we can supply Locking gas spring Here are brief introduction of our company: Leading Manufacturer of gas springs based in China. Free custom made locking gas spring sample before order within 7 days. S: means stroke length F1:means Extension Force Tube:means Tube diameter Rod:means Rod diater 1.1 S(20mm-550mm) 1.2 F1(30N-1150N) 1.3:Tube 22mm 1.4 Rod 10 mm 2.1 S(20mm-500mm) 2.2 F1(30N-2100N) 2.3:Tube 26mm 2.4 Rod 10 mm