Our gas struts come in a variety of extended lengths from 10" to 36". Both extended and compressed lengths are measured from center of strut socket to center of strut socket.
Our gas struts come in different forces. Your strut should have a Newton rating (i.e., 0500N) on it which can be converted to Pound-Force (lbf). 1 lbf = 4.4482216 N. Using the example above, then, divide 500 by 4.4482216 to determine the lbf. 500N = 112.404472 lbf.