Gas spring with damper effection Maintenance--free Silence when moving We guarantee 30,000 cyles Easy releasing force

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D (Tube Diameter)	D (Piston Rod Diameter)	M (Thread)	F1 (Minimum Extension Force)
20	6/8	M6/M8	50-1000N
22	8/10	M8/M10	100-1500N
25	8/10	M8/M10	100-2000N
27	8/10	M8/M10	100-3000N
28	8/10	M8/M10	100-3000N

If you want, please let us know the parameters. They're piston rod diameter, tube diameter, stroke, extended length, extension force and end fitting.