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Self Colour / Black Finish Finish Specification S/C Self Colour Bare / Blackened (Black Oxide) Lightly Oiled products are supplied in a black finish with a light covering of oil Hot Dip Galvanised (HDG) Finish Specification HDG Hot Dip Galvanised EN ISO 10684 EN 1461 BS 7371-6 heavy coating deposits of molten zinc (40-180 microns) suitable for long term corrosion protection; a thicker coating deposit gives a longer life expectancy; it is most suitable for structural steelwork; the coating will affect the thread fit and assembly of fasteners due to the non-uniformity of the coating and the average coating thickness of 50-80 microns; in general the fullnuts are tapped oversize after the plating to allow for this but in some cases the bolt threads are undersize prior to coating; high temperature may affect the metallurgical properties of high tensile metals, i.
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