ORIGINAL: AndyAndrews
These won't work. The amount of torque needed is in excess of 10 lbs.
Well I think you meant force, if so, you are going to have a hard time getting that much force from that cylinder.
In my experience you can only get about 140 psi in these systems without leaking (maybe someone can get more I don't know) and Assuming the drive cylinder ram is 3/8 " diameter you getting about 5 pounds force at 140 PSI.