I'm trying to install after market running boards on my 2015 F150 Crew Cab. The hardware kit is useless, as my truck has pre - installed screws to attach the brackets. I have been unable to find nuts that fit on the pre-installed bolts. The brackets look like they will git nicely on the bolts.

 

Yes, they will.

 

This is most likely not a troll post, so don't be so mean. The forum now has a new feature demonstrated here that is causing these odd threads. The staff here is working with IB (forum owner) to figure out a better, more productive way to implement this. Until then, please just take it in stride and help to the extent that you can.

 

Thread cleaned.

 

Interesting, so not logged in and ask a question and it creates a post?

Wellto answer the question, the studs are most likely a metric thread of 1.5 pitch, but the diameter will need to be measured.