304 Stainless Steel Waterproof Roofing Washers M4.2–M6.3

304 Stainless Steel Composite Waterproof Roofing Washers

Keep your roofing and exterior fastening projects sealed tight with these heavy-duty 304 Stainless Steel Composite Waterproof Gasket Washers. Engineered as a flat-pad composite design, each washer combines a durable stainless steel outer ring with a rubber sealing layer to create a reliable waterproof barrier around drill-tail screws — perfect for metal roofing, cladding, guttering, and general outdoor construction applications.

Key Features

• Grade 304 Stainless Steel — Excellent corrosion resistance for long-lasting outdoor performance
• Composite Flat-Pad Design — Stainless steel bonded with a rubber seal for superior waterproofing around fastener heads
• Anti-Loose & Anti-Slip — Engineered to grip firmly and resist loosening under vibration and load
• Wide Size Range — Available in M4.2, M4.8, M5.5, and M6.3 to suit a variety of drill-tail screws
• Versatile Application — Ideal for metal roofing sheets, polycarbonate panels, cladding, fencing, and structural fastening
• Customizable Quantities — Contact us for bulk orders or non-listed sizes at wholesale pricing

Specifications

Why Choose These Roofing Washers?

Whether you're installing corrugated metal roofing, polycarbonate sheets, or steel cladding, a good waterproof washer is essential. These composite gaskets create a tight, leak-resistant seal around each screw hole, preventing water ingress and reducing the risk of rust staining or structural water damage over time. The anti-loose design also helps maintain fastener integrity even in high-wind or high-vibration environments.

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• 10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips
• 10pcs Durable Anti-Loosening Nut Metal Universal Trimmer Accessories

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Frequently Asked Questions

Q: What sizes of roofing washers are available in this listing?

A: These composite waterproof washers are available in four sizes: M4.2, M4.8, M5.5, and M6.3. Please select your required size and quantity before adding to cart. If you need a size not listed, contact us directly for a custom order.

Q: Are these washers suitable for outdoor and roofing applications?

A: Yes. The 304 stainless steel construction provides excellent resistance to rust and corrosion, making these washers well-suited for outdoor environments including metal roofing, cladding, fencing, and any application exposed to moisture or the elements.

Q: How does the composite waterproof design work?

A: Each washer features a flat-pad composite construction — a stainless steel ring bonded with a rubber or EPDM-type sealing layer. When a drill-tail screw is driven through the washer and into the substrate, the rubber layer compresses to form a watertight seal around the screw hole, preventing leaks and moisture ingress.

Q: Can I order in bulk or in quantities not listed?

A: Absolutely. We are a professional wholesale hardware supplier. If you need larger quantities or sizes not currently listed in the store, please contact us before placing your order and we'll be happy to accommodate your requirements.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.