Nylon rivets are one-piece or two-piece blind fasteners manufactured from engineering-grade nylon, designed to join panels and components from a single access side without tools or specialist equipment. Their non-conductive, non-corroding properties make them the standard specification in electronics, automotive trim, medical devices, and industrial enclosures where metal fasteners introduce conductivity, galvanic corrosion, or weight penalties.
Types & Engineering Characteristics
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Push-In / Snap Rivets Inserted into a pre-punched hole; the split legs expand radially on the blind side under axial load, creating a positive mechanical lock. Suitable for thin-to-medium panel stacks (typically 1–12 mm grip range). Reusable designs are rated for up to 25 insertion/removal cycles — selected wherever assemblies require periodic maintenance access.
Drive Rivets A single hammer blow or press force drives the centre pin, expanding the shank irreversibly for permanent blind-side fixing. Fast cycle time for high-volume assembly lines. Not intended for disassembly.
Two-Piece (Male/Female) Rivets A studded male shank clicks into a female receptacle by hand pressure alone. Panel-to-panel clamping force is determined by the interference fit between male and female components. Widely used in medical visors, signage, and display panels requiring tool-free field assembly.
Ratchet Rivets Two identical halves interlock via a progressive ratchet mechanism. The ratchet geometry resists back-out under vibration loads, making these a high anti-vibration option among plastic fasteners. Specified in automotive trim panels and vibrating machine guards.
Countersunk Rivets 90° or 120° countersunk head sits flush to the panel surface. Reduces protruding head interference in sliding track assemblies, drawer runners, and aerodynamic panels.
Material & Performance Specifications
| Property | Standard Grade | High-Temp Grade |
|---|---|---|
| Base polymer | Nylon 6/6 (PA66) | Polysulfone (PSU) |
| Tensile strength | 80 MPa | 70 MPa |
| Flexural modulus | 2,900 MPa | 2,700 MPa |
| Operating temp (continuous) | –40°C to +85°C | –40°C to +155°C |
| Melting point | 265°C | 185°C (Tg) |
| Flame rating | UL94 V-2 / HB | UL94 V-0 |
| Volume resistivity | >10¹⁴ Ω·cm | >10¹⁵ Ω·cm |
| Dielectric strength | ~14 kV/mm | ~16 kV/mm |
| Water absorption (24h) | 1.2% | 0.3% |
| Chemical resistance | Oils, fuels, aliphatic hydrocarbons, dilute acids | Concentrated acids, chlorinated solvents |
| UV resistance | Standard: limited; Black (carbon-black filled): good | Good |
| RoHS compliance | Yes | Yes |
| Colour | Natural (off-white), Black | Natural, Black |
Nylon 6/6 vs Nylon 6 — Engineering Comparison
| Property | Nylon 6/6 (PA66) | Nylon 6 (PA6) |
|---|---|---|
| Melting point | 265°C | 220°C |
| Tensile strength | 80 MPa | 75 MPa |
| Flexural modulus | 2,900 MPa | 2,600 MPa |
| Impact resistance | Moderate | Higher |
| Water absorption | 1.2% | 1.6% |
| Dimensional stability | Better | Moderate |
Nylon 6/6 is the default specification for structural fasteners due to its good stiffness and dimensional stability under load. Nylon 6 is selected where higher impact resistance or post-moulding flexibility is required.
Dimensional Parameters & Sizing
Nylon rivets are specified by three primary dimensions:
- Shank diameter (d) — Standard range: 3.0 mm / 4.0 mm / 4.8 mm / 5.0 mm / 6.0 mm
- Head diameter (D) — Typically 2.0–2.5× shank diameter depending on head style
- Grip range (T) — The total panel stack thickness the rivet will securely clamp; must be matched precisely to the application
Hole tolerance: Drill or punch the panel hole to H11 tolerance for the nominated shank diameter to ensure correct leg expansion geometry and optimal pull-out resistance.
Panel thickness guidance:
| Shank Diameter | Typical Grip Range |
|---|---|
| 3.0 mm | 1.0 – 6.0 mm |
| 4.0 mm | 1.5 – 10.0 mm |
| 4.8 mm | 2.0 – 14.0 mm |
| 6.0 mm | 3.0 – 20.0 mm |
Installing a rivet below its minimum grip range results in insufficient leg expansion and reduced pull-out force. Installing above the maximum grip range prevents full head seating and compromises clamping load.
