Thought that this might be useful place for this, i couldn't find it here anywhere. (maybe i missed it)
After a frustrating week of trying to bolt my plywood floor down to the stock factory seat and seatbelt anchors of my Ford E350 passenger home build i realize that the bolts and factory floor and wall nuts are a mish-mash of metric and standard. I almost forced 1/2 in bolt into a metric M12 hole.
I'm sure im not the only one wanting to use these to threaded anchors of my build in place with.
Hope this can be a repository of useful thread info.
Seat Belts: Standard 7/16 - 20 threads per inch. These Torx head bolts go into the floor and the walls and the ceiling.
Seat Anchors to the Floor. Metric M12 x 1.75 These are are for the Rubber Torx bolts holding the floor anchors.