Every European distributor we supply asks the same question: which screw actually survives outdoors? The honest answer isn't "the cheapest one" — it's about material, coating and thread design working together. As a screw factory, here's how we guide buyers.
Outside, a screw fights rain, humidity, UV and the chemicals in treated timber. Plain untreated steel fails fast under repeated wet–dry cycles — surface rust spreads, strength drops, and the joint lets go. For any external job you need three things: corrosion resistance, enough strength, and a drive that won't cam out.
1. Stainless steel (A2 / A4) Chromium in the steel forms a self-healing passive layer, so it resists rust even when scratched. A2 (304) covers most outdoor work; A4 (316) is the call for coastal and marine sites where salt air is constant. Best where the screw stays visible and good-looking.
2. Galvanised (zinc-coated) A zinc layer sacrifices itself before the steel does. Ideal with pressure-treated timber, which is corrosive to bare fasteners. Hot-dip galvanising is the heavy-duty choice for structural outdoor work.
3. Decking / timber screws Built for outdoor wood and the chemicals in pressure-treated boards. Supplied in stainless or coated carbon steel, with a coarse thread that bites hard and stays put.
Our Tianyu outdoor screws use hardened carbon steel with a corrosion-resistant coating (black or silver option), a combined twin/single thread for fast, even driving, and Pozi or Torx drives so the head sits flush without slip-out. We supply distributors by the box or pallet, and accept custom orders on material, coating, thread form and drive type.
We're a screw factory supplying European distributors and OEMs. Send us your application, drawing or sample and we'll match it, prototype, and quote — every batch ships with an MTC on request.
Contact us now for samples: support1@tianyufasteners.com. Explore our offerings at www.tianyufasteners.com.
Q: Which screw do you recommend for coastal or marine European projects? A: For salty, high-humidity sites we recommend A4 (316) stainless or our salt-spray-tested coated screws. Plain zinc won't hold up long term in that environment.
Q: Can you supply outdoor screws to our spec or coating requirement? A: Yes. As a factory we accept custom orders on material, coating (including our black/silver corrosion-resistant finish), thread form and drive type — from drawing or sample.
Q: How do you prevent galvanic corrosion in mixed-material assemblies? A: We advise matching the screw alloy to your substrate (e.g. stainless with aluminium where needed) and can recommend the right grade for your Bill of Materials.
Q: What documents support a European shipment? A: Every batch ships with a Material Test Certificate, plus salt-spray and dimensional reports on request for your compliance file.