Hey everyone, if you’ve ever worked with industrial connectors—whether you’re an engineer on an assembly line, a maintenance tech troubleshooting a machine, or someone just trying to make sense of why some connections hold and others don’t—you’ve probably wondered: “How strong is this thing, really?” Today we’re talking specifically about THR connectors, and the question I get more than any other as a THR connector supplier is: “What’s their tensile strength?” THR Connector
First off, let’s cut the jargon a little because I know when you’re in the thick of a project, you don’t need a textbook definition to tell you if a connector is going to pull apart mid-operation. Tensile strength, basically, is how much pulling force a connector can handle before it breaks, separates, or stops working. For THR connectors—those Through-Hole Reflow ones, right? The ones that get soldered straight onto a PCB in that reflow oven process that’s super common in electronics manufacturing—their tensile strength isn’t a random number we pull out of thin air. It’s calculated based on their design, the materials we use, and how they’re assembled.
Let me break it down like we’re chatting over a coffee (which is way more fun than a specs sheet). When we build our THR connectors, we don’t just grab a plastic shell and a metal pin and call it a day. The pins that go through the PCB are key here. If the pin is too thin, or the solder joint isn’t strong enough, pulling on the connector will yank it right off the board. That’s a nightmare for anyone—whether you’re building a smart fridge that needs its sensors connected, a medical device that can’t cut power mid-test, or a satellite component that you can’t fix once it’s in space.
So what’s the actual number? I know that’s what everyone wants. From our testing, and from industry standards we follow (I’ll get to that later), most standard-grade THR connectors we supply have a tensile strength of anywhere from 50 N to 150 N. Wait, N is Newtons, for anyone who’s not a physics nerd—one Newton is about the force of holding an apple in your hand. So 50 N is like holding five apples steady; 150 N is holding 15 apples. That’s not nothing. But hold on—this isn’t a one-size-fits-all number. If you need something stronger, we can customize it, but let’s talk about what affects that number first.
The main factors? The pin gauge, the plastic housing material, and the solder joint quality. Let’s start with pin gauge. Our standard pins for THR connectors are usually 0.6 mm or 0.8 mm in diameter. Thicker pins mean more metal to hold onto, so higher tensile strength. But thicker pins also mean you need bigger holes in the PCB, which can be a problem if you’re designing a compact device. That’s where trade-offs come in—we work with clients all the time to find the sweet spot between strength and size. Then there’s the housing: we use high-temperature thermoplastics, like PBT or LCP, for our THR connectors because they don’t warp in that reflow oven (that 260°C heat is no joke) and they hold their shape when you pull on them. Cheaper plastics might melt a little during soldering, making the pin loose, and that drops tensile strength fast.
The solder joint is another big one. Even if the connector itself is strong, a bad solder joint will fail before the pin does. That’s why we test our connectors with industry-standard solder profiles to make sure the joint forms a solid metallurgical bond, not just a messy blob of solder. We’ve seen competitors cut corners here—they use too little solder, or a flux that doesn’t adhere well—and their tensile strength is way lower, like 20 N to 30 N. That’s enough to pull apart just by yanking on the cable, which is useless for most applications.
Wait, let’s talk about use cases because that matters more than just the number. If you’re building a consumer electronics device, like a portable speaker, the connector probably won’t get pulled that hard—50 N is more than enough there. But if you’re working on an industrial machine that has cables getting yanked around by conveyor belts, or an automotive component that has to withstand vibration and constant movement, you’ll want that higher end, 120 N to 150 N range. We also make heavy-duty THR connectors for things like robotics, where the connectors are under constant stress—those can go up to 200 N, but that’s custom stuff.
I get that a lot of people just go for the cheapest connector they can find, but I always tell them to ask for the tensile strength. A connector that’s rated for 50 N might look the same as one rated for 150 N, but one will fail in a month, and the other will last years. We’ve had a client come to us last year after switching to a no-name connector from another supplier—their line was down for three days because a bunch of connectors pulled off the PCBs during testing. They switched to our standard-grade THR connectors (80 N, in that case) and haven’t had an issue since. That’s the stuff we care about—solving real problems, not just selling parts.
