Yes it is. The thicker the zinc coating the longer the lifetime. On average, the zinc coating will diminish by 1 μm in cities and light industrial areas with a degree of coastal influence. We follow recommendations in the Swedish normative reference document AMA Hus 08. Our hot-dipped galvanized nails are surface treated with 55 μm zinc and our range of fasteners for outdoor use is hot-dipped galvanized using the TDG method to give zinc coatings of 50 μm.