Sea-Dog Gas Filled Lift Spring, 17 Inch Extended Length, 40 lb Force - Marine, RV and Truck Cap Gas Strut 321474-1

The Sea-Dog Gas Filled Lift Spring, part number 321474-1, is a 40 lb force gas strut built to marine OE standards for supporting hatches, hoods, covers, and lids that need controlled, one-handed lift assistance. With a 17 inch extended length, an 11 inch compressed length, and 6-3/4 inch of stroke travel, it is sized for mid-range hatch and lid applications across marine, RV, and truck cap uses. The strut uses a hard chromium plated shaft riding in bronze bushings, paired with a multi-lobe seal design engineered for long service life and smooth, consistent extension force over repeated cycles. A 15 mm rod diameter and 6 mm shaft diameter round out the strut's dimensions. Each unit ships complete and ready to install, with mounting ends sized to accept standard ball socket or eyelet hardware used on marine hatches, RV compartment doors, and truck cap lids. Sea-Dog backs this lift spring with a 2-year warranty, and the same 17 inch, 40 lb configuration is available across other force ratings and lengths in the Sea-Dog Gas Filled Lift Spring line for buyers who need a different lift force or overall length.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 321474-1
• Force Rating: 40 lb
• Extended Length: 17 inches
• Compressed Length: 11 inches
• Stroke Length: 6-3/4 inches
• Rod Diameter: 15 mm
• Shaft Diameter: 6 mm
• Material: Hard chromium plated shaft, bronze bushings
• Applications: Marine, RV, Truck Cap
• Weight: 0.384 pounds
• Package Quantity: 1 each
• UPC: 035514321891
• Warranty: 2-year

Frequently Asked Questions

What is the force rating and extended length of the Sea-Dog 321474-1 lift spring? The Sea-Dog 321474-1 Gas Filled Lift Spring is rated at 40 lb of force with a 17 inch extended length.

How long is this lift spring when fully compressed? Part number 321474-1 compresses to 11 inches, giving it 6-3/4 inches of stroke travel between fully extended and fully compressed.

What is the rod and shaft diameter on this Sea-Dog gas strut? The 321474-1 lift spring has a 15 mm rod diameter and a 6 mm shaft diameter.

What applications is the Sea-Dog 321474-1 gas spring designed for? This lift spring is designed for marine, RV, and truck cap applications, such as hatches, hoods, and compartment lids that need controlled one-handed lift support.

What materials are used in the Sea-Dog 321474-1 lift spring? It is built with a hard chromium plated shaft and bronze bushings, along with a multi-lobe seal designed for extended service life.

How much does the Sea-Dog 321474-1 gas lift spring weigh? The 321474-1 Gas Filled Lift Spring weighs 0.384 pounds.

Does the Sea-Dog 321474-1 lift spring come with a warranty? Yes, Sea-Dog covers the 321474-1 Gas Filled Lift Spring with a 2-year warranty.

How many lift springs are included when I order part 321474-1? Part number 321474-1 ships as a single unit, with a package quantity of 1 each.

Is the Sea-Dog 321474-1 an OEM or aftermarket part? The 321474-1 is a genuine Sea-Dog Gas Filled Lift Spring, manufactured to marine OE standards rather than being a generic aftermarket substitute.

What is different between the Sea-Dog 321474-1 and the 321473-1 or 321476-1 lift springs? All three share the same 17 inch extended, 11 inch compressed, and 6-3/4 inch stroke dimensions, but they differ in force rating: the 321473-1 is rated 30 lb, the 321474-1 is rated 40 lb, and the 321476-1 is rated 60 lb.

Will this lift spring fit a smaller or larger hatch than 17 inches? Part 321474-1 is sized for 17 inch extended length applications; Sea-Dog also offers 15 inch and 20 inch extended length versions in the same Gas Filled Lift Spring line for other hatch sizes.

How do I install the Sea-Dog 321474-1 gas lift spring? The 321474-1 lift spring installs by mounting its ball socket or eyelet ends to the existing hardware points on the hatch or lid, in the same orientation as the strut being replaced.