Now, can you test this yourself? Absolutely, if you have a tensile tester, but most people don’t have that in their workshop. That’s why we publish our specs for every THR connector we make, and we offer sample testing for clients who want to verify. We also follow IPC standards—IPC-A-610, IPC-CC-830—those are the industry benchmarks for electronic components, so our testing is aligned with what the rest of the industry uses. No cutting corners here; we want our clients to trust that when they say “this connector needs to hold 100 N,” we’re delivering that.
Let’s also clear up a common misconception: tensile strength isn’t about how much weight you can hang from the connector. A 10 kg weight is about 98 N, so a 100 N connector would hold that, but in real life, you’re not hanging weights—you’re pulling the connector at an angle, yanking it while the machine is vibrating, or even someone accidentally tripping over the cable. That’s why we test in dynamic conditions too, not just static pull. A connector that holds 100 N static might only hold 60 N when pulled at a 45-degree angle, so we factor that into our ratings.
If you’re wondering why THR connectors specifically, vs. other types? Well, through-hole reflow soldering means they’re attached directly to the PCB, no crimping or extra hardware needed, and they have a much higher tensile strength than surface-mount connectors (SMDs). SMDs can be strong, but they’re glued on, so their tensile strength is usually around 30 N to 60 N, which is lower for most demanding applications. THR is the middle ground for many manufacturers—stronger than SMD, easier to assemble than through-hole connectors that have to be hand-soldered.
As a THR connector supplier, we also do custom work. If your project needs a specific tensile strength, or a different pin size, or a housing that fits your exact PCB layout, we can adjust that. We’ve built THR connectors for medical devices that need to be autoclaved (high heat and pressure) with a tensile strength of 120 N, and for agricultural equipment that has to handle dust and extreme temperatures with 150 N ratings. It’s all about matching the connector to the job, not just selling a pre-made part.
Wait, another thing: it’s not just the male/female connector pair, right? The tensile strength is measured with the connector soldered to a PCB, because that’s how it’s used. Testing it without the PCB would give a fake high number, since the pins themselves are strong, but the solder joint is the weak link. That’s why all our tensile tests are done with a standard FR-4 PCB, the most common type, so you know exactly what you’re getting.
I’ve had engineers tell me they’ve had connectors fail because the supplier didn’t disclose that the tensile strength was measured on the connector alone, not with a solder joint. That’s a big red flag. When we publish our specs, we clearly state that the tensile strength is with a properly soldered joint, per IPC standards. That’s non-negotiable for us—we don’t want our clients getting burned because of misleading numbers.
So to wrap this up, the short answer to “What’s the tensile strength of a THR connector?” is: it depends, but standard ones are 50–150 N, with heavy-duty options up to 200 N. The long answer is that it’s a combination of pin size, housing material, solder quality, and how you’re using the connector. If you’re not sure what you need, don’t guess. Reach out, tell me about your application—whether it’s a small consumer device, an industrial machine, medical equipment, or something else—and we can help you pick the right THR connector with the right tensile strength to keep your project running smoothly. No jargon, no hidden specs, just straight talk about a part that matters.
If you’re working on a project where connector reliability is non-negotiable, let’s chat. We can send you free samples, walk through our test data, and make sure you get exactly what you need without overpaying for more strength than you actually require. Don’t let a weak connector derail your timeline or cost you money—reach out today to discuss your requirements.
Board-to-Board Connector References:
- IPC Association Connecting Electronics Industries. IPC-A-610: Acceptability of Electronic Assemblies.
- IPC Association Connecting Electronics Industries. IPC-CC-830: Qualification and Performance of Electrical Insulating Compounds for Use in Electronic Equipment.
- Electronic Components Industry Association. Through-Hole Reflow Soldering Guidelines for Connectors.
Wenzhou JKUN Connector Co., Ltd.
As one of the most professional thr connector manufacturers and suppliers in China, we’re featured by quality products and low price. Please rest assured to wholesale bulk customized thr connector from our factory. For quotation and free sample, contact us now.
Address: No.2667, Ningkang East Road, Yueqing City, Zhejiang Province, China
E-mail: sales@cnjkun.com
WebSite: https://www.jkunjcj.com/
