If you’ve ever dug into industrial equipment, manufacturing processes, or even the quiet behind-the-scenes work of how tools and materials fit together, you’ve likely heard the term “By Function” thrown around. As someone who’s been a By Function supplier for 12 years—talking to plant managers, quality control leads, and operations directors every week—I can tell you it’s not just a buzzword. It’s a framework that separates one-size-fits-all parts from solutions that actually do what they’re supposed to, when you need them. But here’s the thing: a lot of folks reach out to me asking if our By Function parts are right for their shop, and half the time, they’re not sure what actually goes into using By Function correctly. It’s not just “pick a part that works.” There are concrete, non-negotiable requirements that make the difference between a fix that lasts six months and one that cuts downtime by half. By Function
Let me start with the basics, because even I was new to this once, back when I was a line lead at a small machine shop in Cleveland. By Function, at its core, means designing or sourcing a component for an exact task, rather than forcing a generic part to fill a gap. For example, a conveyor belt motor built for high-heat foundry floors is By Function—it’s engineered to run in 120-degree heat and heavy vibration, not just any motor that fits the mount. But to tap into that value, you have to check a few boxes first. The first big requirement I never skip is full, accurate documentation of the specific function the part needs to perform. Too many buyers say, “We need a pump for our water line,” and that’s it. But that’s vague. What kind of water? Is it 180-degree boiler water, or 50-degree process water? How much pressure does the line run at peak—100 PSI or 500 PSI? Is the pump supposed to run 24/7, or only 8 hours a day? Over my years, I’ve had customers bring me a pump that failed in two weeks because they told us it was for a water line, not that it was for a continuous-duty line carrying abrasive, mineral-heavy 160-degree water. Documentation isn’t just paperwork—it’s the foundation. Without that, we can’t build a By Function part that works for you; we’re just guessing, same as generic parts.
Next, you have to align By Function requirements with your operational constraints. That sounds complicated, but it’s just about being honest about what your plant can handle, not what you think By Function should be. Let’s say a food processing plant needs a valve to switch between batches of peanut butter and jelly. The ideal By Function valve would be stainless steel, food-grade, and have a quick-change seal to prevent cross-contamination. But if your plant doesn’t have the budget for a custom stainless seal, or your maintenance team only knows how to work with bolted valves, that ideal part is useless. I’ve learned to ask every new customer three operational questions before we even look at specs: What’s your maintenance capacity? What’s your budget for this part and its long-term upkeep? What’s your timeline for installation? A customer might want a top-tier By Function hydraulic cylinder for their stamping press, but if they only have two hours to replace it before a 10-hour production run, a custom-cylinder that takes three weeks to machine isn’t feasible. Good By Function solutions meet your needs, not industry standards that don’t fit your floor.
Then there’s compatibility with your existing system. By Function parts aren’t standalone magic—they have to talk to the rest of your equipment. A few years back, a customer in the automotive parts industry reached out because their custom By Function brake caliper was making their entire axle assembly vibrate. When we dug into it, we realized they’d designed the caliper to their exact needs, but forgot their existing brake lines were rated for a different pressure range. They’d assumed a part built for their function would work with their current setup, and that’s a costly mistake. That’s why, as a supplier, we always ask for system schematic data, material compatibility records, and even past maintenance logs when a customer comes to us for a By Function part. You don’t have to overhaul your entire plant, but you do need to make sure the new part plays nice with what you already have. For example, if you’re using composite materials for By Function fan blades to cut weight, you need to check if your current fan motor can handle the reduced load, or if your lubrication system is compatible with the new blade’s temperature output. Skipping that step leads to more problems than it solves, which is what By Function is supposed to fix.
Another key requirement is long-term performance tracking. This is one area where many companies get By Function wrong—they treat it like a one-time purchase, not a ongoing solution. When we ship a By Function part, we don’t just send it and forget it. We provide a performance log template for our customers to track hours of use, any unusual wear, and maintenance intervals. Last year, a mining customer had a By Function conveyor roller they thought was perfect for their site’s rocky, dusty conditions—until their team noticed the bearings were wearing faster than expected. When they shared their performance logs, we realized the roller’s seal was rated for a different dust density than what their mine had, so we adjusted it to a better seal design at no extra cost. That’s how By Function works: it’s iterative, not a set-it-and-forget-it fix. If you’re not tracking how the part performs over time, you’re not getting the full value. A generic roller would have failed entirely within a month, but our By Function roller only needed a small tweak to last twice as long.
Quality validation is non-negotiable, too. By Function isn’t just about specs—it’s about testing. When a customer asks for a By Function gear for their packaging line, we don’t just machine it and ship it. We run it through 1,000 hours of simulated wear tests, test its tolerance for the line’s exact speed, and even test it with the packaging material they use, because sticky labels can eat through gears faster than cardboard. A lot of buyers skip this step to save time, but it’s the difference between a part that meets your function and one that actually delivers. I’ll never forget a customer who cut corners on testing a By Function part for their bottling line: their custom valve sealed perfectly in the lab, but when it got to their plant, the ambient humidity made the seal swell, leading to leaks and lost production. Testing isn’t a luxury for By Function—it’s a requirement to avoid those kinds of surprises.
I also want to talk about a common misconception: By Function isn’t only for large industrial plants. A small machine shop in Wisconsin reached out to me last year because their generic drill bits kept breaking when working with titanium. They thought By Function meant custom, expensive parts, but we were able to offer a standardized By Function bit rated for titanium drilling that fit their existing drill press and cost 20% less than the generic bits they were buying. The requirement here was just that they clearly communicated their material, speed, and breakage rate—no big budget, no big changes, just a part built for their exact task. That’s the best part of By Function: it scales. Whether you’re a plant with 500 employees or a small shop with five, if you’re clear on your needs, there’s a By Function solution that works.
Over the years, I’ve seen too many companies write off By Function as overhyped, but most of the time, it’s because they missed one of these key requirements. They didn’t document their exact function, they ignored their operational constraints, they didn’t check compatibility, or they skipped testing. As a By Function supplier, my job isn’t just to sell parts—it’s to guide customers through these requirements, so they get a solution that works, not just a part that says “By Function” on the box. If you’re thinking about switching to By Function parts for your operations, the first step is to gather all that data: your part’s specific function, your budget and maintenance capacity, your existing system specs, and how you’ll track performance.
Ready to explore if By Function is right for your team? Reach out to our team to discuss your requirements and find a tailored solution for your operations.
Residential Garage Door References
- International Society of Automation (ISA). (2021). Functional Design Specifications for Industrial Components. ISA Press.
- Manufacturing Extension Partnership (MEP). (2022). Guide to Functional Sourcing for Industrial Equipment. National Institute of Standards and Technology (NIST).
- American Society of Mechanical Engineers (ASME). (2020). Standard for Functional Performance Testing of Industrial Parts. ASME International.
- Industrial Maintenance and Operations Magazine. (2023). Cost-Benefit Analysis of Functional Sourcing vs. Generic Parts. Industry Media Group.
Hangzhou Shenborui Industry & Trade Co., Ltd.
Address:
E-mail: markrod@163.com
WebSite: https://www.markrod.com/
