Nylon Washer Self Drilling Screw for Roofing | Surface Protection & Anti-Corrosion
In many roofing and steel structure projects, standard metal washer screws may cause surface damage or corrosion over time, especially in humid or coastal environments.
Nylon washer screws are used to solve these problems by reducing direct metal contact and improving sealing performance during installation.
Where This Screw Makes a Difference
This type of screw is not necessary for all applications. It is mainly used when surface protection or corrosion prevention is required.
Typical cases include:
Metal roofing with painted or coated sheets
Sandwich panels where surface finish must be preserved
Projects in coastal or high humidity environments
Structures where dissimilar metals are in contact
Key Features
Nylon / Plastic Head – lightweight, non-conductive, and resistant to chemicals.
Self-Drilling Point – drills into metal or sheet steel without pre-drilling.
Corrosion Resistance – nylon head prevents rust beneath the head.
Aesthetic Options – available in white, black, grey, or custom colors.
Weatherproof – UV- and ozone-resistant for long outdoor service life.
Technical Data Sheet (Typical Values)
Body Material: Carbon steel (C1022) or stainless steel
Head Material: Nylon (PA6 or PA66, UV-stabilized available)
Head Styles Available: Pan head, truss head, washer head, cap head
Thread Type: Self-drilling, DIN 7504 standard
Tensile Strength (metal body): ~560–620 N/mm²
Nylon Head Properties:
Temperature: -30°C to +120°C
Electrical Insulation: Excellent, non-conductive
UV Resistance: High (outdoor-grade nylon)
Finishes (metal body): Zinc-plated, Ruspert, or stainless
ASME IFI and Metric standard Size
|
Diameter |
Length |
|
#6-20(ST3.5) |
1/2''-2''inch (13-50mm) |
|
#8-18(ST4.2) |
1/2''-2''inch (13-50mm) |
|
#10-16(ST4.8) |
1/2''-4''inch(13-100mm) |
|
#12-14(ST5.5) |
1/2''-6''inch(13-150mm) |
|
#14-14(ST6.3) |
1/2''-6''inch(13-150mm) |
Applications
Nylon (plastic) head self-drilling screws are used in:
Roofing with Sealing Requirement
Used in metal roofing systems where additional sealing and surface protection are needed
01
Sandwich Panel Installation
Suitable for insulated panels, reducing surface damage during installation
02
Coastal and Humid Environments
Helps reduce corrosion risk in areas with high moisture exposure
.
03
Steel Structures with Coated Surface
Protects painted or galvanized surfaces from scratches
04
Light Industrial Buildings
Widely used in warehouses, prefabricated buildings, and roofing systems
05
Advantages
Enhanced Corrosion Protection
Nylon reduces direct metal contact, helping prevent corrosion
Improved Sealing Performance
Provides better sealing effect in roofing and panel systems
Surface Protection
Avoids scratching or damaging coated materials
Reduced Galvanic Reaction
Minimizes electrochemical reaction between dissimilar metals
Stable Fastening Performance
Maintains consistent clamping force under varying conditions
How Nylon Washer Improves Performance
During installation, the nylon washer works as a buffer layer between the screw and the material surface.
This helps to:
reduce friction during fastening
prevent coating damage
improve sealing around the hole
limit moisture penetration
Unlike rubber washers, nylon offers better stability under temperature changes.
Choosing the Right Coating
The nylon washer improves surface protection, but overall corrosion resistance still depends on the coating.
Zinc plated → indoor or dry use
Ruspert → general outdoor roofing
HDG → coastal or heavy-duty environments
If the project is exposed to salt or chemicals, coating selection becomes critical.
Common Questions from Buyers
Do I really need nylon washer screws?
Only when surface protection or sealing is important. For standard steel fixing, normal screws are sufficient.
Will nylon affect installation torque?
It may slightly reduce friction, making installation smoother.
Is it better than EPDM washer?
EPDM provides better waterproof sealing, while nylon is better for surface protection and isolation.
Comparison Table
| Feature | Nylon Washer Screw | EPDM Washer Screw | Metal Washer Screw |
|---|---|---|---|
| Surface protection | Excellent | Good | Poor |
| Waterproof sealing | Medium | Excellent | Low |
| Electrical insulation | Excellent | Low | None |
| UV resistance | High | High | Medium |
| Decorative appearance | Excellent | Medium | Low |
| Typical application | Panels, electrical, decorative | Roofing | Structural steel |
How to Select The Right Nylon Hex Washer Head Self Drilling Screws?
Choosing the correct nylon fastener requires more than just picking a size. Unlike metal screws, nylon (PA66) has unique properties. Follow this 4-step engineering guide to ensure the best fit for your project:
1. Match the Drill Point to Material Thickness
Nylon screws are softer than steel. You must choose the correct diameter to penetrate your base material without stripping the threads.
ST4.2 (Φ4.2mm): Best for thin sheets (0.5mm - 2.0mm), such as aluminum profiles or thin plastic housing.
ST4.8 (Φ4.8mm) & ST5.5: Ideal for thicker materials (2.5mm - 4.0mm), like steel framing or heavy-duty PVC.
ST6.3 (Φ6.3mm): For heavy structural connections requiring high pull-out force.
2. Check the Environment (Chemical vs. UV)
Chemical Resistance: If used in chemical plants or water treatment, standard Nylon 66 is excellent against alkalis and oils.
UV Exposure: For long-term outdoor use, ensure the nylon is UV-stabilized (usually black color) to prevent brittleness caused by sunlight.
3. Verify Insulation & Thermal Needs
Nylon is naturally non-conductive and non-magnetic.
Dielectric Strength: Perfect for PCB boards and electronic components where metal screws would cause short circuits.
Temperature Limit: Standard PA66 works continuously up to 100°C - 120°C. Do not use in high-heat exhaust systems.
4. Washer Selection for Sealing
The integrated EPDM or nylon washer is crucial. Ensure the washer diameter is large enough to cover the clearance hole, providing a watertight seal for roofing or outdoor enclosures.
Supply Information
We supply nylon washer self drilling screws in standard and customized specifications, including OEM packaging and coating options.
If your project involves coated steel, roofing, or humid environments, nylon washer screws can help improve durability and reduce damage.
Send us your application details for recommendation.
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