This project started with part of an old trailer hitch that I’d been saving. I figured that I could use it to build a large capacity vise that could be inserted into a trailer hitch. With a 20” body it can accommodate 17” of material. By using nesting tubes, the dynamic jaw can remain solid as it slides uninterrupted through the static body. The design uses an internal tube with a couple nuts welded to the forward end which allows the lead screw to essentially draw from the rear of the vise versus the midpoint. The design was basically dictated by the pieces of scrap steel that I tend to collect from my local steel mill.