Get The Kernow-How On Common Fixing Finishes

With many technical and innovative products now available to contractors, it can be easy to overlook the basic products such as the humble nut & bolt. Ordering these incorrectly, such as selecting the incorrect finish for your application can result in problems or failures further down the line. So with this in mind, here’s a quick recap of some of the common fixing finishes available.


 
BZP (Bright Zinc Plated)

A low cost option ideal for indoor applications. BZP products are coated with a thin layer of zinc added by way of an electric current. This ensures a good level of moisture resistance preventing rusting & oxidation, although given this coating is only thin, it is not recommended for use outdoors. BZP has a bright & shiny appearance making it aesthetically pleasing.

HDG (Hot Dip Galvanised)

Offering a higher degree of protection over BZP whilst remaining a very cost-effective option, HDG fixings are dipped in a bath of molten zinc which bonds to the fixing providing a strong level of protection. This makes it ideal for use in outdoor applications, although it’s dull finish is not as visually pleasing as BZP or Stainless Steel.

It is worth noting that when you cut a galvanised product, you’ll cut through the protective layer exposing unprotected metal, therefore a galvanising spray should be used to maintain protection.

A2 Stainless Steel (304)

The most common grade of stainless steel fastener well known for its bright finish, high strength and strong rust resistance. It is often used in outdoor applications, where a higher level of protection is required over HDG, or in areas where hygiene is important due to its non-porous surface. It is worth nothing that A2 stainless can tarnish and rust over time if used in an overly corrosive environment.

A4 Stainless Steel (316)

Often referred to as ‘Marine Grade’, A4 stainless steel offers some of the highest levels of resistance against corrosion and tarnishing making it ideal for use in marine or corrosive environments. It is identical in appearance to A2 stainless steel and retains all the same benefits, but offers an even greater levels of rust resistance.

Nylon

Lightweight and ideal for those environments where metal fixings can’t be used. Nylon fixings won’t rust and are inert to most chemicals making them ideal for use in harsh chemical environments such as near swimming pools. Being non-magnetic & non-conductive, nylon is also one of the few fixing materials which is safe to use in areas containing sensitive electronic equipment. Finally, with their sanitary properties they're also suitable for hygienic environments such as food processing areas.

Brass

Brass fixings are commonly used in electrical installations due to their low levels of conductivity, perfect for applications such as securing earth connections. In addition to this, brass fixings are extremely resistant to corrosion, making them a viable alternative for use in external and marine environments. It is worth noting that brass is a softer material, so care should be taken when installing.

Remember: Whatever bolt finish you use, it is imperative you select the same finish for any nuts and washers to avoid any unwanted corrosion or reaction.

If you need a hand in selecting the correct fixing, do get in touch! Our team are on hand to help ensure you have the Kernow-How when it comes to fixings!