{"id":3697,"date":"2026-10-29T14:47:17","date_gmt":"2026-10-29T06:47:17","guid":{"rendered":"http:\/\/www.sowocn.com\/blog\/?p=3697"},"modified":"2026-10-29T14:47:17","modified_gmt":"2026-10-29T06:47:17","slug":"can-washers-be-used-in-outdoor-applications-4c8e-5b0063","status":"publish","type":"post","link":"http:\/\/www.sowocn.com\/blog\/2026\/10\/29\/can-washers-be-used-in-outdoor-applications-4c8e-5b0063\/","title":{"rendered":"Can washers be used in outdoor applications?"},"content":{"rendered":"

If you\u2019ve ever browsed a hardware store\u2019s fastener aisle on a rainy Saturday, chances are you\u2019ve walked past a stack of washers and not given them a second thought. I\u2019m a supplier of washers\u2014steel, stainless, nylon, the works\u2014and for years, I\u2019ve heard the same question come up from contractors, DIYers, and even small industrial teams: \u201cCan these washers even hold up outside?\u201d It\u2019s a fair question. Outdoor applications expose every part of a build to something most indoor projects never see: salt spray, UV rays, fluctuating temperatures, rain, and dirt that gets ground into every seam. So let\u2019s break this down, no stuffy engineering jargon, just the real-world stuff I see come through my warehouse every day. Washers<\/a><\/p>\n

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First, let\u2019s start with what a washer actually does, because understanding its job makes it easier to see why outdoor use can go wrong. A washer\u2019s two core purposes are: to distribute the load of a bolt or nut so it doesn\u2019t pull through wood, plastic, or thin metal, and to act as a barrier between two materials to prevent galvanic corrosion. Galvanic corrosion, for anyone who\u2019s not deep into fastener specs, is when two different metals touch in the presence of moisture\u2014they start to eat each other alive, like two bullies picking on the weakest one. A washer acts as the middleman here, stopping that contact. But for that middleman to work outside, it has to hold up to the same harsh conditions as the rest of the project.<\/p>\n

That\u2019s where the biggest mistake people make: grabbing the cheapest steel washer from the hardware bin and slapping it on a deck or a fence post. Plain carbon steel washers are fine for a indoor shelf bracket or a lawnmower\u2019s carburetor, but leave one on a coastal deck or a fence post that gets rained on weekly, and you\u2019ll be replacing it before the first winter. Carbon steel rusts. Rust expands, prying apart the wood it\u2019s meant to fasten, and the rust itself eats through the fastener it\u2019s paired with, too. I once had a contractor come into my shop, panicking, because he\u2019d installed a $10,000 outdoor deck using standard steel washers. Six months later, the washers had rusted so bad the deck boards were starting to separate. He ended up replacing every single washer\u2014costing him more in labor than the initial savings on cheap parts.<\/p>\n

So what washers actually work for outdoor applications? Let\u2019s go through the common types I supply, and where each belongs, because not all outdoor jobs are the same.<\/p>\n

Stainless steel washers are the workhorse here. Specifically, 304 and 316 grades. 304 is the most common, good for general outdoor use\u2014deck rails, fence posts, backyard shed doors\u2014where moisture is occasional, not constant. It resists rust and galvanic corrosion as long as it\u2019s not touching something like aluminum, but if you\u2019re on the coast? 304 might not cut it. Saltwater is a harsh enemy. I saw a customer last year use 304 stainless washers on a dock piling in Florida. By the end of the first year, the salt spray had pitted the washers so badly they lost their load-bearing capacity. That\u2019s when 316 stainless comes in. It\u2019s alloyed with molybdenum, which makes it resistant to chloride corrosion\u2014perfect for coastal docks, boat lifts, or any application within a mile of the ocean. It\u2019s a bit more expensive, but I always tell customers: a $0.10 washer that lasts 10 years is way better than a $0.02 washer that needs replacing every two.<\/p>\n

Then there\u2019s nylon washers. These are non-metallic, so they eliminate galvanic corrosion entirely, which makes them great for pairing with aluminum, a metal that reacts badly with steel. I use nylon washers a lot for outdoor window frames, RV slides, or any project where two different metals are in constant contact. Nylon doesn\u2019t rust, it\u2019s resistant to mild UV exposure (though you don\u2019t want to leave it in direct sun 24\/7 for years), and it won\u2019t scratch soft materials like aluminum siding. The catch? Nylon breaks down in extreme heat. If you\u2019re building a deck around a wood-burning fire pit, don\u2019t use nylon washers\u2014they\u2019ll melt. Stick to stainless there.<\/p>\n

Another type people overlook is zinc-plated washers. Wait, don\u2019t write that off\u2014if you use the right zinc coating, they can work for mild outdoor use. The key here is \u201chot-dip galvanized\u201d vs. the cheap electroplated stuff. Electroplated zinc is a thin coating that scratches off the first time you tighten a bolt, leaving the steel underneath exposed to rust. Hot-dip galvanized washers are dipped in molten zinc, creating a thick, durable coating that lasts much longer in rain and mild humidity. I sell a lot of hot-dip galvanized washers for chain-link fence installations, where the budget is tight but the job needs to hold up. Just make sure you pair them with a fastener that\u2019s also galvanized\u2014same as with stainless, mixing galvanized and uncoated steel will cause corrosion.<\/p>\n

