this is my blog about my repstrap project
i have no idea the guy i bought them from did not know, my other choice was some plain black steel ones. the color reminds me of blue lock tite
If you open an OBO Bettermann catalogue, you can find products in it (cable supporting products), which are- FS - Strip galvanised- FS - Strip galvanised bright- FT - Hot-dip galvanised- G - Electrogalvanised- GTP - Electrogalvanised transparently passivatedAnd mabye some more what I missed.All I want to say, that there is no single procedure to galvanise a metal. So the final look will be different.I would really like if you researched the different methods and wrote a summary post about them.Best, Laszlohttp://blog.arcol.hu: http://www.obo-bettermann.com/downloads/en/kataloge/katalog_vbs_en.pdf
They're definitely not hot dip galvanized, that is done only from M10+, because it produces so thick layer. Hot dip galvanized items have very distinctive grey color. Electrogalvanizing(plating) is most common in nuts and bolts from M8 and smaller. I tried to google strip galvanizing, but didn't find anything that got to do with any fasteners.
Perhaps they have been anodized with a very thin coating. Normally I would expect to see a more solid, bright color from that process but who knows?