Attwood Stainless Steel Gas Spring, 20 Inch x 12mm, 30 lb Force, ST34-30-5

The Attwood ST34-30-5 is a stainless steel gas spring built to hold marine hatches, deck lids, and storage compartments open smoothly and safely. Gas springs like this one use a pressurized cylinder to provide consistent, controlled resistance as a hatch or lid is raised, then hold it in the open position without the need for a separate prop rod or latch. This unit is rated at 30 pounds of force and measures 20 inches by 12 millimeters, sizing it for mid-size hatch lids and compartment doors commonly found on boats, though the same style of gas spring is also used on truck caps, RV storage doors, and other lift-and-hold applications.

Constructed of stainless steel, the ST34-30-5 is built to resist corrosion in the marine environment, standing up to saltwater spray, humidity, and UV exposure better than painted or plated steel alternatives. Stainless construction also means the exposed rod and cylinder body keep a clean, consistent finish over years of outdoor use. At 0.6666 pounds, it is light enough to mount without adding meaningful weight to a hatch assembly, while still delivering the 30 lb force rating needed to lift and support the lid it is paired with.

Gas springs are a wear item, and the ST34-30-5 is sized to serve as a direct replacement when an existing 20 inch, 30 lb unit has lost pressure or begun to weep fluid. Two brackets (ball studs or eyelets, per the original hatch hardware) are used at each end to mount the cylinder between the hatch and the surrounding structure.

Specifications

• Brand: Attwood
• Manufacturer Part Number: ST34-30-5
• Material: Stainless Steel
• Extended Length: 20 inches
• Rod Diameter: 12 millimeters
• Force Rating: 30 pounds
• Weight: 0.6666 pounds
• UPC: 022697343055
• Category: Boat Hatches and Adjusters

Frequently Asked Questions

What is the force rating of the Attwood ST34-30-5 gas spring? The Attwood ST34-30-5 is rated at 30 pounds of force, which is the amount of lift and hold-open support it provides for a hatch or lid.

What size is the ST34-30-5 gas spring? It measures 20 inches in extended length with a 12 millimeter rod diameter, making it a mid-size gas spring suited to hatch lids and compartment doors sized for that stroke length.

Is the Attwood ST34-30-5 made of stainless steel? Yes, the ST34-30-5 is constructed of stainless steel, which resists corrosion from saltwater spray, humidity, and UV exposure in a marine environment.

How much does the ST34-30-5 gas spring weigh? This Attwood gas spring weighs 0.6666 pounds.

Can the ST34-30-5 be used on something other than a boat hatch? Yes, gas springs of this size and force rating are also commonly used on truck caps, RV storage doors, and other lift-and-hold applications, though the Attwood ST34-30-5 is categorized as a boat hatch adjuster.

Does the ST34-30-5 include mounting brackets? The ST34-30-5 is the gas spring cylinder itself; mounting hardware such as ball studs or eyelets is matched to the existing hatch brackets on the boat.

What is a gas spring used for on a boat hatch? A gas spring like the ST34-30-5 uses a pressurized cylinder to smoothly lift a hatch or lid and hold it open, eliminating the need for a separate prop rod.

How do I know if the ST34-30-5 is the right replacement for my old gas spring? Match the extended length (20 inches), rod diameter (12 millimeters), and force rating (30 pounds) of your existing gas spring to the Attwood ST34-30-5 specifications before ordering.

Why would a gas spring need to be replaced? Gas springs lose internal pressure over time or can develop a fluid leak, causing a hatch to no longer stay open on its own; the ST34-30-5 is sized to serve as a direct replacement in those cases.

What is the UPC for the Attwood ST34-30-5? The UPC for the Attwood ST34-30-5 stainless steel gas spring is 022697343055.