Quick answer: most push rivets are made from nylon (polyamide) because it is tough, slightly flexible, and resists oil, fuel splash and road salt. Its weak points are long exposure to strong sunlight, which can make some grades brittle, and very low temperatures, which make it stiffer to install. Black rivets usually carry carbon black, which improves UV resistance. White or natural rivets are mainly chosen to match light-coloured panels.
When a plastic rivet snaps on removal or crumbles after a few summers, the cause is usually the material or the environment rather than bad luck. Here is what is going on inside that small fastener.
Why nylon?
Nylon is the default choice for push rivets for several reasons:
- Toughness: it bends rather than shattering, so the legs can spread and relax many times.
- Spring: the legs return to shape when the pin is lifted, which is why nylon rivets are often reusable.
- Chemical resistance: nylon copes well with oils, greases and fuel splash.
- No corrosion: it won't rust and won't react with metal panels.
- Low friction: the pin slides in smoothly, so it locks with thumb pressure.
Our 8mm push rivets are black nylon, with an 8mm shank, 15mm head and 21mm length.
How the environment affects nylon rivets
| Condition | Effect on nylon | What to do |
|---|---|---|
| Strong sunlight (UV) | Unprotected nylon can chalk and become brittle over time | Prefer black (carbon-black) rivets on exposed panels; inspect yearly |
| Cold | Stiffer; legs harder to spread; heads can crack if forced | Warm rivets before installing; don't hammer pins |
| Heat | Softens near hot components | Keep away from exhaust parts; follow the original design |
| Water and humidity | Nylon absorbs some moisture and becomes a little more flexible | Normal; this actually helps toughness |
| Salt and road grime | No corrosion; grime can jam the pin | Clean heads before removal |
| Fuel, oil, grease | Generally resistant to splash | Wipe off; avoid long soaking in solvents |
Black vs white plastic rivets
Black
Black is the standard for automotive, powersports and marine panels. The carbon black pigment helps nylon resist UV, and black heads disappear against dark trim, liners and plastics. If the rivet will see sun, black is usually the safer choice.
White or natural
White and natural (off-white) rivets are chosen mainly for looks: light-coloured RV interiors, white boat panels, signage and light-coloured enclosures. Natural nylon without pigment can be more prone to UV ageing outdoors, so check the product specification if it will be in direct sun.
Other colours
Grey and beige versions exist to match interior trim. Colour has no effect on fit, so measure the hole and grip range as usual.
Signs your rivets are past it
- Heads that look chalky, faded or grey instead of black.
- Fine cracks around the head or where the legs join it.
- Pins that pop up on their own or spin freely.
- Legs that snap when you remove the rivet.
When you see these on one rivet, the rest on that panel have had the same exposure. Replace them as a set. Our installation guide covers how to check old rivets for reuse.
Storing spare rivets
- Keep them in a sealed bag or box, out of direct sun.
- Room temperature is ideal. A hot truck dashboard or a freezing shed won't ruin them quickly, but they last longest stored indoors.
- Label the bag with the size and what you used it for, so you don't have to measure again next time.
Choosing the right nylon push rivet
- Hole size first: measure the hole. See the size guide.
- Grip range second: measure the stack. See the grip range guide.
- Head size third: wider heads spread clamping on soft plastics.
- Colour last: black for most exterior and powersports uses.
Browse the automotive push rivets or the full range of push rivets.
Nylon vs other plastic fasteners
Not every plastic fastener is nylon. You will also come across these:
| Material | Character | Where you see it |
|---|---|---|
| Nylon (polyamide) | Tough, springy, good chemical resistance | Most push rivets and panel clips |
| Polypropylene | Light and flexible, less stiff than nylon | Some Christmas-tree clips and low-cost clips |
| Acetal (POM) | Stiff, low friction, holds shape | Some screw rivets and precision clips |
For push rivets, the spring in nylon matters most. The legs need to close for insertion and open again when the pin goes in, many times over if you service the panel often. That is why nylon dominates.
Material and reuse
A rivet that has spent several summers on an exposed panel won't spring back like a new one, even if it looks fine. When you remove panels on an older vehicle, have new rivets ready rather than counting on reusing every old one. Our removal guide shows how to get old ones out cleanly.
Every 8mm option we stock is grouped in one place: the 8mm push rivets collection.
FAQ
Are nylon push rivets UV resistant?
Black nylon with carbon black holds up better in sunlight than unpigmented nylon. All plastics age eventually, so inspect exposed rivets periodically.
Do nylon rivets work in cold weather?
Yes. They get stiffer in the cold, so warm them before installing and press pins steadily rather than striking them.
Is the colour just cosmetic?
Mostly. Black pigment also improves UV resistance; otherwise colour doesn't change fit.
Are nylon rivets reusable?
Often, as long as the legs and pin are intact and the rivet still locks firmly.
Why did my old rivets snap when I removed them?
Age, sun and cold make plastic less flexible. Lift the pin fully before levering, and warm the area first if it is cold.