{"product_id":"attwood-sl36-40-5-gas-spring-lift-support-40-lb","title":"Attwood SL36-40-5 Gas Spring Lift Support, 40 lb","description":"\u003cp class=\"nvn-hero\"\u003eThe Attwood SL36-40-5 is a marine gas spring that holds your hatch, locker, or lid open with a steady 40 pounds of lift. It extends to 17.2 inches, compresses to 10.2, and gives you 7 inches of travel through eyelet-to-eyelet mounts. When your old strut won't hold a lid up anymore, this is the honest replacement.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Attwood SL36-40-5 is a marine gas spring, the kind of quiet little part you never think about until the day your hatch lid drops on your hand. It puts out 40 pounds of lift, extends to 17.2 inches, and compresses down to 10.2. That gives you 7 inches of travel, which covers a lot of the mid-size hatches, lockers, and seat lids you'll find on a fishing boat or a runabout.\u003c\/p\u003e\n\u003cp\u003eHere's what a gas spring actually does. Inside that 18 millimeter cylinder is a charge of pressurized gas working against an 8 millimeter rod. Push the lid closed and the gas compresses. Let go and it pushes back, slow and steady, holding the lid up right where you left it. No prop rod to fumble with. No lid slamming down while your hands are full of tackle or dock lines. When the charge is right, it feels effortless, and that's the whole point.\u003c\/p\u003e\n\u003cp\u003eThis one is sized for real boat jobs. Think livewell and baitwell lids, under-seat storage, anchor lockers, small engine hatches, and console access doors. The 40 pound rating is a mid-range force, so it's a good match for a lid that's got some weight to it but isn't a huge deck hatch. If your old strut was a 40 pound unit and it's gone soft, this is the honest swap.\u003c\/p\u003e\n\u003cp\u003eBoth ends use eyelet mounts made for standard 10 millimeter end fittings, so it bolts up to the ball studs or eyelet brackets already on your boat. That keeps the install simple. In most cases you're pulling one worn spring and dropping this one straight in, no drilling, no new brackets.\u003c\/p\u003e\n\u003cp\u003eA few install notes from experience. Gas springs like to be mounted rod-down when the lid is closed. That keeps the seals lubricated and helps the spring last. Watch your geometry too, the spring wants a clean arc through its 7 inches of travel without binding against the frame. And if your lid is wide or heavy, two springs sharing the load will always feel better and last longer than one working alone.\u003c\/p\u003e\n\u003cp\u003eNot sure if the 40 pound version is your spring? The quickest check is the number stamped on the old one. Attwood prints the model right on the cylinder, and SL36-40-5 tells you it's the 40 pound, 17.2 inch unit. If yours reads a different force or length, we carry the neighbors in the SL36 line, so you can match travel and lift instead of guessing. Getting the force right matters more than people think. Too little and the lid won't stay up, too much and it fights you every time you close it.\u003c\/p\u003e\n\u003cp\u003eGas springs are wear items. They lose a little charge over years of salt, sun, and slamming, and eventually a lid that used to stand up on its own starts sagging. That's normal. Carrying the SL36-40-5 as a replacement means you can bring a tired hatch back to life in a few minutes with a wrench, instead of living with a bungee cord or a stick holding your locker open.\u003c\/p\u003e\n\u003cp\u003eWhy buy a marine gas spring instead of a generic one from the hardware aisle? Salt air and constant spray are hard on cheap hardware. A strut that rusts at the rod seal starts weeping oil and loses its hold fast. Attwood builds these for the water, which is why you'll find them holding hatches on center consoles, pontoons, and bass boats season after season.\u003c\/p\u003e\n\u003cp\u003eAttwood has been building marine hardware for over 100 years, and their lift supports are a staple on boats from a lot of different builders. This unit ships in aftermarket packaging, so you're getting the same spring without the branded retail box. The part number is SL36-40-5. If that matches what's stamped on your old strut, you're in the right place.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e40 pound output force holds mid-size hatches, lockers, and lids open without slowly creeping shut\u003c\/li\u003e\n  \u003cli\u003e17.2 inch extended and 10.2 inch compressed lengths deliver 7 inches of travel for common hatch spans\u003c\/li\u003e\n  \u003cli\u003eEyelet upper mount and eyelet lower mount fit standard 10 millimeter end fittings\u003c\/li\u003e\n  \u003cli\u003e8 millimeter rod paired with an 18 millimeter cylinder for repeated open-and-close cycles\u003c\/li\u003e\n  \u003cli\u003eSealed gas charge gives smooth, controlled lift instead of a lid that snaps or slams\u003c\/li\u003e\n  \u003cli\u003eMarine-focused Ni-Slide design built for boat hatches, lockers, and compartment lids\u003c\/li\u003e\n  \u003cli\u003eDirect SL36-40-5 replacement in aftermarket packaging\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 weight will this gas spring hold?\u003c\/summary\u003e\n    \u003cp\u003eThe SL36-40-5 puts out 40 pounds of output force. That's a mid-range rating suited to livewell lids, under-seat storage, anchor lockers, and small engine hatches. For a wide or heavy lid, running two springs to share the load is the better move.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the extended and compressed lengths?\u003c\/summary\u003e\n    \u003cp\u003eIt extends to 17.2 inches and compresses down to 10.2 inches, which gives you 7 inches of travel between fully open and fully closed.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat kind of mounting ends does it have?\u003c\/summary\u003e\n    \u003cp\u003eBoth ends are eyelet mounts sized for standard 10 millimeter end fittings. That lets it bolt onto the eyelet brackets or ball studs already on your boat in most cases.