{"id":536,"date":"2026-10-15T14:06:57","date_gmt":"2026-10-15T06:06:57","guid":{"rendered":"http:\/\/www.scmtscnc.com\/blog\/?p=536"},"modified":"2026-10-15T14:06:57","modified_gmt":"2026-10-15T06:06:57","slug":"how-do-constant-force-springs-compare-to-gas-springs-41eb-1dc55f","status":"publish","type":"post","link":"http:\/\/www.scmtscnc.com\/blog\/2026\/10\/15\/how-do-constant-force-springs-compare-to-gas-springs-41eb-1dc55f\/","title":{"rendered":"How do constant force springs compare to gas springs?"},"content":{"rendered":"

Hey folks, if you\u2019ve ever been deep in a machinery, automotive, or industrial design project, you\u2019ve probably stared at two common tension\/force solutions and wondered: constant force springs vs. gas springs \u2014 which one\u2019s actually worth picking for your build? As someone who\u2019s been supplying constant force springs for over a decade, I\u2019ve talked to more design engineers, maintenance techs, and small business owners than I can count, and the most common question I get is this: \u201cwhen do I pick one over the other, and is the old go-to gas spring really the only solid option?\u201d Constant Force Spring<\/a><\/p>\n

<\/p>\n

First, let\u2019s cut the jargon. I\u2019m not here to dump specs that\u2019ll make your eyes cross at 2 a.m. when you\u2019re troubleshooting a prototype. Let\u2019s start with what each of these actually does, no fancy textbook fluff.<\/p>\n

What Even Are<\/em> These Two, Anyway?<\/h3>\n

Constant force springs are those flat, tempered steel (or sometimes stainless steel) strips wound super tight into a neat little coil. When you pull the end out, they unfurl and exert almost the exact same amount of force the entire length of the extension \u2014 no gradual lightening or getting heavier as they stretch. It\u2019s like a really reliable, low-key elastic band that never loses its tension. We\u2019ve been messing with these for everything from window counterbalances to medical device latches, honestly, they\u2019re way more versatile than most people think.<\/p>\n

Gas springs? Those are the cylindrical, sealed tubes full of compressed nitrogen gas and a little oil, right? They work by pushing out a rod when you apply pressure (or hold back when you need controlled lowering). You see them on car hoods, truck tailgates, office chair seats \u2014 they\u2019re designed for one-directional movement and controlled force, usually with a bit of give, not a constant, steady pull\/push all the way through.<\/p>\n

The Real World Breakdown: Where They Shine (And Where They Suck)<\/h3>\n

Let\u2019s get into the good stuff, because theory only goes so far.<\/p>\n

Force Consistency (The Big One)<\/h4>\n

This is where constant force springs absolutely crush gas springs. Think about it: if you need a door to stay open at exactly the same pressure no matter how far it swings, or a medical tray to pull out evenly without jostling a delicate sample, constant force springs deliver. Their force is accurate within 1-2% across the entire extension length \u2014 that\u2019s super tight. Gas springs, though? Their force drops as they extend. A 50lb gas spring might start at 50lb when compressed, but by the time it\u2019s fully extended, it\u2019s only putting out 35-40lb. That\u2019s a huge difference for applications that need steady tension. I once had a aerospace engineer come to me because his old gas springs were causing a panel to slam shut at the end of its travel \u2014 switching to constant force springs fixed it in an hour.<\/p>\n

Space & Weight (Game Changers for Tight Spots)<\/h4>\n

If you\u2019re working with a tiny device \u2014 like a smart pen, a camera lens mechanism, or a small medical injector \u2014 constant force springs are tiny. A 10lb constant force spring might be as small as a quarter in diameter, and it\u2019s just a thin strip of metal, so it fits into narrow gaps. Gas springs? They\u2019re big, bulky cylinders. A 10lb gas spring is at least an inch thick and several inches long, not ideal for compact builds. Weight? Constant force springs are almost always lighter, too \u2014 if you\u2019re building a drone or a portable medical device, cutting even an ounce matters. No question, constant force springs win here.<\/p>\n

