Gas Spring Mounting Orientation: Rod Up or Rod Down?

You have your new gas springs. You are ready to install them. But which way is up? Does it matter if the thin rod is pointing up or down?

YES, it matters.

The Golden Rule: Rod Down

In 90% of applications, you should install the gas spring with the Piston Rod facing DOWN (when the lid is in its closed/resting position).

Inside the cylinder, there is a small amount of oil.

Rod Down: The oil sits at the bottom, keeping the main seal (where the rod exits) constantly lubricated. This prevents the seal from drying out and cracking, significantly extending the lifespan.
Rod Up: The oil sits at the bottom of the tube (away from the seal). The seal runs dry, leading to early failure and gas leakage.

Remember the "soft close" effect?

Rod Down: As the rod extends (lid opens), the piston travels through the gas and hits the oil at the very end of the stroke. This oil creates the hydraulic damping that slows the lid down gently.
Rod Up: The piston travels through gas the entire time. The lid will snap open violently at the end of the stroke, potentially damaging hinges.

There are very few exceptions:

Oil Damping Not Wanted: If you specifically want a snappy opening without damping.
Special "Grease Chamber" Springs: Some custom springs are designed with a grease chamber for lubrication, allowing any orientation. Please talk to our enginner for customization if you need mount rod up.

Keep the rod down. It’s the simplest way to double the life of your gas spring and ensure a smooth, professional feel.