Zinc Plated Metal Roofing Tek Screws Hex Head Self Drilling EPDM Washer
Drive at a consistent speed to allow the self-drilling point to cut cleanly, then compress the EPDM washer firmly for a weatherproof seal.
Achieve guaranteed, professional-grade fastening for all your exterior metal construction projects, including roofing, cladding and sheet metal assembly.
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Self-Drilling Point
Pierces, taps and fastens thin steel sheet in one pass, with no pre-drilling required in typical roofing/cladding gauges.
DIN 7504-K Profile
The recognised head/point pattern for hex-washer-head self-drilling screws.
Bonded EPDM Washer
Forms a weatherproof seal around every fixing point and accommodates a small amount of thermal movement without losing its seal.
Hex Washer Head
8mm across-flats drive suits a standard nut-setter on an impact driver or variable-speed drill.
Zinc-Plated Finish
Corrosion protection on both the screw and the metal component beneath the washer.
Full-Length Thread
Consistent pull-out resistance along the whole shank rather than just the tip.
CE Marked
Assessed under a European Technical Assessment. The torque value should be determined experimentally before installation.
Three Lengths in Stock
4.8mm x 20mm, 35mm and 50mm, covering a range of sheet-to-purlin/timber thickness combinations.
Technical Specification
| Screw Type | Hex Washer Head, Self-Drilling (Tek) |
| Head/Point Profile | DIN 7504-K |
| Thread Diameter | 4.8mm / 0.19in (No. 10 gauge) |
| Head/Washer Diameter | 14mm / 0.55in |
| Head Height | 5mm / 0.20in |
| Hex Drive Size | 8mm Across Flats |
| Material | Steel, Hardened at Drill Point |
| Finish | Zinc Plated |
| CE Marking | Yes, under a European Technical Assessment |
| 4.8x20mm (0.79in) | Length |
| 4.8x35mm (1.38in) | Length |
| 4.8x50mm (1.97in) | Length |
