GI bolts — hot-dip galvanized mild steel hex bolts in grade 4.6 — are the everyday outdoor fastener on Gulf sites, and we keep a deep stock in Umm Al Quwain from M6 to M64 and ¼" to 2", with galvanized nuts and washers, in full and half thread.
A GI hex bolt is a low-carbon (mild) steel bolt, property class 4.6 or 5.6, coated by hot-dip galvanizing to give a thick zinc layer that protects against rust for decades outdoors. Because the coating is thick the nut is tapped oversize to fit. GI bolts are used where corrosion resistance matters more than strength: fencing, towers, guard rails, cable trays and general steelwork.
Applications
- Fencing, gates and boundary walls
- Transmission, telecom and lighting towers
- Guard rails and highway furniture
- Cable trays, ladders and supports
- Roofing, cladding and purlin bolts
- Water tanks, pipelines and outdoor structures
Standards, grades & finishes
Bolts to DIN 931 / 933 / ISO 4014 / 4017 / BS 4190, property class 4.6 and 5.6 to ISO 898-1 (Grade A / 2 imperial), hot-dip galvanized to ISO 10684 / ASTM F2329 / BS 7371-6 with minimum 45 µm zinc. Nuts ISO 4032 class 5 tapped oversize; washers DIN 125A galvanized. Also available in 8.8 HDG.
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.