The threads are 1/4" in diameter and the head takes a 7/16" socket/wrench. The bolt is 1" long, with the threaded part taking up about 2/3 of the length (.62"-.65") and the shoulder part taking up the other 1/3 (.31"-.35"). The shoulder is about 3/8" in diameter. The built in washer is about 3/4" in diameter. If I had a gram scale, I would have weighed it also (LOL).
View attachment 1715524861
View attachment 1715524862