Gas struts

Danny mentioned that he use 120# gas struts for his hatch, one on each side of the hatch. Does that mean it will push up 120 pounds, or is there a formula that is used?
Jim,
Jim,

rooster wrote:Danny mentioned that he use 120# gas struts for his hatch, one on each side of the hatch. Does that mean it will push up 120 pounds, or is there a formula that is used?
Jim,