Chemical Black Finish Screws, Fasteners and Fixings
A chemical black finish is also referred to as black oxide or blackening. It is a ‘conversion coating’, which is a coating for metal where the surface of the part is subjected to a chemical or electrochemical process by the coating material, converting it into a decorative or protective substance.
Chemical blackening is often used on fasteners made from stainless steel, copper, copper based alloys and zinc.
Benefits of the process include the addition of mild corrosion resistance, improves aesthetic appearance and the minimising of light reflection. Maximal corrosion resistance can be achieved when the oxide is impregnated with oil or wax.
A chemical black finish with stainless steel uses hot black oxide which is a mixture of caustic, oxidising and sulfur salts, and can be used on cast iron and low-carbon steel. There is also room-temperature blackening for stainless steel, which offers less abrasion resistance but similar corrosion protection as a hot blackening process.
The process essentially involves embedding a pigment into the fixing which unlike paint or plating, does not alter the precise dimensions or surface texture.
The vast majority of stainless steel fasteners can be chemically blacked upon request.
If you require more information or would like to order a product in black oxide, please contact us.
Kitting and Packaging Service
Ideal for the furniture trade, we specialise in the supply of heat seal, grip seal and zip seal bags of screws and fasteners for your application.
Specials and non standard fixings
Looking for fixings with an unusual head diameter or thread length?
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Fastener Terminology Glossary
There are a number of confusing names and terms within the Fastener industry, so we have created a handy terminology glossary to help.