UNE-EN ISO 4042:2019

This International Standard specifies requirements for electroplated coatings and coating systems on steel fasteners. The requirements related to dimensional properties also apply to fasteners made of copper or copper alloys.

This International Standard also specifies requirements and gives recommendations to minimize the risk of hydrogen embrittlement, see 4.4 and Annex B.

This International Standard mainly applies to zinc and zinc alloy coating systems (zinc, zinc-iron, zincnickel) and cadmium, primarily intended for corrosion protection and other functional properties:

with or without conversion coating;

with or without sealant;

with or without top coat;

with or without lubricant (integral lubricant and/or subsequently added lubricant).

Specifications for other electroplated coatings and coating systems (tin, tin-zinc, copper-tin, coppersilver, copper, silver, copper-zinc, nickel, nickel-chromium, copper-nickel, copper-nickel-chromium) are included in this standard only for dimensional requirements related to fasteners with ISO metric threads.

National regulations for the restriction or prohibition of certain chemical elements and compounds shall be taken into account in the countries or regions concerned.

Although other ISO standards specify various electroplating processes, the requirements of this International Standard supersede other ISO standards for electroplating of fasteners, unless otherwise agreed at the time of the order.

This International Standard applies to bolts, screws, studs and nuts with ISO metric thread, to fasteners with non-ISO metric thread, and to non-threaded fasteners such as washers, pins, clips and rivets.

Information for design and assembly of coated fasteners is given in Annex A.

This International Standard does not specify requirements for properties such as weldability or paintability.