Stainless steel gas spring - Materials: Body/rod: stainless steel Rod-end: stainless steel - Works in compression (push) mode - Refilling fluid: nitrogen oil - Working temperature: -20°C to 80°C - Operating Fluids: Nitrogen gas and oil Size 6: approx 10mm Size 10: approx 20mm - Filling tolerance: -20N to +40N Important: Spring must be mounted with piston pointing down Adjustment - Springs are pre-filled to reach the stated force. Gas should be released using the valve to achieve the force required - NOTE once the gas has been released, spring cannot be refilled. Uses - Facilitates opening and closing of a bonnet or boot