Markings on French wood screw

[Anna.p]

Hello
My partner bought loose French wood screws at Bauhaus, they look shiny. He claims the screws are galvanized, which I understand to mean they are electro-galvanized. From what I understand, electro-galvanized screws don't last nearly as long as hot-dip galvanized ones. Does anyone know what the marking is on French screws, sold by weight at Byggmax? And what is the difference between the various markings on hot-dip galvanized screws? We are building a wood deck.

 

[Rickard.]

If it is very shiny and "nice," it is electroplated and is not suitable for outdoor use and definitely not suitable near pressure-treated wood.

If it is matte and somewhat rough in color and texture, it is hot-dip galvanized, which provides significantly better protection. Today, there are better screws available than lag screws with more suitable rust protection for contact with pressure-treated wood.

That said, hot-dip galvanized holds up well unless it's in an extremely exposed environment.

 

[useless]

All French wood screws I have seen have been hot-dip galvanized. Then I don't think there is much of a practical difference between hot-dip galvanized and electro-galvanized in those dimensions.

 

[Anna.p]

Thanks for the response. It is shiny, electro-galvanized just as I thought. Is there any difference with hot-dip galvanized French screws? Do they have different corrosion markings or can I just take any of them? Even the cheap ones at Biltema?

If it is very shiny and "nice," it is electro-galvanized and is not suitable for outdoor use and absolutely not suitable near pressure treated wood.

If it is matte and a bit rough in color and surface, it is hot-dip galvanized, and it provides significantly better protection. Today, there are better screws to choose from than French screws with more suitable rust protection for contact with pressure treated wood.

That being said, hot-dip galvanized lasts long if it is not in an extremely exposed environment.

 

[Anna.p]

All the French wood screws I have seen have been hot-dip galvanized. Then I think there is not much of a practical difference between hot-dip galvanized and galvanized in those dimensions.

Found that guide. Seems to be a big difference between these two surface treatments.

 

[Markus P]

Isn't it that they are in stainless steel then? It is also shiny, but maybe somewhat "grayer" in color.

 

[Anna.p]

Isn't it that they are stainless steel then? It's also shiny, but maybe somewhat "grayer" in color.

Doesn't seem like it, he says they are galvanized. And the price is quite low, stainless steel would probably be more expensive. Bauhaus's website shows hot-dip galvanized C3, and Biltema's also seems to be C3. Wonder if that's enough or if one should look for C4