This is a bolt and nut with 5/16-18 threads. Also included a single thread for the OD thread and the ID thread so anyone can make whatever thread length they want to. These threads are not made to exact machined thread tolerences as thats not enough clearance for my printer to print succssfully.
4/11. I remade the threads to be a little closer to true machined thread dimensions. Its a little more acurate and i had no problem screwing the printed bolt and nut together.
I will try and make some more bolts and nuts with different sizes and maybe even some common metrics as i get time.