The hinges with the stock plastic lines and stock pump pressure settings are good up to 125 lbs. They are capable of lifting much more, but you have to keep in mind the leverage point of where they're lifting. Lifting a 125 lb hatch from the rear 12" of a hatch that is 48" long is actually equivilant to lifting over 300 lbs. The shorter the hatch, the easier it is to lift. You can step up to the full braided line set where we also set the pump pressure higher making the lifting capacity 155 lbs. We are in the process of developing a monster version of these hinges for larger twin engine applications.