S-91970A585 5/16"-18 x 1 1/4" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from durable Nylon Plastic construction, ideal for harsh or chemically active environments without risk of rust or degradation.
• Excellent electrical insulation properties ensure safe, non-conductive performance in electrical assemblies and sensitive electronic applications.
• Wide operating temperature range from -40° to 185°F maintains structural integrity and performance in both freezing and elevated heat conditions.
• Reliable Class 2A thread fit with UNC coarse threading provides secure, easy engagement and consistent clamping force in a variety of materials.
• External Hex Drive and Hex Head design allows for high-torque installation using standard tools, speeding up assembly and reducing labor time.
• Partially threaded shank offers unthreaded grip length for precise positioning and vibration resistance in fastened joints.
• RoHS 3 Compliant composition meets strict environmental regulations, ensuring safety and sustainability in global supply chains.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 5/16"-18 UNC Nylon Plastic Hex Head Screws solve critical challenges in electrical enclosures, marine equipment, and chemical processing where metal fasteners fail. The black nylon material inherently resists moisture, chemicals, and galvanic corrosion, eliminating the need for additional coatings. Its non-conductive properties prevent short circuits, making it a top choice for panel boards, terminal blocks, and outdoor fixtures. The coarse UNC thread and external hex drive ensure quick, tool-friendly installation even in blind or hard-to-reach areas, reducing assembly errors and improving project timelines in MRO, OEM, and electrical contracting.

Specification Summary & Compliance

This screw adheres to Unified Coarse (UNC) thread standards with a Class 2A thread fit for consistent, reliable engagement. Dimensions include a 5/16"-18 thread size, 1 1/4" length, and 1/2" hex head width for precise mechanical requirements. The product is manufactured to be RoHS 3 (2015/863/EU) Compliant, confirming it is free of restricted hazardous substances, and is suitable for use in regulated industries and international markets.