September 28, 2020

Fasteners – Hot dip galvanized coatings (ISO + Cor. ); German version EN ISO + AC Buy DIN EN ISO FASTENERS – HOT DIP GALVANIZED COATINGS from SAI Global. Verbindungselemente – Feuerverzinkung (ISO ) mechanical fasteners and accessories”, the secretariat of which is held by DIN.

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What remains is a layer of zinc 40 to 70 microns on the surface of the products that dni relatively thick compared to zinc electroplating 3 to 20 microns. Please first log in with a verified email before subscribing to alerts.

When properly degreased, hot dip galvanizing offers effective adhesion for many types of paint. Subscription pricing is determined by: The large amount of zinc provides excellent corrosion resistance in normal outdoor environments, but with the downside that its layer thickness is significantly above the thread clearance allowance, which this poses a problem for all threaded fasteners.

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BS EN ISO 10684:2004

As the voice of the U. This graphic should be consulted only for rough estimates due to unforeseeable local influences. Add to Alert PDF. Standards Subsctiption may be the perfect solution. This system can offer 1.

Hot dip galvanization | Fabory

The standard specifies material, procedure, dimensions and some performance requirements for hot dip galvanizing of fasteners made of steel with thread. Because zinc is less noble than iron steelthe zinc dissolves first, which protects the steel against corrosion until all of the zinc has dissolved.


We have no amendments or corrections for this standard. This standard is also available to be included in Standards Subscriptions.

The process of hot dip galvanizing is quite simple: At locations where there are gaps in the zinc layer of 1. A white, voluminous zinc corrosion product, “white rust,” may develop, though this product may be less desirable for reasons of aesthetics or painting.

ISO – Fasteners — Hot dip galvanized coatings

Due to the deviation of the thread tolerances, the screw thread of the bolt is allowed to strip at the minimum ultimate tensile load.

The formation of white rust can be suppressed by appropriate storage and packaging or, if necessary, by oiling the zinc or passivating it in chromic acid.

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If the document is revised or amended, you will be notified by email. The two systems must never be mixed, as mixing leads either to fitting problems oversized bolt with ISO fit nut or critical strength reductions of the threaded connection ISO fit bolt with oversized nut.

Another important aspect of cathodic protection is that no corrosion occurs underneath the zinc layer. One solution is a system in which the externally threaded fasteners bolts are manufactured with a larger fundamental deviation such that the thread is made slightly thinner.


The HDG process is commonly regarded as suitable for fasteners with diameters M8 or larger. When galvanized, steel remains wet for a longer period, and there is insufficient air circulation. Standards Subsctiption may be the perfect solution.

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Please first verify your email before subscribing to alerts. Further specific values can be found in DIN Subscription pricing is determined by: Next, the fasteners are spun to remove the excess zinc, and then they are cooled in water to solidify the zinc.

Add to Alert PDF. Already Subscribed to this document. The time that steel remains protected from corrosion is proportional to the thickness of the zinc layer, and it is dependent on the climatic conditions, as shown in the graphic below.