Which Coating?
Fasteners are often produced in a range of coating options. Coating affects the durability and cosmetic finish of a product. Below is a brief run through of the options available from us.
Black/Self Colour/Unplated
Black in colour, they are generally used on nuts, washers, screws and bolts that are most likely to be welded
Zinc Plating
The process that involves an electrolytic application of zinc to metal. This produces oxidation of the protected metal, and the zinc coating acts as a barrier to corrosion.
Bright Zinc Plated
The most common, silver looking, and provides effective corrosion protection on steel fasteners.
Zinc Black
A zinc plating is applied with a black passivate on steel fasteners to provide corrosion resistance and a cosmetic look for applications of the same colour. There are a number of zinc alloy processes that are available; zinc-iron, zinc-cobalt, zinc-nickel, zinc-tin alloy.
Zinc Yellow Passivate (ZYP)
This coating is achieved using the same method as Zinc Black but with different alloys to achieve a particular cosmetic look.
Brass
Highly corrosion resistant and is electrically conductive. Primarily copper and zinc alloy. Generally available in most metric and imperial sizes. Be warned – the price can be volatile!
Nickel
Similar to bright zinc but slightly more of a yellow tint and very shiny and smooth. Very hard wearing and durable. Mostly used on machine screws.
Phos Oil
Dark grey plating for steel parts for corrosion resistance and lubricity.
Cadmium
Old style plating which offers protection from corrosion and resists the growth of mould and bacteria. No longer commonly used.
A2 Stainless Steel
Most common stainless steel A2(304). Offers excellent corrosion resistance for most applications. Widely available in metric and imperial.
A4 Stainless Steel
Marine grade A4(316). Offers increased resistance to chloride corrosion compared to A2(304). Widely available in metric sizes and can be sourced in imperial threads.
A4-80 Stainless Steel
The same as A4 but a higher grade. Only available in metric sizes.
Galvanised
Similar process as Zinc plating but a thicker layer is applied. Has a higher corrosive resistance than zinc. Commonly used in agriculture and marine industries.
Get In Touch!
Opening Hours
FRIDAY 8.30AM-1.00PM
Address
FORD, ARUNDEL, BN18 0DF
Latest Blog
How to Calculate Thread Length on a Bolt
At Arun Fasteners we are often asked about the thread length on differing size Hex Head Bolts. Below is a helpful guide. NOTE: It is
British Steel Fasteners from the Alvis Military Factory
New stock In 2021 we were lucky enough to purchase 8 tonnes of British steel fasteners. Approached by a farmer’s family in Cheshire, and
WE ARE RECRUITING – Warehouse Team Member
WE ARE RECRUITING! – Warehouse team Member We are a small family run fastener company in Ford, Sussex. We are looking for a part time
Which Allen Key should I use for the Socket Screw I am using?
We are often asked what size hex Allen key wrench will fit a certain socket screw. Below is a conversion chart to help: Metric Socket
High Tensile Grades
Most metric High Tensile (HT) nuts and bolts are produced in three grades, with the exception of mild steel. Mild steel Grade 4.8 is the
Address
FORD, ARUNDEL, BN18 0DF
