{"product_id":"attwood-sl35-50-5-gas-spring-lift-support-50-lb","title":"Attwood SL35-50-5 Gas Spring Lift Support 50 lb","description":"\u003cp class=\"nvn-hero\"\u003eThe Attwood SL35-50-5 is a 50-pound gas spring built to hold up hatches, seat bases, and storage lids on your boat. It runs from 8.46 inches compressed to 12.04 inches extended, with eyelet ends on both mounts. When your old strut won't hold a lid open anymore, this is the kind of part that fixes it in a few minutes.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Attwood SL35-50-5 is a gas spring, sometimes called a lift support or gas strut, rated at 50 pounds of output force. Its whole job is simple. Hold something up so you don't have to. On a boat that usually means a hatch, a livewell lid, a seat base, or an engine box cover that's supposed to stay open on its own while your hands are busy. When the spring in one of those gives out, the lid drops on your fingers or won't stay put in a chop. This is the part that fixes that.\u003c\/p\u003e\n\u003cp\u003eHere are the numbers that matter. Compressed, it measures 8.46 inches end to end. Fully extended, it reaches 12.04 inches. That works out to 3.58 inches of travel, which is the stroke you get between closed and open. The output force is 50 pounds, meaning the spring pushes with 50 pounds of effort as it extends. The rod is 8 millimeters and the cylinder is 18 millimeters, so it's a compact strut that fits tight compartments. Both ends use eyelet mounts sized for a 10 millimeter ball socket, the common end fitting you'll find on most marine gas springs.\u003c\/p\u003e\n\u003cp\u003eWhere does a spring like this live on a boat? All over, honestly. Under-seat storage on a center console. The lid over a livewell or a bait station. Anchor lockers up on the bow. Engine hatches on smaller outboards and I\/O boxes. Rod locker lids. Step-up storage on a pontoon. Anywhere a builder wanted a lid to open easily and stay open, there's a gas spring doing the work. Attwood has been building marine hardware for over a hundred years, and gas springs like the SL35 series are a staple of that catalog.\u003c\/p\u003e\n\u003cp\u003eMatching force is the part people get wrong. A 50 pound spring is meant to balance a lid of a certain weight and hinge geometry. Too little force and the lid won't stay up. Too much and it flies open or strains the hinge. The safest way to get it right is to match what came off. Measure the compressed and extended lengths of your old strut, check the force rating stamped on the cylinder if it's still legible, and match all three. This SL35-50-5 gives you 8.46 inches compressed, 12.04 extended, and 50 pounds. If your original matches those numbers, you're set.\u003c\/p\u003e\n\u003cp\u003eA quick word on mounting. Gas springs work best mounted rod-down, meaning the thin rod points toward the ground when the lid is closed. That keeps the internal seal bathed in oil and makes the action smooth and consistent. If your compartment forces a different angle, the spring will still work, it just tends to last longer rod-down. The eyelet ends slip over 10 millimeter ball studs and clip on, so swapping one is genuinely a few-minute job with no special tools.\u003c\/p\u003e\n\u003cp\u003eMost boaters replace these in pairs. If a lid uses two springs and one has failed, the other is usually not far behind, and a mismatched pair makes a lid open crooked. It's sold here as a single gas spring, so order the count your setup needs. If you're not sure how many your lid uses, pop it open and look at the hinge points before you buy.\u003c\/p\u003e\n\u003cp\u003eHow do you know one is worn out? A tired gas spring gets slow, won't hold the lid at full height, or drifts closed on its own. Some start weeping oil around the rod. Cold weather makes a marginal spring worse, so a strut that barely held in summer will give up first on a cold morning. None of that is a repair. Gas springs are sealed and aren't serviceable, so when one quits you swap it. At this price, that's an easy call.\u003c\/p\u003e\n\u003cp\u003eSo who's this for? Any boater staring at a hatch that won't stay open, or a rigger who needs a known 50 pound strut with eyelet ends for a repower or a refit. It's a straightforward, no-drama replacement part. Match the length and the force, clip it on, and get back to the water.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e50 lb output force, sized to hold hatches, seat bases, and storage lids open and steady\u003c\/li\u003e\n  \u003cli\u003e8.46 in compressed and 12.04 in extended length, with 3.58 in of travel from closed to open\u003c\/li\u003e\n  \u003cli\u003e8 mm rod and 18 mm cylinder for a compact strut that fits tight compartments\u003c\/li\u003e\n  \u003cli\u003eEyelet mounts on both ends, sized for standard 10 mm ball sockets for a tool-free clip-on swap\u003c\/li\u003e\n  \u003cli\u003eGas-charged sealed design that damps smoothly and stays put once the lid is up\u003c\/li\u003e\n  \u003cli\u003eBuilt by Attwood, a marine hardware maker with over a century in the business\u003c\/li\u003e\n  \u003cli\u003eDirect-fit replacement when you match the 8.46 in \/ 12.04 in length and 50 lb force to your original\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Attwood Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow much force does the Attwood SL35-50-5 put out?\u003c\/summary\u003e\n    \u003cp\u003e50 pounds. That's the push it delivers as it extends, sized to balance a lid or hatch of matching weight.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the compressed and extended lengths?\u003c\/summary\u003e\n    \u003cp\u003e8.46 inches compressed and 12.04 inches fully extended, which gives 3.58 inches of travel between closed and open.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat end fittings does it use?\u003c\/summary\u003e\n    \u003cp\u003eEyelet mounts on both ends, sized for a standard 10 millimeter ball socket. They clip onto 10 mm ball studs with no tools.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size are the rod and cylinder?\u003c\/summary\u003e\n    \u003cp\u003eThe rod is 8 millimeters and the cylinder is 18 millimeters, so it's a slim strut that fits into tight compartments.