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- Self-drilling, hex washer head
- Bonded EPDM sealing washers
- Corrosion class 3 and 4 (AS 3566)
- For steel up to 12 mm and timber
- Stitching screws and blind rivets
- Colour-matched heads on request
What it is
Roof and wall sheets are fixed to purlins and girts with self-drilling screws that drill, tap and seal in one operation. The bonded EPDM washer seals the hole; the drill point is chosen for the purlin thickness.
World Steel supplies screws with the roof and wall sheeting and calculates the quantity from the sheet layout and the wind-zone fixing pattern.
Range
| Fastener | Typical size | Use |
|---|---|---|
| Roof screw (crest fixed) | 12-14 × 55 – 65 mm | Sheeting to steel purlins 1.5 – 3 mm |
| Wall screw (valley fixed) | 12-14 × 20 – 25 mm | Wall sheeting to girts |
| Heavy-section screw | 12-24 × 32 – 45 mm | Steel 4.5 – 12 mm |
| Stitching screw | 14 × 20 mm | Side laps, flashings |
| Blind rivet | 4.8 mm sealed | Flashings and trims |
Corrosion class
Coastal and industrial sites need class 4 coatings or stainless steel; class 3 is common elsewhere. The screw must outlast the sheet coating.
Standards and requirements by market
Codes World Steel designs, fabricates and documents this product to – and the key geometric and load requirements in each market.
Australia / NZ
- AS 3566.1 / .2Self-drilling screws – requirements and corrosion
Summary for orientation only – the project specification, the adopted code edition and the authority having jurisdiction govern.
Finishes
| Finish | Standards / notes |
|---|---|
| Class 3 / 4 | Organic and zinc-alloy coatings |
| Stainless | A2 / A4 for severe environments |
