Electro Hardware HHCS-516-1.50-N Hex Head Cap Screw 5/16-18

Product Description

The ELECTRO HARDWARE HHCS-516-1.50-N is a hex head cap screw manufactured from Grade 6/6 nylon, sized at 5/16-18 UNC thread with a 1.5-inch length under head. This fastener is partially threaded and carries a bright uncoated finish, making it suitable for applications where metal contamination must be avoided or where corrosion resistance and electrical non-conductivity are priorities. It conforms to ASTM D789-66 Type 1 GDE2 standards. Sold in packages of 100, it is commonly sourced by maintenance technicians, electricians, and mechanical assemblers working in environments where non-metallic hardware is specified.

This screw is well suited for light-duty mechanical assemblies, electrical enclosures, HVAC component mounting, and other applications where a non-conductive, corrosion-resistant fastener is required. Nylon construction makes it appropriate for use in wet environments, chemical-exposed service areas, and installations where grounding or conductivity isolation is a design requirement. The 5/16-18 UNC thread pattern fits standard inch-series tapped holes of the same designation.

Key Features

• Grade 6/6 nylon construction provides electrical non-conductivity and corrosion resistance
• 5/16-18 UNC thread pattern for compatibility with standard inch-series tapped holes
• 1.5-inch length under head with partial threading for controlled engagement depth
• Bright uncoated finish — no metallic plating or chemical coating
• Meets ASTM D789-66 Type 1 GDE2 standard for nylon material performance
• Packaged in quantities of 100 for stocking and production use

Compatibility

Designed as a standard inch-series hex head cap screw for use in any application requiring a 5/16-18 UNC partially threaded nylon fastener with a 1.5-inch length under head.

Installation Notes

Nylon fasteners require careful torque management — overtightening will strip threads or crack the fastener head. Use a 1/2-inch hex wrench or appropriately sized socket. Do not use impact drivers on nylon hardware. Confirm that the mating tapped hole or nut is clean and free of debris before installation to prevent cross-threading.