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's a gas spring like this used for on a boat?\u003c\/summary\u003e\n    \u003cp\u003eHolding up hatches, livewell and bait lids, under-seat storage, anchor lockers, engine boxes, and rod locker lids. Anywhere a lid needs to open easily and stay open.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I pick the right force for my hatch?\u003c\/summary\u003e\n    \u003cp\u003eMatch your original. Measure the compressed and extended lengths of the old strut and check its force rating, then match all three. This one is 8.46 in compressed, 12.04 extended, and 50 lb.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich way should I mount it?\u003c\/summary\u003e\n    \u003cp\u003eGas springs run best rod-down, with the thin rod pointing toward the ground when the lid is closed. That keeps the seal oiled and the action smooth. It'll work at other angles, it just lasts longer rod-down.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this come as a pair?\u003c\/summary\u003e\n    \u003cp\u003eIt's sold as a single gas spring. If your lid uses two, order two. Most boaters replace both at once so the lid opens evenly.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I rebuild one that's gone soft?\u003c\/summary\u003e\n    \u003cp\u003eNo. Gas springs are sealed and not serviceable. When one gets slow, drifts closed, or weeps oil, you replace it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy did my old one fail faster in cold weather?\u003c\/summary\u003e\n    \u003cp\u003eCold thins out the push a marginal gas spring can make, so one that barely held in summer often gives up first on a cold morning. A fresh spring restores full force.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eAttwood SL35-50-5 Gas Spring Lift Support\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eAttwood Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eSL35-50-5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e715584035507\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpring Type\u003c\/th\u003e\n\u003ctd\u003eGas\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutput Force\u003c\/th\u003e\n\u003ctd\u003e50 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompressed Length\u003c\/th\u003e\n\u003ctd\u003e8.46 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eExtended Length\u003c\/th\u003e\n\u003ctd\u003e12.04 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTravel Length\u003c\/th\u003e\n\u003ctd\u003e3.58 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRod Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCylinder Diameter\u003c\/th\u003e\n\u003ctd\u003e18 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUpper Mount\u003c\/th\u003e\n\u003ctd\u003eEyelet\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLower Mount\u003c\/th\u003e\n\u003ctd\u003eEyelet\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eEnd Fitting Socket\u003c\/th\u003e\n\u003ctd\u003e10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How much force does the Attwood SL35-50-5 put out?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"50 pounds. That's the push it delivers as it extends, sized to balance a lid or hatch of matching weight.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What are the compressed and extended lengths?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"8.46 inches compressed and 12.04 inches fully extended, which gives 3.58 inches of travel between closed and open.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What end fittings does it use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Eyelet mounts on both ends, sized for a standard 10 millimeter ball socket. They clip onto 10 mm ball studs with no tools.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size are the rod and cylinder?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The rod is 8 millimeters and the cylinder is 18 millimeters, so it's a slim strut that fits into tight compartments.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's a gas spring like this used for on a boat?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Holding up hatches, livewell and bait lids, under-seat storage, anchor lockers, engine boxes, and rod locker lids. Anywhere a lid needs to open easily and stay open.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I pick the right force for my hatch?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Match your original. Measure the compressed and extended lengths of the old strut and check its force rating, then match all three. This one is 8.46 in compressed, 12.04 extended, and 50 lb.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Which way should I mount it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Gas springs run best rod-down, with the thin rod pointing toward the ground when the lid is closed. That keeps the seal oiled and the action smooth. It'll work at other angles, it just lasts longer rod-down.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does this come as a pair?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's sold as a single gas spring. If your lid uses two, order two. Most boaters replace both at once so the lid opens evenly.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I rebuild one that's gone soft?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. Gas springs are sealed and not serviceable. When one gets slow, drifts closed, or weeps oil, you replace it.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why did my old one fail faster in cold weather?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Cold thins out the push a marginal gas spring can make, so one that barely held in summer often gives up first on a cold morning. A fresh spring restores full force.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Attwood Marine","offers":[{"title":"Default Title","offer_id":45081174081629,"sku":"2010133","price":19.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_9d6588b8-628f-4d67-946a-abba860637ec.jpg?v=1790003674","url":"https:\/\/nvnmarine.com\/products\/attwood-sl35-50-5-gas-spring-lift-support-50-lb","provider":"NVN Marine","version":"1.0","type":"link"}