{"id":578,"date":"2026-10-09T06:32:18","date_gmt":"2026-10-08T22:32:18","guid":{"rendered":"http:\/\/www.awdheshmehandiart.com\/blog\/?p=578"},"modified":"2026-10-09T06:32:18","modified_gmt":"2026-10-08T22:32:18","slug":"what-materials-are-used-to-make-bellow-type-load-cells-4cd2-2579e9","status":"publish","type":"post","link":"http:\/\/www.awdheshmehandiart.com\/blog\/2026\/10\/09\/what-materials-are-used-to-make-bellow-type-load-cells-4cd2-2579e9\/","title":{"rendered":"What materials are used to make Bellow Type Load Cells?"},"content":{"rendered":"

What materials are used to make Bellow Type Load Cells? Bellow Type Load Cell<\/a><\/p>\n

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If you\u2019ve ever had to spec or source load cells for packing lines, tank weighing, or even industrial process automation, you\u2019ve probably run into bellow type ones. They\u2019re kind of the unsung heroes of heavy-duty measurement\u2014flexible, durable, and built to handle messy, high-wear environments that would eat through other load cell types fast. But here\u2019s the thing: most people don\u2019t stop to ask what exactly goes into building these workhorses. As someone who\u2019s been supplying bellow type load cells for over a decade now, I\u2019ve gotten this question from new engineers just starting out, and seasoned maintenance techs who\u2019ve seen cheap knockouts fail way too many times. Let\u2019s break it down straight, no stuffy jargon, and talk about why every material choice matters.<\/p>\n

First off, let\u2019s get on the same page about what a bellow type load cell is, quick. Unlike flat beam or s-beam cells that have simpler outer casings, the \u201cbellow\u201d is the star here\u2014it\u2019s that flexible, accordion-shaped cover that wraps around the core strain gauge assembly. That bellow does more than just look cool, right? It keeps out dust, moisture, food debris, chemical splashes, whatever your industrial space throws at it. So every part of the cell, from that outer bellow to the innermost strain gauges, is picked to hold up to that protection.<\/p>\n

Let\u2019s start with the big one that everyone asks about: the bellow itself. This is the first line of defense, so you can\u2019t cheap out here. We use two main materials for bellows, and it all depends on the application. For standard industrial stuff\u2014like packaging lines, general tank weighing, indoor or mild outdoor use\u2014go-to is 300-series stainless steel, specifically 304 or 316. Wait, people mix these up all the time, so let\u2019s set that straight. 304 is the workhorse, cheap enough, resists rust from most common moisture, and holds its shape really well. It\u2019s perfect for places where the only \u201ccontamination\u201d is a little water from a floor wash or dust floating around. But if you\u2019re dealing with harsher stuff\u2014food and beverage plants, chemical processing, marine environments\u2014you step up to 316 stainless. That one has extra molybdenum in it, so it fights off acid splashes, saltwater, even harsh cleaning chemicals way better. I once had a customer who bought a cheaper load cell with a 304 bellow for their brewery\u2019s keg filler; it rusted through in 6 months from beer and sanitizer fumes. Switched to 316, and they haven\u2019t had an issue in 4 years. Trust me, that\u2019s not something you want to cut corners on.<\/p>\n

Wait, sometimes you\u2019ll see bellow type load cells with other materials, like nylon or plastic? Those are super niche, only for low-load, indoor, totally clean applications, right? We hardly ever stock those because even a little moisture or a dropped tool can crack them. So if a supplier tries to sell you a bellow cell with a plastic bellow for heavy industrial use, run. That\u2019s not built to last.<\/p>\n

