View the thread, titled "What fastners you using?" which is posted in Solar PV Forum | Solar Panels Forum on Electricians Forums.

We been using SS coach screws, but sometimes they dont grab perfectly as i feel the thread isnt deep enough.

What do you use? and why?
 
We use Hilti screws alongside the Hilti mounting system. This is due to them being one of the only companies that I know of that offer a full guarantee with their mounting systems. Other mounting system manufactures guarantees are affected depending on which screws/coach bolts you use alongside them. Before we found this out we were using decking screws from Travis Perkins as these felt strong and reliable. Plus with both of these products you don't have to pre drill holes
 

Reply to the thread, titled "What fastners you using?" which is posted in Solar PV Forum | Solar Panels Forum on Electricians Forums.

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