Welded Eyelet Gas Springs All our gas springs feature a double seal system. Force limits appy to long stroke springs — max force not available in all springs. 6×15 Welded Eyelet Steel Gas Springs Stroke: 40-250 Extended Length (mm): 152-575 Available Force Range (N,F1): 40-400 8×18 Welded Eyelet Gas Springs Stroke: 50-385 Extended Length (mm): 175-850 Available Force Range (N,F1): 50-700 10×22 Welded Eyelet Gas Springs Stroke: 52-500 Extended Length (mm): 182-1237 Available Force Range (N,F1): 50-1000