Nylon Fasteners: Hex Nuts, Cap Screws, Washers, Spacers & Standoffs – Applications & Performance

Nylon Fasteners

Industrial nylon fasteners—including hex nuts, hex‑head cap screws, flat washers, cable ties, spacers, and standoffs—are engineered for strength, durability, and versatility. They find use in printed circuit boards, automotive assemblies, electronics, and textile fastenings.

History of Nylon

Invented by Wallace Carothers at DuPont in the late 1930s, nylon debuted at the 1939 New York World’s Fair as a silk substitute for stockings. Since then, nylon 6/6 has evolved into a cornerstone material for everything from toothbrushes to truck tires.

What is Nylon 6/6?

Nylon 6/6 is a polyamide formed from hexamethylenediamine and adipic acid—each monomer contains six carbon atoms, hence the name 6/6. Its crystalline structure gives it a unique blend of mechanical and thermal properties.

Key Advantages

• Lightweight yet robust
• Cost‑effective production
• Compatible with injection molding
• UV‑stable with appropriate additives
• High dielectric strength for electrical insulation
• Heat tolerant up to 210 °F (99 °C) continuous service
• Fire‑retardant (UL 94 V‑2)
• Exceptional wear and bearing resistance
• Quiet operation and reduced wear on mating parts
• Water‑repellent surface

Common Drawbacks

• Hygroscopic: absorbs moisture, which can alter dimensions
• Limited natural UV resistance
• In molded form, tolerances can be ±0.090 in
• Moderate chemical resistance compared to specialty polymers

Applications of Nylon 6/6

Used in high‑strength, heat‑resistant applications across automotive, electrical, and industrial sectors. Typical components include radiator tanks, rocker covers, air intake manifolds, oil pans, headlamp bezels, and cooling system housings. Its lighter weight than metal contributes to fuel efficiency.

Cable Ties

One of the most recognizable nylon fasteners, cable ties bundle electrical wires with an operating temperature range of –40 °F to +185 °F and a UL 94V‑2 flame rating. They are the industry standard for cable management.

Fastener Variants

Beyond cable ties, nylon 6/6 is molded into machine screws, hex nuts, flat washers, set screws, grub screws, and hex‑head cap screws. The material’s wear resistance makes it ideal for gears, bushings, rollers, and custom components, especially where electrical insulation is required.

Tolerances

While nylon parts can be mass‑produced, precision applications often demand machining. Machined fasteners typically achieve tolerances of ±0.005 in, whereas molded parts range from ±0.005 to ±0.090 in depending on size and design.

Fire Retardancy

With a UL 94 V‑2 rating, nylon 6/6 self‑extinguishes: it melts rather than burns when exposed to flame, preventing further combustion.

Moisture Absorption

Compared to many polymers, nylon absorbs moisture, which can slightly affect dimensional stability but often improves impact resistance and energy absorption.

Need assistance with parts, prints, or troubleshooting? Contact Craftech® Industries, Inc. in Hudson, NY.