they maintain dimensional stability in both freezing and elevated temperature environments, preventing loosening due to thermal expansion. The external hex drive allows for high-torque installation with standard tools, streamlining production processes in industrial assembly lines and maintenance operations.

Specification Summary & Compliance

This 5/16"-18 x 3/4" hex head screw features UNC coarse threading with Class 2A tolerance for reliable fit in standard inch applications. Manufactured from black nylon plastic with right-hand thread orientation and fully threaded shank. Compliant with RoHS 3 (2015/863/EU) regulations, ensuring environmental safety in electronic and industrial sectors.