Mechanical Performance Data
| Parameter | Typical Value (PA66, ⌀4.8 mm) |
|---|---|
| Pull-out force (axial) | 80–150 N |
| Shear strength | 60–120 N |
| Reuse cycles (snap types) | Up to 25 cycles |
| Torque resistance | Low (not suitable for rotational loads) |
| Vibration resistance | Good (ratchet types: good) |
Values are indicative. Actual performance depends on panel material, hole quality, and installation method. For structural or safety-critical applications, conduct application-specific pull-out testing.
Installation Guide
- Hole preparation — Drill or punch a clean burr-free hole to the shank diameter +0.1 mm tolerance. Misaligned or oversized holes reduce pull-out resistance by up to 40%.
- Panel alignment — Stack panels so holes are concentric before insertion.
- Insertion (push-in type) — Apply steady axial pressure until the head seats fully flush. An audible click confirms correct leg expansion.
- Insertion (drive rivet) — Insert shank through panels; strike the centre pin flush with a hammer or press at approximately 50–100 N force.
- Removal (reusable types) — Insert a flat 2 mm blade tool under the head flange and apply outward lever force. Do not prise against the panel surface to avoid surface damage.
Typical Applications by Industry
| Industry | Application | Recommended Type |
|---|---|---|
| Electronics | PCB panel mounting, enclosure assembly | Push-in / snap |
| Automotive | Door cards, dashboard trim, under-bonnet covers | Ratchet (anti-vibration) |
| Medical | Visor assembly, device housings | Two-piece male/female |
| Signage & display | Retail panels, exhibition stands | Two-piece / push-in |
| Industrial | Machine guards, control panel covers | Drive rivet / ratchet |
| Packaging | Cardboard and rigid box assembly | Push-in (reusable) |
Frequently Asked Questions
What grip range should I specify? Measure the total combined thickness of all panels being joined. Select a rivet whose stated grip range brackets that measurement — ideally toward the middle of the range, not at the extremes. For variable panel stacks, use a rivet with a wide grip range or a two-piece adjustable design.
Can nylon rivets carry structural loads? Nylon rivets are panel-joining fasteners, not structural load-bearing fasteners. Typical pull-out values for a ⌀4.8 mm PA66 rivet are 80–150 N axial and 60–120 N shear. For applications requiring higher load capacity, increase rivet density (number of rivets per joint) or evaluate metal alternatives.
Will nylon rivets degrade in outdoor environments? Standard natural Nylon 6/6 has limited UV resistance and will embrittle with prolonged UV exposure. Specify black carbon-black filled variants for outdoor applications — carbon black provides long-term UV stabilisation at no significant loss of mechanical properties.
What is the operating temperature limit? Standard PA66 grades are rated for continuous use at –40°C to +85°C. For under-bonnet automotive, sterilisation environments, or elevated-temperature industrial use, select the PSU (polysulfone) high-temperature grade rated to +155°C continuous.
Are nylon rivets electrically insulating? Yes. PA66 has a volume resistivity of >10¹⁴ Ω·cm and dielectric strength of ~14 kV/mm, making nylon rivets non-conductive. They are specified in PCB enclosures, electrical panels, and EV battery housings to reduce metal fastener conductivity risk.
Are these RoHS compliant? Yes. All standard grades in this range are RoHS-compliant and free from restricted substances including lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE, meeting EU Directive 2011/65/EU requirements.
Can I use nylon rivets in chemical environments? PA66 resists oils, fuels, greases, aliphatic hydrocarbons, and dilute acids well. It is attacked by concentrated mineral acids, phenols, and strong oxidising agents. For aggressive chemical environments, review the specific chemical compatibility data for PA66 or specify PSU grade as appropriate.
What hole tolerance should I drill? Drill to H11 tolerance at the nominal shank diameter (e.g., 4.8 mm shank → 4.8–4.9 mm hole diameter). Oversized holes reduce pull-out force; undersized holes prevent full insertion and leg expansion.
Are ratchet rivets truly reusable? Ratchet rivets are designed for secure permanent or semi-permanent installation. While the ratchet mechanism can theoretically be released, repeated disassembly degrades the ratchet teeth and is not recommended. For assemblies requiring regular access, specify push-in / snap rivets instead.
Beyond nylon, see the corrosion-resistant fastener range for fiber-reinforced options in structural applications.
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