{"product_id":"sea-dog-321489-1-gas-filled-lift-spring-90-lb-force-20-in-extended-length-accepts-10-mm-ball-marine-rv-hatches-doors-tool-boxes","title":"Sea-Dog Gas Filled Lift Spring 321489-1 - 90 lb, 20 Inch Extended Length, Marine and RV","description":"\u003cp\u003eThe Sea-Dog Gas Filled Lift Spring 321489-1 is a 90 lb force gas spring built to marine OE standards for holding hatches, doors, and lids open safely and smoothly. It extends to 20 inches and compresses to 12 inches, giving an 8-1\/8 inch stroke that suits engine and access hatches, tool boxes, golf carts, canopies, seating, RV doors, furniture, truck caps, and utility boxes. The spring features a hard chromium plated shaft for corrosion resistance and long service life, bronze bushings for smooth, low-friction operation, and polymer end fittings that accept a 10 mm ball stud. Its unique multi-lobe seal design offers superior sealing performance compared to standard single-lobe gas springs, reducing leak-down and extending usable life in marine and outdoor environments. This lift spring is rated for both marine (application code 1) and RV (application code 2) use, and Sea-Dog backs it with a 2-year warranty. Whether you are replacing a worn or leaking lift support or fitting out a new hatch or door, the 321489-1 delivers consistent 90 lb of lifting force with the fit and finish expected from marine-grade hardware.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sea-Dog\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 321489-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForce Rating:\u003c\/strong\u003e 90 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended Length:\u003c\/strong\u003e 20 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompressed Length:\u003c\/strong\u003e 12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke Length:\u003c\/strong\u003e 8-1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBall Socket Diameter:\u003c\/strong\u003e 18 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRod Diameter:\u003c\/strong\u003e 8 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBall Stud Size Accepted:\u003c\/strong\u003e 10 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Marine, RV\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Material:\u003c\/strong\u003e Hard chromium plated steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBushing Material:\u003c\/strong\u003e Bronze\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Fitting Material:\u003c\/strong\u003e Polymer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.698 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e 1 each\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 035514321976\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 2-year Sea-Dog warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eRated for marine and RV applications, including engine or access hatches, doors, tool boxes, golf carts, canopies, seating, RV doors, furniture, truck caps, and utility boxes. Accepts a 10 mm ball stud.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow much force does the Sea-Dog 321489-1 lift spring provide?\u003c\/strong\u003e The Sea-Dog 321489-1 provides 90 pounds of lifting force, making it suited to heavier hatches, doors, and lids that need a stronger gas spring than the lighter-rated versions in the same lineup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the extended and compressed length of this gas spring?\u003c\/strong\u003e The 321489-1 extends to 20 inches and compresses to 12 inches, giving it an 8-1\/8 inch stroke.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sea-Dog 321489-1 suitable for RV use, or only marine use?\u003c\/strong\u003e Yes, the 321489-1 is rated for both marine and RV applications, along with tool box, canopy, seating, furniture, truck cap, and utility box uses.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat ball stud size does this lift spring require?\u003c\/strong\u003e The Sea-Dog 321489-1 accepts a 10 mm ball stud at its polymer end fittings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat materials is the 321489-1 gas spring made from?\u003c\/strong\u003e It has a hard chromium plated shaft for corrosion resistance, bronze bushings for smooth operation, and polymer end fittings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sea-Dog 321489-1 weigh?\u003c\/strong\u003e The 321489-1 weighs 0.698 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sea-Dog 321489-1 come with a warranty?\u003c\/strong\u003e Yes, Sea-Dog covers the 321489-1 gas filled lift spring with a 2-year warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the rod diameter and ball socket diameter on this part?\u003c\/strong\u003e The 321489-1 has an 18 mm ball socket diameter and an 8 mm rod diameter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is different between the 321489-1 and other Sea-Dog lift springs like the 321488-1?\u003c\/strong\u003e The 321489-1 is the 90 lb force version with an 18 mm ball socket and 8 mm rod, sharing the same 20 inch extended length and 12 inch compressed length as the 80 lb 321488-1, but delivering more lifting force.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is in the box with the Sea-Dog 321489-1?\u003c\/strong\u003e Each 321489-1 gas filled lift spring ships as a single unit, one per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this gas spring be used on truck caps and tool boxes, not just boats?\u003c\/strong\u003e Yes, in addition to marine and RV applications, the Sea-Dog 321489-1 is designed to work on tool boxes, truck caps, canopies, and utility boxes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does this lift spring use a multi-lobe seal instead of a standard seal?\u003c\/strong\u003e The multi-lobe seal on the Sea-Dog 321489-1 is designed to offer longer service life and more consistent performance than a standard single-lobe seal design.\u003c\/p\u003e","brand":"Sea-Dog","offers":[{"title":"Default Title","offer_id":48988655780059,"sku":"S-D-321489-1","price":34.08,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/7982_a3b5961f-f925-4400-b211-5e345ebc7faa.jpg?v=1784425296","url":"https:\/\/www.goodvibesmarina.com\/products\/sea-dog-321489-1-gas-filled-lift-spring-90-lb-force-20-in-extended-length-accepts-10-mm-ball-marine-rv-hatches-doors-tool-boxes","provider":"Good Vibes Marina","version":"1.0","type":"link"}