Temperature & Durability (No Surprises Here)<\/h4>\n

Wait, let\u2019s talk about extremes. Constant force springs are built to handle heat up to 500\u00b0F (with high-temp steel) and down to -40\u00b0F, no problem. They don\u2019t have any fluids or gas that can leak or expand\/contract, so their force stays steady in cold or hot environments. Gas springs? They hate temperature swings. Leave a car with a gas spring hood out in -10\u00b0F weather, and that gas will contract \u2014 the hood won\u2019t stay open, it\u2019ll slam down. Crank up a piece of industrial equipment to 120\u00b0F, and the gas expands, so the force is off by 20% or more. Also, gas springs have seals that wear out over time \u2014 leak that nitrogen, and your spring is dead. We\u2019ve had customers swap out gas springs that only lasted 2 years because of seal leaks, while our constant force springs often run 10+ years with zero maintenance.<\/p>\n

Installation & Customization (No Headaches)<\/h4>\n

Gas springs require mounting brackets, they\u2019re one-directional mostly, and you have to order exact lengths and force ratings \u2014 if you mess up, you wait a week for a custom order. Constant force springs? We can cut them to any length, any force, in hours. You mount them with a simple screw pin, no fancy brackets. And they work in almost any direction \u2014 pull, push, sideways, upside down \u2014 as long as you guide the strip. I once helped a small robotics team build a custom arm using a constant force spring they modified themselves, no special tools needed. Gas springs are way more limited on movement direction.<\/p>\n

Where Gas Springs Still Make Sense (Don\u2019t Write Them Off)<\/h3>\n

Wait, I\u2019m not here to say gas springs are garbage \u2014 they\u2019re perfect for certain jobs. If you need controlled, damped movement, like lowering a heavy tailgate slowly, gas springs do that better. Constant force springs just pull\/push, they don\u2019t have built-in damping. If you need a one-time push or lift, not continuous tension across the whole travel, gas springs are fine. But for 90% of the applications that need steady, consistent force? Constant force springs are better.<\/p>\n

The Bottom Line For Builders<\/h3>\n

<\/p>\n

Here\u2019s the thing I tell every engineer who hits me up: if your project needs force that stays the same the entire length of movement, if you\u2019re tight on space, if you work in extreme temps, or if you want something that lasts without maintenance, constant force springs are the way to go. Gas springs are great when you need slow, controlled lowering or one-directional lift, but most of the time, you\u2019re overcomplicating things by reaching for the gas spring first.<\/p>\n

Torsion Springs<\/a> If you\u2019re working on a project right now and aren\u2019t sure which one fits \u2014 drop us a line, we\u2019ve helped everyone from small startup teams to big manufacturing companies pick the right spring for their build. No pressure, no fancy sales talk, just real advice from someone who\u2019s been in this game for years, testing these things out in actual jobs, not just lab reports.<\/p>\n

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References<\/h3>\n
    \n
  1. Constant Force Spring Design and Application Guide, Spring Manufacturers Institute (SMI), 2022<\/li>\n
  2. Gas Spring Performance Characteristics, Society of Automotive Engineers (SAE) International, 2021<\/li>\n
  3. Material Science for Precision Springs, Journal of Mechanical Design, 2020, Vol. 142, Issue 8<\/li>\n<\/ol>\n
    \n

    Wenzhou Huajie Precision Spring Co., Ltd.<\/a>
    As one of the most professional constant force spring manufacturers and suppliers in China, our products have good reputation in the market. Please rest assured to wholesale bulk constant force spring in stock here and get pricelist from our factory. We also accept customized orders.
    Address: No.6 Chuangsan Road, Lingang Industrial Zone, Yueqing, Wenzhou City, Zhejiang Province, China.
    E-mail: ZGhuajieTH@163.com
    WebSite:     https:\/\/www.huajiespring.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey folks, if you\u2019ve ever been deep in a machinery, automotive, or industrial design project, you\u2019ve … How do constant force springs compare to gas springs?<\/span>Read more<\/a><\/p>\n","protected":false},"author":98,"featured_media":536,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[499],"class_list":["post-536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-constant-force-spring-44fd-1dfe97"],"_links":{"self":[{"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/posts\/536","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/users\/98"}],"replies":[{"embeddable":true,"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/comments?post=536"}],"version-history":[{"count":0,"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/posts\/536\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/posts\/536"}],"wp:attachment":[{"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/media?parent=536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/categories?post=536"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.scmtscnc.com\/blog\/wp-json\/wp\/v2\/tags?post=536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}