Self Tapping Metal Roofing Screws With Rubber washer
No More Pilot Holes. Just Drill & Drive.
Engineered to Outlast the Roof Itself.
Taper-Sharp Tip. Drills & Fastens in One Go
01
Sinsun Self-Tapping Roofing Screws: Engineered for Lasting Performance
Sinsun Self-Tapping Roofing Screws are designed to make putting up a metal roof quick and easy.
They have a hardened drill point that goes through steel sheets without pre-drilling, and they are also coated with Al-Zn or PVDF to protect against rust.
A bonded EPDM washer ensures a watertight seal over a wide range of temperatures, from-40°C to 120°C. This protects the weather for a long time.
These screws are made to hold corrugated metal sheets and insulation panels to steel substructures.
They are available in diameters from #12 to 14mm and lengths from 25mm to 100mm. For the best holding strength and performance, they need to be at least 20mm deep.
-
Superior Drive Integrity & High-Torque InstallationThe hex washer head design ensures maximum compatibility with socket drivers and impact wrenches, eliminating cam-out and stripping. Every screw is seated flush at high torque, so every screw achieves the designed clamp force and sealing performance.
-
Engineered Corrosion Protection for Specific EnvironmentsWe offer a range of corrosion finishes, from standard galvanized and Dacromet coating. This allows you to select the optimal, cost-effective level of protection against weathering, chemical exposure, or salt spray based on your project's location and lifespan requirements.
-
Reliable, Long-Term Weatherproof SealThe factory-bonded EPDM sealing washer is engineered to compress uniformly, creating an immediate watertight barrier. It remains elastic across extreme temperatures (-40°C to 120°C), maintaining the seal through decades of thermal cycling and UV exposure to prevent leaks.
-
Guaranteed Penetration & Holding PowerWith clearly classified Tek point options (e.g., Tek 4, Tek 5), our screws provide predictable penetration capacity into steel substrates. This takes the guesswork out of selection, ensuring the screw can drill through the total material stack-up and achieve the minimum 20mm embedment into the purlin for full structural pull-out strength.
| Parameter | Specification | Details / Notes |
| Thread Type | Self-Tapping, AS 3566 Class 4 or Equivalent | Sharp drill point for simultaneous drilling, tapping, and fastening. |
| Head Style | Hex Washer Head (HWH) | Drive Type: Hexagonal head designed for socket or nut driver attachment, providing high-torque transfer and reduced cam-out. |
| Sealing Washer | High-Density EPDM Rubber, Bonded to Steel Washer | Ensures a durable, waterproof and weatherproof seal, resistant to UV exposure and temperature fluctuations (-40°C to +120°C). |
| Core Material | High-Strength, Low-Carbon Steel (Grade 1022A or better) | Provides necessary tensile strength and consistent hardening for the drill point. |
| Corrosion Finish | Option 1: Galvanized (Zinc Plated) | Standard corrosion resistance for general applications. |
| Option 2: Dacromet (Zn-Al Chromate Coating) | Superior corrosion and chemical resistance without hydrogen embrittlement risk. | |
| Option 3: Hot-Dip Galvanized | Heavily coated for enhanced rust protection in harsh environments. | |
| Option 4: Color-Coated Head (e.g., PVDF/Polyester) | Applied over a base coating (e.g., galvanized) for aesthetic color matching and additional weatherability. | |
| Typical Sizes | Diameter: #12 (5.5mm), #14 (6.3mm), etc. | Length: Commonly ranges from 25mm (1") to 100mm (4") or custom. Length is selected based on total material thickness (panel + purlin). |
| Performance Standards | Complies with relevant industry standards for wind uplift resistance and tensile strength. | |
Metal Roof & Wall Cladding Installation: Fastening corrugated steel sheets, trapezoidal panels, and composite sandwich panels to steel purlins or girts in industrial, commercial, and agricultural buildings.
Retrofitting & Repair Work: Securing new metal sheets over existing structures or replacing failed fasteners, providing a reliable hold without requiring pre-drilled holes in the substrate.
Attaching Roofing Accessories: Installing ancillary components such as ridge caps, flashings, gutters, and solar panel mounting brackets directly onto metal roof decks or frames.
A key integrated feature is the sealing washer (typically EPDM), which compresses upon installation to form a watertight seal around the screw shaft, preventing leaks. Combined with corrosion-resistant coatings, these screws provide a complete solution that ensures structural integrity, weather protection, and durability for the entire roofing system.
Get A Quick Qoute
-
1
Q: Do I need to pre-drill holes when using self-tapping roofing screws?
A: No, that is the core function of the screw. A genuine self-tapping roofing screw is equipped with a drill point (often classified as Tek 4, Tek 5, etc.) that penetrates the metal roofing sheet and the underlying steel purlin in one step. This eliminates the need for a separate pre-drilling operation, saving significant labor time and cost. Ensure the screw's point type is rated for the total thickness of the materials you are fastening.
-
2
Q: How does the sealing washer prevent leaks, and how long does it last?
A: The sealing washer, typically made of EPDM rubber, is permanently bonded to the screw's washer head. When the screw is driven to the correct torque, the washer compresses to form a continuous, watertight gasket around the screw shank. Quality EPDM washers are engineered to maintain elasticity and sealing performance across a wide temperature range (typically -40°C to +120°C) and resist UV degradation, providing a reliable seal for the lifespan of the roof (often 20+ years).
-
3
Q: How do I choose the correct screw length for my metal roofing project?
A: The rule of thumb is: Screw Length = Metal Sheet Thickness + Purlin Thickness + Minimum Embedment. The critical factor is ensuring the screw thread engages into the structural purlin by a minimum of 20mm (3/4 inch). For example, for a 0.5mm roof sheet on a 2.0mm purlin, you need at least a 20mm + 2.5mm = 22.5mm long screw, so a 25mm or 30mm screw would be standard choice. Always confirm with engineering specifications.
-
4
Q: What is the difference between standard galvanized and PVDF-coated screws for roofing?
A: The difference lies in corrosion resistance, durability, and aesthetics. Standard Galvanized (Zinc) provides good basic protection, with hot-dip galvanized coatings offering better longevity. PVDF Coating is a superior polymer coating applied over a galvanized base, offering excellent resistance to color fading, chalking, and harsh chemicals. It is the preferred choice for projects requiring long-term color stability and enhanced weatherability.
-
5
Q: What should I do if a roofing screw is over-driven or under-driven?
A: Both scenarios compromise the weatherproof seal. Over-driven: The washer is over-compressed or damaged; remove the screw, fill the hole with sealant, and install a new screw nearby. Under-driven: The washer is not fully compressed; simply re-drive the screw to the correct flush-seated position. Using a drill with an adjustable clutch is key to preventing over-driving.
Keep In Touch
TO KNOW MORE ABOUT Sinsun, PLEASE CONTACT US！
We are committed to providing you with the best quality service and look forward to communicating with you to solve problems together and bring you a better experience.
our experts will solve them in no time.