🔩 Nylon Plastic Screw Caps – Hex Nut Cover Protective Cap Set for Bolts (Black / White)
If you have exposed bolt ends sticking out of a project – whether it’s a piece of furniture, a marine fitting, or outdoor equipment – those sharp metal threads can snag clothes, scratch skin, or just look unfinished. These nylon plastic hex nut covers snap right over standard hex nuts and bolt ends, giving you a smooth, rounded dome. Made from tough PA66 nylon, they won’t rust, corrode, or conduct electricity. I use them on boat hardware, workshop jigs, and even kids’ playground builds to cover exposed threads. Choose black or white to match your hardware or blend into the background.
✨ Why These Nylon Hex Nut Covers Stand Out
🛡️ Protective cap for bolt ends & hex nuts – Covers sharp threads and nut corners, preventing injuries and protecting surrounding materials from scratches.
🧪 High-quality PA66 nylon material – Strong mechanical strength, good toughness, high tensile and compressive strength. Also non-toxic, odorless, antibacterial, anti-mold, and flame-retardant.
🔧 Smooth & burr-free finish – Precision molded with no rough edges. The snug fit keeps the cap securely in place without falling off.
🌧️ Anti-corrosion & rust-proof – Unlike metal acorn nuts, nylon never rusts. Perfect for damp basements, marine environments, or outdoor furniture.
🧵 Clean, even threads inside – The interior threading (or smooth grip design) matches standard metric hex nuts, providing even force distribution without cross-threading.
🏭 Wide industrial & DIY application – Used in medical equipment, wind power, office furniture, marine industry, and general home hardware.
📏 Technical Specifications – Nylon Hex Nut Protective Covers
| Brand |
Goobetter |
| Product Type |
Nylon plastic hex nut cover / acorn-style cap nut (push-on protective cap) |
| Material |
PA66 Nylon (high-strength engineering plastic) |
| Color Options |
Black, White |
| Finish |
Untreated (natural smooth nylon) |
| System of Measurement |
Metric (compatible with standard metric hex nuts) |
| Compatible Bolt/Nut Sizes |
Typically M4, M5, M6, M8, M10, M12 (please check variant selection) |
| Shape |
Hexagonal exterior with domed top (acorn style) |
| Key Properties |
High mechanical strength, corrosion-resistant, flame-retardant, non-toxic, antibacterial, anti-mold |
❓ Frequently Asked Questions – Nylon Hex Nut Covers
🔩 What sizes do these nylon cap nuts fit?
These are designed to fit standard metric hex nuts – common sizes like M4, M5, M6, M8, M10, and M12. The interior has a hex-shaped cavity that grips the nut snugly. When ordering, select the size that matches your bolt diameter. If you’re unsure, measure the flat-to-flat width of your nut – we provide a sizing chart upon request.
🛡️ Do I need to glue these on, or do they stay by themselves?
They stay on by friction fit. The nylon material has a little flexibility – you push the cap over the hex nut and it grips the corners. For most applications (vibration from machinery, boat engines), they hold fine. If you’re using them in high-vibration environments, a tiny drop of silicone adhesive inside the cap adds extra security. But for furniture, shelving, or light outdoor use, no glue is needed.
🌊 Can I use these nylon nut covers in saltwater or outdoor weather?
Absolutely. Nylon is naturally corrosion-resistant, unlike metal caps that rust. They hold up well against moisture, salt spray, and UV exposure (though prolonged direct sunlight may cause slight fading over years). Many customers use them on dock hardware, boat trailers, and outdoor playgrounds. Also, nylon is non-conductive, so they’re safe near electrical components.
🎨 Do you offer other colors besides black and white?
Currently we stock black and white as standard. If you need a custom color (gray, yellow, red, etc.) or a large quantity, contact us – we may be able to arrange a special run. Black is the most popular for hiding caps on dark equipment, while white blends in on appliances or light-colored furniture.
🛠️ Will these caps protect against electrical shorts?
Yes. Nylon is an excellent electrical insulator. Using these plastic screw caps on exposed bolt terminals or metal enclosures can prevent accidental shorts if a tool or wire touches the bolt head. They’re commonly used in control panels, battery terminals, and electronic enclosures for that reason.