Next, the core structure inside the bellow\u2014this is where the actual weight measurement happens, so material here is critical for accuracy, not just durability. The main body that holds the strain gauges? Again, stainless steel, but not the same as the bellow. We use 17-4 precipitation hardening stainless steel here, or sometimes called PH stainless. Why that? It\u2019s crazy strong, but also super stable dimensionally. That means when you put weight on it, it bends just the right amount, and springs back exactly to its original shape\u2014no permanent stretching, no drift over time. Think about it: a load cell\u2019s accuracy only works if the core doesn\u2019t change shape after 10,000 weigh cycles. 17-4 holds that. We also machine it to really tight tolerances\u2014like a few thousandths of an inch\u2014so that the strain gauges get consistent, repeatable signals every time. No wonky readings that make you throw out a whole batch of goods because the scale was off.<\/p>\n

Now, the strain gauges themselves\u2014those are the tiny, sensitive things that turn force into an electrical signal, right? You can\u2019t see them, they\u2019re glued to the core structure, but their material choice is make-or-break. Most strain gauges in industrial load cells are made from thin metal foil, usually constantan alloy. Constantan is perfect here because it has a stable electrical resistance that changes predictably when it\u2019s stretched or compressed by weight. Some high-precision ones use even better alloys, like karma or platinum-tungsten, for super accurate measurements, but constantan is the standard for 90% of industrial bellow cells because it\u2019s reliable and doesn\u2019t break the bank. We only go for the higher-end gauges if a customer needs lab-level accuracy, like for pharmaceutical weighing.<\/p>\n

Then there\u2019s the adhesive that glues those strain gauges to the core. Another thing people sleep on! You can have the best gauge and best core, but if the glue fails, you get bad readings or a broken cell. We use cyanoacrylate (super glue, basically) for standard applications, but for harsher, high-temperature environments, we switch to epoxy or even polyimide adhesives. That glue has to be strong enough to hold the gauge tight through thousands of expansions and contractions, resistant to chemicals, and not change its properties with temperature shifts. If the glue gets soft from heat or contaminated with oil, the gauge will slip, and your readings start going haywire. I\u2019ve seen a whole line stop production because a load cell\u2019s gauge glue dissolved in hydraulic fluid\u2014cost that customer way more than spending an extra $20 on the right adhesive up front.<\/p>\n

Wait, what about the electrical connections? That\u2019s another part inside the bellow. The wires that carry the signal from the strain gauges to the outside world\u2014we use copper wires insulated with PVC or Teflon, depending on temperature. For cold environments, like freezers that go down to -40\u00b0F, PVC gets brittle, so we use Teflon insulation. For hot environments, like metal stamping plants where it\u2019s up to 250\u00b0F, Teflon is also better because it doesn\u2019t melt or break down. And to seal those connections tight, we use polyurethane or silicone sealants. Silicone is better for low temperatures, polyurethane for higher chemical resistance. The goal here is that no moisture or dust gets into the signal wires\u2014if it does, you get static, dropouts, or total signal loss. We had one customer in a steel mill where the humidity was super high; they were using load cells with bad insulation, and the signal would cut out every time it rained. Switched to our Teflon-insulated wires and silicone seals, no more issues.<\/p>\n

Let\u2019s not forget about the optional add-ons that some bellow cells have, because those material choices matter too. Some have a hermetically sealed connector\u2014those use glass-fiber seals instead of rubber, so they\u2019re totally airtight for explosive environments or super harsh chemical plants. Others have a coating on the outside of the bellow, like epoxy or powder coat, for extra scratch resistance in places where forklifts or heavy equipment might bump them. That\u2019s a good add for warehouse areas where damage is common, but again, only works if the base bellow is stainless steel.<\/p>\n

Now, why does all this material stuff matter for you, the person buying or using these load cells? A lot of suppliers will cut corners here\u2014they\u2019ll use cheaper 200-series stainless steel for the bellow instead of 304, or regular steel for the core instead of 17-4, to save a few bucks. But what happens then? The bellow rusts through in a year, the core stretches and drifts, the strain gauges slip. You end up spending more on replacements, downtime, lost product, than if you\u2019d just bought a good quality cell with the right materials in the first place. I see this all the time\u2014customers come to us after buying 3 cheap load cells in 2 years, and one of our well-built cells lasts 5 years for the same price. That\u2019s the ROI, right?<\/p>\n

