Challenge Europe team re-screw materials and finishes

11 May 2020

The Challenge Europe team is used to deal with questions of specification regarding materials and finishes of threaded fasteners. This preferably occurs early in the process of defining new assemblies, but may equally be of value at service or repair. 

In truth, screws and nuts may be produced in so many materials and alloys from mild steel, high tensile steels, stainless steels, brass, nylon, copper, titanium, duplex stainless steels, exotics such as Inconel, Incoloy, Monel, Hastelloy, Zirconium, Molybdenum, Tantalum, Waspaloy, Tungsten, Silicon Bronze, Aluminium, Ferralium, Polyoxymethylene and even Fibreglass or glass reinforced plastics.

Typically, these finishes are most applicable to steels because of their ability to change the properties of screws made from this low-cost material. Primarily aimed at improving corrosion resistance or changing appearance, the most common include zinc, occasionally cadmium, also black japanned, chemical black, chrome, electro brass, copper, stayblack or powder coating. Chromate conversion coatings are often used as part of the plating process to passivate the coated surface which enhances corrosion protection and can add a decorative effect in the cases of zinc & yellow and zinc & black.

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