Hi Ben. Shiny parts ….nice! 
Servicebox has an odd way of describing screw & thread sizes. DIAM 6x100-16 refers to a 16mm long bolt with an M6 x 1.0 thread. (Thread pitches are normally described as 1.0, 1.25, 1.5, 1.75 etc, NOT the way they are shown in Servicebox).
Good ol' Wikipedia gives you a list of the pitch sizes for standard & fine threads for each metric bolt/nut size. https://en.wikipedia.org/wiki/ISO_metric_screw_thread There are also such things as extra fine threads. A thread pitch gauge is a useful tool & only cost a few quid on eBay.
Stainless steel caps head bolts would probably be fine for the dust shields but most stainless steel isn't as strong as a high tensile 8.8 grade bolt which is generally considered the minimum for automotive use. I ordered some zinc plated socket head cap screws from here for the shields https://www.westfieldfasteners.co.uk/BZP...ap_M6.html . They do them in 16mm length, are 12.9 grade (overkill!!!) and only £3.31 for 30! (although they charge for postage).
As for electrolysis, it can apparently cause hydrogen embrittlement but it's only really an issue with higher tensile steels. I did quite a lot of reading about it and some of the texts are way too technical and went over my head. You may want to look for yourself, but essentially high tensile parts should be heat treated after electrolysis to drive the hydrogen out of the metal. This applies to rust removal and electro-plating.
Servicebox has an odd way of describing screw & thread sizes. DIAM 6x100-16 refers to a 16mm long bolt with an M6 x 1.0 thread. (Thread pitches are normally described as 1.0, 1.25, 1.5, 1.75 etc, NOT the way they are shown in Servicebox).
Good ol' Wikipedia gives you a list of the pitch sizes for standard & fine threads for each metric bolt/nut size. https://en.wikipedia.org/wiki/ISO_metric_screw_thread There are also such things as extra fine threads. A thread pitch gauge is a useful tool & only cost a few quid on eBay.
Stainless steel caps head bolts would probably be fine for the dust shields but most stainless steel isn't as strong as a high tensile 8.8 grade bolt which is generally considered the minimum for automotive use. I ordered some zinc plated socket head cap screws from here for the shields https://www.westfieldfasteners.co.uk/BZP...ap_M6.html . They do them in 16mm length, are 12.9 grade (overkill!!!) and only £3.31 for 30! (although they charge for postage).
As for electrolysis, it can apparently cause hydrogen embrittlement but it's only really an issue with higher tensile steels. I did quite a lot of reading about it and some of the texts are way too technical and went over my head. You may want to look for yourself, but essentially high tensile parts should be heat treated after electrolysis to drive the hydrogen out of the metal. This applies to rust removal and electro-plating.