Self-drilling (Tek) screws drill, tap and fasten steel in one operation without pre-drilling, and we stock the DIN 7504 range in Umm Al Quwain from 3.5 mm to 6.3 mm — hex washer head, pan head and countersunk, Phillips and Torx — in zinc-plated, Ruspert-coated, bi-metal and A2 stainless.
A self-drilling screw has a fluted drill point that bores a hole the right size for its thread, followed by tapping threads and a head. It is designed for steel-to-steel joints — cladding rails, purlins, framing, ducting — and for fixing sheet, plasterboard and timber to steel. DIN 7504 K is the hex head, N the pan head and P the countersunk head; the drill point number (#2 to #5) sets the maximum steel thickness. Winged versions drill oversize through timber or board before biting into the steel.
Applications
- Steel framing, light-gauge studs and tracks
- Cladding rails, purlins and side rails
- HVAC ducting, plenums and units
- Cable tray, trunking and brackets
- Cabin, container and modular construction
- Decking, board and timber to steel (winged)
Standards, grades & finishes
Screws to DIN 7504 K (hex washer head), N (pan head Phillips), P (countersunk Phillips) and ISO 15480 / 15481 / 15482, sizes 3.5, 4.2, 4.8, 5.5, 6.3 mm, lengths 13 to 150 mm, drill points #2 to #5, case-hardened carbon steel zinc plated or Ruspert / zinc flake, bi-metal, stainless A2 / A4. Available with EPDM washers, wings and reamers.
This item is imported from approved mills and held in stock in our Umm Al Quwain warehouse alongside the anchor bolts, studs and plate washers we manufacture ourselves, so complete bolt sets ship from one source. Tensile, hardness and chemical testing is carried out by independent UAE-accredited laboratories, and EN 10204 3.1 certificates are issued with every batch. We supply across the GCC, MENA and Africa.