As a supplier, I get it\u2014price is a big factor. But you can\u2019t compromise on the materials that protect the core measurement parts. When we spec out a bellow type load cell for a customer, we first ask what environment it\u2019s going in: is it food grade? Do they need it for high temperature? What\u2019s the load range? Then we pick the exact stainless grade for the bellow, the core material, the strain gauge alloy, the adhesive, the wires, everything. No one-size-fits-all here. For example, a cell for a produce packing line in a mild climate gets 304 bellow, constantan gauges, PVC insulation. A cell for a marine cargo scale gets 316 bellow, karma gauges, Teflon insulation, glass seals. A cell for a paint mixing tank gets 316, epoxy adhesive, polyurethane seal. It all lines up.<\/p>\n

I\u2019ve had customers ask me if there\u2019s a \u201cbetter\u201d material than stainless steel for bellow cells. Honestly? For 99% of industrial applications, no. Stainless is the sweet spot\u2014strong, corrosion-resistant, workable, affordable. The only time you might use something else is super specific, like titanium for ultra-high-load cells in deep sea applications, but that\u2019s super niche and way more expensive. For 90% of what people need, stainless is the way to go.<\/p>\n

Another thing that\u2019s not a material, but ties into material choice: how the parts are finished. For the bellow, it\u2019s not just the grade of stainless, it\u2019s how it\u2019s welded and polished. A well-made bellow has TIG-welded seams, not spot-welded, so there\u2019s no weak point where rust can start. The edges are rounded, not sharp, so they don\u2019t catch on stuff or crack over time. For the core, it\u2019s stress-relieved after machining, so it doesn\u2019t warp as it\u2019s used, which keeps the measurements accurate. That\u2019s part of the material process too\u2014working with the material properly so it performs as intended.<\/p>\n

Let me wrap this up, because I know when you\u2019re looking for load cells, you just want to know what to look for to make sure you\u2019re getting something that works. The next time you\u2019re shopping for bellow type load cells, don\u2019t just ask the price. Ask: what stainless grade is the bellow made of? What\u2019s the core material? What alloy are the strain gauges? What\u2019s the insulation on the signal wires? If the supplier can\u2019t answer that, or tries to give you vague answers like \u201cstainless steel for all parts,\u201d be wary. We always give that info upfront, because we stand by the materials we use\u2014we don\u2019t cut corners.<\/p>\n

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If you\u2019re tired of load cells that fail too soon, give us a shout. We can help you spec the right bellow type load cell for your exact application, no guesswork, no cheap parts that will leave you high and dry. Just tell us what you\u2019re weighing, the environment it\u2019s in, and any accuracy or durability needs, and we\u2019ll hook you up with something that lasts.<\/p>\n

Sensor Accessories<\/a> References:<\/p>\n

    \n
  1. Load Cell Handbook: Design, Selection, and Application, 5th Edition, CRC Press<\/li>\n
  2. Stainless Steel Materials Selection Guide for Industrial Components, American Iron and Steel Institute<\/li>\n
  3. Strain Gauge Technology for Industrial Measurement Systems, Omega Engineering Technical Manual, 2021<\/li>\n
  4. Bellow Type Load Cell Design and Corrosion Resistance Standards, International Organization for Standardization (ISO) 10360-6:2019<\/li>\n<\/ol>\n
    \n

    Huzhou Zhihe Technology Co., Ltd.<\/a>
    We’re well-known as one of the leading bellow type load cell manufacturers and suppliers in China, also support custom service. Please feel free to wholesale high quality bellow type load cell made in China here from our factory. For more information, contact us now.
    Address: Science and Technology Park, No. 333 Changhong Middle Street, Fuxi, Deqing,Zhejiang, China (Moganshan National High-tech Zone)
    E-mail: Fonda@zhihe-tech.com
    WebSite:     https:\/\/www.zhihe-tech.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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