Electro Hardware HHCS-516-1-N Hex Head Cap Screw Nylon

Product Description

The ELECTRO HARDWARE HHCS-516-1-N is a fully threaded hex head cap screw in 5/16-18 UNC thread, measuring 1 inch under the head. Manufactured from Grade 6/6 nylon with no finish coating, this fastener is suited for applications where corrosion resistance, electrical non-conductivity, or reduced weight is a priority over metal hardware. It meets ASTM D789-66 Type 1 GDE2 standards for nylon material quality. Installed with a standard hex wrench or socket, it provides a secure, rust-free mechanical connection in environments where metal fasteners would corrode, conduct electricity, or add unnecessary weight.

Nylon hex head cap screws in the 5/16-18 UNC thread size are commonly used in HVAC, electrical, plumbing, and pool equipment assemblies where plastic or fiberglass panels, enclosures, and junction boxes require a non-metallic fastener. They are also used in light structural and equipment-mounting applications where chemical resistance or electrical isolation is required. Suitable for both indoor and outdoor installations where ambient conditions favor non-metallic hardware.

Key Features

• Grade 6/6 nylon construction for corrosion resistance and electrical non-conductivity
• Fully threaded along the entire shank length for maximum thread engagement
• 5/16-18 UNC thread standard for broad compatibility with inch-series hardware
• 1 inch length under head provides consistent clamping depth
• Uncoated finish maintains dimensional accuracy and chemical resistance
• Meets ASTM D789-66 Type 1 GDE2 nylon material standard

Compatibility

Designed as a standard inch-series nylon hex head cap screw for use in any application requiring a 5/16-18 UNC fully threaded fastener in a non-metallic, uncoated nylon material.

Installation Notes

This fastener should be installed by a qualified technician familiar with nylon hardware torque limitations. Nylon fasteners require lower torque than steel equivalents — avoid impact drivers and over-tightening, which can crack or strip the nylon threads. Power down or de-energize any equipment before fastener service in electrical or HVAC enclosures. Follow applicable NEC or equipment manufacturer guidelines for fastener material selection in electrical assemblies.