Stainless Steel Fasteners in Dubai

Grade 304 (also called A2 or 18-8) is the general-purpose stainless steel and performs well in most indoor and mildly corrosive environments. Grade 316 (A4) adds molybdenum, which improves resistance to chlorides such as sea water, de-icing salt and pool chemicals. Near the coast, in marine environments or in chemical areas, choose 316.

Our detailed comparison, written for Dubai's humid climate, is in the guide linked below.

Stainless bolts are marked with a class such as A2-70 or A4-80 (ISO 3506): the letter and number give the steel family and the tensile strength class (70 means 700 MPa minimum, 80 means 800 MPa). Stainless fasteners are generally weaker than 8.8 carbon steel bolts in the common A2-70 class, so do not substitute them in structural joints without checking the design.

Stainless threads can seize (gall) when tightened, especially at speed. Reduce the risk by applying an anti-seize or thread lubricant, tightening slowly and avoiding impact tools. Always reduce torque compared with carbon steel bolts and follow the manufacturer's guidance.

When stainless steel touches a less noble metal such as aluminium or galvanised steel in damp conditions, the other metal can corrode faster. Use isolating washers or sleeves where dissimilar metals meet outdoors.