What are these Attwood gas springs used for?

They are stainless steel gas springs used to hold boat hatches, deck lids, livewell covers, and line lockers open, providing consistent lifting force so lids stay open without manual bracing.

How do I pick the right size or force rating for my hatch?

Choose the 40 lb ST30-40-5 for smaller or lighter hatches and lids, and the 60 lb ST33-60-5 for larger or heavier hatches. Match the extended and compressed lengths to your existing strut or the mounting distance available for the best fit.

What is the difference between the ST30-40-5 and the ST33-60-5?

The ST30-40-5 provides 40 pounds of force with a 10 inch extended / 7 inch compressed length, while the ST33-60-5 provides 60 pounds of force with a 15 inch extended / 9.5 inch compressed length. The ST33-60-5 is longer and stronger, suited to larger hatches.

Are these gas springs suitable for saltwater use?

Yes. Both the ST30-40-5 and ST33-60-5 use #316 stainless steel pressure tubes and rods, a marine-grade alloy chosen for resistance to saltwater corrosion.

What rod diameter and socket type do these gas springs use?

Both models use an 8 mm rod with a 10 mm composite socket type.

Can I replace my existing hatch strut with one of these?

Yes, as long as the extended length, compressed length, and force rating match your original strut, either the ST30-40-5 or ST33-60-5 can be used as a direct replacement.

How much do these gas springs weigh?

The ST33-60-5 weighs approximately 0.552 pounds; the ST30-40-5 is proportionally lighter due to its shorter length and lower force rating.

What color or finish do these gas springs come in?

Both models have a silver stainless steel finish.

Attwood Stainless Steel Gas Springs - 40 lb & 60 lb

Attwood Stainless Steel Gas Springs for Hatches & Deck Lids - Available in 40 lb and 60 lb

$35.69

Attwood Stainless Steel Gas Springs are marine-grade lift supports engineered to hold boat hatches, deck lids, livewell covers, and line lockers securely open with smooth, consistent force. Built with #316 stainless steel pressure tubes and rods paired with corrosion-resistant marine composite end fittings, these gas springs are designed to perform reliably in demanding saltwater and freshwater environments alike. Whether you are replacing a worn-out strut or upgrading a hatch that will not stay open on its own, this line offers dependable, drop-in performance across a range of force ratings and lengths.

Specifications

Brand: Attwood
Material: #316 Stainless Steel Alloy with Marine-Grade Composite Components
Force Ratings: 40 lb and 60 lb
Rod Diameter: 8 mm
Socket Type: 10 mm Composite
Color/Finish: Silver
Package Quantity: 1

Sizes & Options

This line is available in two force and length combinations to match different hatch sizes and weights. The ST30-40-5 delivers 40 pounds of lifting force with a 10 inch extended / 7 inch compressed length, suited to smaller or lighter hatches and lids. The ST33-60-5 delivers 60 pounds of lifting force with a 15 inch extended / 9.5 inch compressed length, suited to larger or heavier hatches. Choose the option that most closely matches the weight of the hatch or lid and the mounting distance available, replacing an existing strut with a matching force rating whenever possible to preserve the original hold-open behavior.

Attwood Stainless Steel Gas Springs for Hatches & Deck Lids - Available in 40 lb and 60 lb

Specifications

Sizes & Options

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