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow big are the rod and cylinder?\u003c\/summary\u003e\n    \u003cp\u003eThe rod is 8 millimeters and the cylinder is 18 millimeters. That's a common size for mid-force marine gas springs.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich way should I mount a gas spring?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule, mount it so the rod points down when the lid is closed. That keeps the internal seals lubricated and helps the spring hold its charge longer. Give it a clean travel arc so it doesn't bind against the frame.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need one spring or two for my hatch?\u003c\/summary\u003e\n    \u003cp\u003eOne 40 pound spring handles many mid-size lids on its own. If your lid is wide, heavy, or catches the wind, two springs sharing the load will feel more balanced and last longer than a single spring doing all the work.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a direct replacement for my old Attwood strut?\u003c\/summary\u003e\n    \u003cp\u003eIf the number stamped on your old cylinder reads SL36-40-5, this is the same 40 pound, 17.2 inch unit and drops right in. If it reads a different force or length, match to that number instead.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs it built for saltwater use?\u003c\/summary\u003e\n    \u003cp\u003eYes. It's an Attwood marine gas spring made for the salt, spray, and sun of an open boat, which is where a generic hardware-store strut tends to rust and fail early.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhere is it made?\u003c\/summary\u003e\n    \u003cp\u003eThis gas spring is made in the USA.\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 SL36-40-5 Gas Spring Hatch 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\u003eSL36-40-5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e715584036405\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eGas\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eNi-Slide\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\u003eCompressed Length\u003c\/th\u003e\n\u003ctd\u003e10.2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eExtended Length\u003c\/th\u003e\n\u003ctd\u003e17.2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTravel Length\u003c\/th\u003e\n\u003ctd\u003e7 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutput Force\u003c\/th\u003e\n\u003ctd\u003e40 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSocket Size\u003c\/th\u003e\n\u003ctd\u003e10 mm\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\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePackaging\u003c\/th\u003e\n\u003ctd\u003eAftermarket\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 weight will this gas spring hold?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The SL36-40-5 puts out 40 pounds of output force. That's a mid-range rating suited to livewell lids, under-seat storage, anchor lockers, and small engine hatches. For a wide or heavy lid, running two springs to share the load is the better move.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What are the extended and compressed lengths?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It extends to 17.2 inches and compresses down to 10.2 inches, which gives you 7 inches of travel between fully open and fully closed.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What kind of mounting ends does it have?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Both ends are eyelet mounts sized for standard 10 millimeter end fittings. That lets it bolt onto the eyelet brackets or ball studs already on your boat in most cases.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How big are the rod and cylinder?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The rod is 8 millimeters and the cylinder is 18 millimeters. That's a common size for mid-force marine gas springs.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Which way should I mount a gas spring?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"As a rule, mount it so the rod points down when the lid is closed. That keeps the internal seals lubricated and helps the spring hold its charge longer. Give it a clean travel arc so it doesn't bind against the frame.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need one spring or two for my hatch?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"One 40 pound spring handles many mid-size lids on its own. If your lid is wide, heavy, or catches the wind, two springs sharing the load will feel more balanced and last longer than a single spring doing all the work.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a direct replacement for my old Attwood strut?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"If the number stamped on your old cylinder reads SL36-40-5, this is the same 40 pound, 17.2 inch unit and drops right in. If it reads a different force or length, match to that number instead.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is it built for saltwater use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It's an Attwood marine gas spring made for the salt, spray, and sun of an open boat, which is where a generic hardware-store strut tends to rust and fail early.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Where is it made?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"This gas spring is made in the USA.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Attwood Marine","offers":[{"title":"Default Title","offer_id":45081164120157,"sku":"2010132","price":19.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_3f6c569b-673d-40d4-8b51-4b15f64da46b.jpg?v=1790003658","url":"https:\/\/nvnmarine.com\/products\/attwood-sl36-40-5-gas-spring-lift-support-40-lb","provider":"NVN Marine","version":"1.0","type":"link"}