Product Introduction
Self-drilling screws are professional fasteners engineered for fixing FRP daylighting panels, metal roofing sheets and sandwich panels to steel purlins. Featuring a TEKS drill point, hex flange head and EPDM sealing washer, they drill, tap and fasten in one single operation - no pre-drilling required. As a natural accessory to our FRP panels, they deliver a watertight, corrosion-resistant and long-lasting roof cladding system that keeps factory roofs and skylights leak-free for decades.
Product Structure
TEKS Self-Drilling Point A drill-bit shaped tip that drills through steel up to 12.5 mm (varies by diameter), taps the thread and seats the fastener in one operation - no pilot hole needed.
High-Grip Dual Thread Two threaded sections separated by a smooth plain shank - a short thread below the washer and a longer main thread near the point - grip the panel firmly, delivering strong pull-out resistance and preventing panel "oil-canning" under foot traffic. Reamer wings at the top of the main thread widen the hole when driving through wood or plastic, so the plain shank passes without binding.
Hex Flange Head One-piece forged head with an integrated flange; drives with a standard socket, and the flange spreads clamping pressure evenly across the panel surface.
EPDM Sealing Washer A one-piece EPDM rubber washer seated under the flange; compresses into a permanent waterproof seal, blocking rain and preventing galvanic corrosion between screw and metal.
Key Advantages
One-Step Self-Drilling, No Pre-Drilling The TEKS drill point drills through steel up to 12.5 mm thick (depending on screw diameter and specification), taps the thread and seats the fastener in one operation - saving up to 50% installation time compared with traditional bolt-and-drill methods, while eliminating alignment errors.
Leak-Proof EPDM Sealing Washer Each screw is fitted with an EPDM washer seated under the hex flange that compresses to form a permanent waterproof seal around the hole. It prevents rain leakage, blocks galvanic corrosion between the screw and metal sheet, and stays elastic across a wide outdoor temperature range for long-term performance.
Superior Corrosion Resistance Multi-layer zinc-aluminum-magnesium anti-corrosion coating provides long-term salt spray resistance, making the screws ideal for coastal areas, chemical plants and humid environments where ordinary zinc-plated screws fail quickly.
Anti-Loosening Thread Design The dual-thread design - short threads below the washer and longer main threads near the point, separated by a plain shank - delivers strong pull-out resistance and prevents panel "oil-canning" (denting) under foot traffic during installation and maintenance.
Perfect Match with FRP Panels Engineered to work with FRP daylighting sheets, metal sheets, and sandwich panels - proper drilling torque prevents FRP cracking at the hole, a common failure with ordinary screws.
Technical Specifications
| Item | Specification |
|---|---|
| Screw Diameter | No.10 (4.8 mm) / No.12 (5.5 mm) / No.14 (6.3 mm) |
| Length | 20–120 mm (customizable) |
| Head Type | Hex flange head (one-piece flange) |
| Drill Point | TEKS self-drilling point; drilling capacity varies by diameter (e.g. ≤ 2.4 / 4.5 / 6.0 / up to 12.5 mm steel) |
| Thread | Partial thread standard - dual-thread with plain shank (short thread + main thread + reamer wings); full thread available |
| Sealing Washer | EPDM sealing washer under hex flange (black); aluminum or stainless steel washer optional |
| Coating | Zinc plated / zinc-aluminum-magnesium anti-corrosion coating / stainless steel 304 & 316 |
| Drive Type | Socket drive (8 mm / 10 mm) |
| Standards | Third-party test reports and certification support available on request |
| Working Temp. | Wide outdoor temperature range (EPDM washer stays elastic in heat and cold) |
| Packaging | Carton, 100–1,000 pcs/box, custom packing on request |
Application Scenarios
Fixing rock wool / PU sandwich panels for roofs and walls of cold rooms, clean rooms and industrial plants, with sealing washers protecting the panel surface from damage.
FAQ
Q: Do I need to pre-drill holes before installing these screws?
A: No. The TEKS drill point drills through steel up to 12.5 mm thick (depending on screw diameter and specification), taps the thread and seats the fastener in one operation - saving up to 50% installation time with no pilot holes required.
Q: What is the difference between self-drilling and self-tapping screws?
A: A self-tapping screw only cuts threads and usually needs a pilot hole in metal. A self-drilling screw has an integrated drill point that drills, taps and fastens in one step - our screws are self-drilling type, the best choice for FRP panels, metal sheets and sandwich panels.
Q: Will the EPDM washer prevent roof leakage?
A: Yes. The EPDM washer seated under the hex flange compresses into a permanent waterproof seal around the hole, blocks rain penetration and prevents galvanic corrosion between the screw and metal sheet, staying elastic across a wide outdoor temperature range.
Q: Are these screws suitable for fixing FRP daylighting panels?
A: Absolutely. They are engineered as the matching fastener for our FRP panels - the drill point and controlled torque prevent FRP cracking at the hole, a common failure with ordinary screws, and the sealing washer keeps every fastener watertight for the panel's full service life.
Q: How long do the screws last outdoors in coastal or chemical environments?
A: The multi-layer anti-corrosion coating provides long-term salt spray resistance, and stainless steel (304/316) versions are available for coastal and acid/alkali atmospheres, ensuring no rust streaks for long-term service.
Q: Can I get custom sizes, coatings or packaging?
A: Please contact our sales team to discuss your specific requirements - diameters, lengths, coatings and packaging options can be confirmed based on your project needs.
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