Our Nylon Head Self-Drilling Screws combine a self-drilling tip with an integrated nylon washer, providing all-in-one drilling, tapping, and waterproof sealing. Ideal for metal roofing, wall cladding, and steel structure applications.
Product Details
Name | Self-drilling Screw | Materials | Carbon Steel(1022A) |
Standard | DIN7504 | Head Type | Hex Head |
Point Type | Self-drilling (#2, #3, #4, #5) | Strength level | High-strength |
Size | #6 – #14 (3.5mm – 6.3mm) | Surface finish | ZP/YZP/Dacromet etc. |
Length | 13-150mm | Samples | Available |
Product Parameters

| Thread Size | ST2.9 | ST3.5 | (ST3.9) | ST4.2 | ST4.8 | (ST5.5) | ST6.3 | |
| P | Pitch | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a | max | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| c | min | 0.4 | 0.6 | 0.6 | 0.8 | 0.9 | 1 | 1 |
| dc | max | 6.3 | 8.3 | 8.3 | 8.8 | 10.5 | 11 | 13.5 |
| min | 5.8 | 7.6 | 7.6 | 8.1 | 9.8 | 10 | 12.2 | |
| e | min | 4.28 | 5.96 | 5.96 | 7.59 | 8.71 | 8.71 | 10.95 |
| k | max | 2.8 | 3.4 | 3.4 | 4.1 | 4.3 | 5.4 | 5.9 |
| min | 2.5 | 3 | 3 | 3.6 | 3.8 | 4.8 | 5.3 | |
| kw | min | 1.3 | 1.5 | 1.5 | 1.8 | 2.2 | 2.7 | 3.1 |
| r | max | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 |
| s | max | 4 | 5.5 | 5.5 | 7 | 8 | 8 | 10 |
| min | 3.82 | 5.32 | 5.32 | 6.78 | 7.78 | 7.78 | 9.78 | |
| dp | 2.3 | 2.8 | 3.1 | 3.6 | 4.1 | 4.8 | 5.8 | |
| Drilling range(thickness) | 0.7~1.9 | 0.7~2.25 | 0.7~2.4 | 1.75~3 | 1.75~4.4 | 1.75~5.25 | 2~6 | |
Key Features & Benefits
One-Step Installation: Self-drilling tip eliminates pre-drilling – drills, taps, and fastens in one operation
Waterproof Seal: Bonded nylon washer compresses to prevent water infiltration – perfect for exterior use
Corrosion Resistant: Zinc plated, galvanized, or Dacromet coated for outdoor durability
High Holding Power: Deep threads provide excellent grip in steel substrates
Surface Protection: Nylon head prevents scratching painted metal surfaces
Intended Applications
Metal Roofing: Attaching corrugated steel or aluminum sheets to purlins and structural framing
Wall Cladding: Securing metal wall panels, sandwich panels, and insulated panels
Steel Structures: Fastening flashing, gutters, and trim to steel building frames
HVAC Ductwork: Assembling sheet metal ducting systems
Insulation: Securing insulation boards and vapor barriers
Garages & Sheds: Assembling pre-engineered metal buildings and storage units
Installation Tips
Use variable speed drill at 1500-2500 RPM
Drive perpendicular to surface
Stop when washer compresses slightly – do not over-tighten
Match drill point to material thickness
Why Choose Our Nylon Head Self-Drilling Screws?
Weather-Proof Design: The bonded nylon washer provides reliable water sealing for exterior applications
Standards Compliant: Manufactured to DIN 7504 or ISO 15480 specifications
Comprehensive Range: All standard sizes, drill points, and colors in stock
Corrosion Protection: Multiple finish options for various environmental exposures
Bulk Packaging: Available in boxes or contractor quantities (250, 500, 1000, 5000 pcs)
Custom Colors: Head color matching available for specific project requirements
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