S-91970A583 5/16"-18 x 1" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance eliminates rust concerns in humid or chemical environments, extending service life without protective coatings.
• Excellent electrical insulation properties prevent current conduction, making them ideal for electrical assemblies and sensitive electronic applications.
• Lightweight nylon construction reduces overall assembly weight while maintaining durability, perfect for applications where weight savings are critical.
• Wide operating temperature range from -40°F to 185°F ensures reliable performance in both freezing and elevated temperature conditions.
• External hex drive design allows for easy installation and removal with standard tools, speeding up assembly and maintenance processes.
• Class 2A thread fit with UNC coarse threading provides consistent, secure fastening and reduces cross-threading risks during installation.
• RoHS 3 compliance guarantees environmental safety and meets international regulatory standards for hazardous substance restrictions.

Professional Applications & Engineering Value

These 5/16"-18 UNC nylon hex head screws deliver critical engineering advantages in demanding industrial settings. The nylon plastic material inherently resists corrosion from moisture, chemicals, and salts, eliminating the need for additional plating or treatments that can fail over time. This makes them particularly valuable in electrical enclosures, control panels, and marine equipment where metal fasteners would corrode or create electrical shorts. The fully threaded design with coarse UNC threading ensures maximum grip strength across the entire fastener length, while the external hex drive accommodates high-torque applications without stripping. Engineers specify these screws for non-conductive, non-magnetic assembly solutions that maintain integrity across wide temperature fluctuations from -40°F to 185°F.

Specification Summary & Compliance

This fastener features 5/16"-18 UNC coarse threads with Class 2A thread fit tolerances per ANSI/ASME B1.1 standards, ensuring consistent dimensional accuracy and proper mating with corresponding nuts and threaded holes. The fully threaded, right-hand thread configuration provides complete engagement along the 1" length. Manufacturing complies with RoHS 3 (2015/863/EU) regulations, restricting hazardous substances for environmental safety. The black nylon construction maintains dimensional stability across the specified temperature range without significant expansion or contraction.