Now, let\u2019s talk about the applications where washers absolutely can be used outdoors, but with some caveats. Let\u2019s start with residential projects: backyard decks, garden fences, outdoor tool sheds, patio furniture. For these, 304 stainless or hot-dip galvanized washers are standard. I recommend checking the fastener\u2019s rating, too\u2014if the bolt you\u2019re using is rated for outdoor use, make sure the washer matches that rating. For example, a deck bolt that\u2019s \u201cpressure-treated wood rated\u201d will pair with a washer that can handle the preservative chemicals in the wood, which can be corrosive too. Pressure-treated lumber has come a long way, but old habits die hard\u2014still, don\u2019t use cheap steel washers there.<\/p>\n

Then there\u2019s commercial and industrial outdoor applications: warehouse loading dock doors, agricultural equipment, playground equipment, road guardrails. These are the jobs where I see people pushing washers to their limits. Playground equipment is a big one\u2014kids are hard on hardware, and rain + dirt + constant use means washers need to hold up. I supply 316 stainless for commercial playgrounds, because not only does it resist rust, but it\u2019s smooth, so it won\u2019t catch on clothes or skin. Agricultural equipment, on the other hand, is exposed to fertilizer chemicals, mud, and constant temperature swings. Hot-dip galvanized washers are popular here, but a lot of farmers also use 316 for parts that are near water or salt, like irrigation lines.<\/p>\n

But here\u2019s where it gets tricky: some outdoor projects should not use certain washers. Let\u2019s list the no-gos. First, plain carbon steel washers, as I mentioned earlier\u2014they will rust, plain and simple, no matter how much you paint over them. The paint will chip, the rust will come through, and you\u2019ll end up with a failed fastener. Second, uncoated aluminum washers. Aluminum is soft, so it compresses over time, losing its load-bearing ability. It also corrodes in contact with moisture, and when it corrodes, it creates a white powder that eats away at the fastener. Third, low-quality nylon washers. Some discount nylon washers break down after a few years of UV exposure, getting brittle and cracking. Always look for washers that are rated for outdoor UV resistance\u2014you\u2019ll see that on the packaging, usually as \u201cUV-stabilized nylon.\u201d<\/p>\n

I get a lot of questions about whether you can reuse washers outdoors. The short answer is: don\u2019t. Once a washer has been installed outside, it\u2019s already been exposed to moisture, UV, and dirt. Even if it looks fine, the load-bearing capacity is compromised. I\u2019ve had customers try to reuse old washers from a fence they took down, only to have the new fence fail a year later because the old washers had already corroded. It\u2019s just not worth the risk.<\/p>\n

Another common myth: \u201cAny stainless washer works for outdoor use.\u201d No, grades matter. 304 vs. 316 is a difference of life expectancy by years, especially in harsh environments. I had a builder come in last month who had used 304 washers on a project in South Carolina, near the coast. He\u2019d noticed pitting, so he swapped to 316, and the same project three years later had zero issues. It\u2019s not that 304 is bad\u2014it\u2019s just not built for salt spray, humidity, and constant coastal conditions.<\/p>\n

Now, let\u2019s talk about real-world examples, because that\u2019s what matters. Last year, I worked with a marina owner in Georgia who needed to repair his boat slips. He\u2019d been using cheap washers before, and every two years, he had to replace the bolts and washers. I supplied him with 316 stainless fender washers (larger diameter, to distribute load better) paired with 316 stainless bolts. A year later, he called me to say it was the only repair job he\u2019d done that didn\u2019t need touching up. He ended up ordering another 5,000 washers for his other slips.<\/p>\n

On the flip side, I had a homeowner last summer who tried to save $20 on washers for his backyard fence. He used standard steel washers, and by the end of the first winter, the washers had rusted so badly the fence posts were leaning. He had to tear the whole fence down and redo it with stainless washers, costing him three times the initial savings. That\u2019s the kind of mistake I see all the time, and it\u2019s why I always stress to customers: the washer isn\u2019t an afterthought, it\u2019s a critical part of the outdoor build.<\/p>\n

So, can washers be used in outdoor applications? Absolutely\u2014if you pick the right type, match it to the environment, and don\u2019t cut corners. The key is to treat your washers like the important fastener component they are, not an afterthought grab from the hardware bin. Whether you\u2019re building a small backyard deck or a large industrial dock, the right washer will make your project last longer, save you money in repairs, and keep everything safe.<\/p>\n

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If you\u2019re working on an outdoor project and aren\u2019t sure which washer is right for your needs, don\u2019t guess. Reach out to discuss your specific application, environment, and load requirements. We\u2019re here to help you pick the perfect washer for the job, no jargon, no hassle.<\/p>\n

Hex Nut<\/a> References
\nASM International. (2006). Corrosion: Understanding the Basics. ASM International.
\nASTM International. (2018). Standard Specification for Washers, Steel, Mechanical. ASTM F436-18.
\nNational Association of Home Builders. (2020). Outdoor Fastener and Material Guide. NAHB Research Center.<\/p>\n

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Jiaxing Jinling Hardware Technolgy Joint Stock Co., Ltd.<\/a>
As one of the most experienced washers manufacturers and suppliers in China, we also support customized service. Please feel free to buy bulk high-grade washers made in China here from our factory. For quotation and price list, contact us now.
Address: No.32, Shenjiadai, Xuyouche Village, Qinshan Subdistrict, Haiyan County, Zhejiang Province, China
E-mail: jlzxl@jinlingfstn.com
WebSite: https:\/\/www.china-nut-factory.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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