I am in a mess with the legs of my ottoman which I want to make shorter. It seems while every furniture leg I can find has the same bolt width of 5/16/M8/7.7mm mine is the odd one out with a TPI of 16 where every other foot I've seen/ordered has 20 TPI.

This seems to be so standard that no one mentions in their listings the TPI of their bolts.

I am hoping for a way to avoid having to install new hardware into the ottoman mostly because I dont love the idea of cutting into fabric on the bottom and I dont have a staple gun to put it in securely like they did.

I realize that a 20TPI socket could not fit within a 16 TPI bolt so the goal would be that they are sort of stacked. The part goes into the 16 TPI socket and immediately comes out to a 20 TPI socket I can screw standard screw into.

Even when I look at just installing my own hanger bolt into a block of wood the desired size most of the listings dont list the pitch/TPI of the bolt portion. I am guessing my furnitures 16 TPI is out of standard.

Additional detail I used a thread pitch measure my 20 TPI bolt measured 18G. And the other feet I find show 20G. I don't quite know what this means.

Open to other solutions.

Edit: The answer was it was a 5/16" bolt with TPI. Turns out metric and imperial have very different "thread pitches" per the same size.