I'm trying to find a manufacturer who deals with long stroke (36+ inches) cylinders that are in the 100 Ton and above range. Any leads? Everything I find seems to top out around 6 or 12". I'm also looking for Dual Acting.
Off highway equipment use large bore long stroke cylinders. The pressure you are going to operate at will have an effect on bore size and cost.
The Danzco, Inc. link below will provide some information about custom cylinders. If you just need one and want used, look at companies that wreck construction equipment.