Self-Drilling Screws (Hex Washer Head, Tek Screws)
Self-drilling screws have a drill point that drills its own hole, then the thread taps and fastens in a single operation — no pilot hole, no separate drilling step. The hex washer head version with a bonded EPDM washer is the standard fixing for metal roofing and wall cladding, where the washer seals the hole against water ingress.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | DIN 7504 K / DIN 7504 L |
| Type | Self-drilling (Tek) screw, hex washer head |
| Size Range | #8 – #14 (4.2mm – 6.3mm diameter) |
| Length Range | 13mm – 100mm |
| Material | Case Hardened Carbon Steel / Stainless Steel SS304, SS316 |
| Surface Finish | Zinc Plated, Ruspert, Dacromet, Stainless Steel |
| Point Type | #1 / #2 / #3 drill point |
| Washer | Bonded EPDM sealing washer |
| MOQ | 500 pcs (standard), 2,000 pcs (custom) |
| Lead Time | 7-15 days (standard), 20-30 days (custom) |
| Packaging | Bulk cartons / Wooden pallets / Custom labeling |
Available Sizes
#8 x 1/2″ to #14 x 4″ (4.2mm, 4.8mm, 5.5mm, 6.3mm diameters)
Applications
- Metal roofing and wall cladding
- Roofing sheets to purlins
- Insulated panel fixing
- Gutters and flashings
- Steel framing and studs
- Container and trailer repair
Certifications
ISO 9001:2015 certified. Material certificates (EN 10204 3.1/3.2). RoHS and REACH compliant.
Frequently Asked Questions
What is the difference between self-drilling and self-tapping screws?
Self-tapping screws cut or form their thread in a pre-drilled or thin material. Self-drilling (Tek) screws add a drill point tip that bores its own hole first, letting them fasten straight into thicker steel with no pilot drilling at all.
What sizes are available?
Available sizes range from #8 – #14 (4.2mm – 6.3mm diameter). Contact us with your required sizes and quantities for a quick quote.
What is the MOQ and lead time?
The MOQ is 500 pcs (standard), 2,000 pcs (custom). Lead time is 7-15 days (standard), 20-30 days (custom). Mixed-size containers and larger orders are negotiable — send us your requirement for a quick quote.
Do you provide material certificates?
Yes. Material test certificates per EN 10204 3.1 are available on request, and our manufacturing is ISO 9001:2015 certified. RoHS and REACH compliance documentation can also be provided.
