If you’ve ever worked on industrial flooring, decking upgrades, or safety-related structural projects, you’ve likely crossed paths with grating clips. These small, unassuming fasteners play a huge role in keeping grating panels secure, load-bearing, and slip-resistant—whether that grating is for a factory catwalk, a loading dock, a mezzanine floor, or a drainage cover in a food processing plant. As a grating clip supplier with over 12 years in this space, I get so many questions from engineers, project managers, and maintenance teams that boil down to one core uncertainty: “Do grating clips come in different finishes, and does that even matter for my application?” Today, I want to pull back the curtain on our product line, break down why finishes aren’t just cosmetic, and explain how choosing the right finish can make or break the longevity and safety of your project. Grating Clips
Let’s start with a quick refresher on what grating clips are, just to set the stage. Grating clips are designed to lock two sections of metal grating together, or fasten a section of grating to a supporting frame, without drilling, welding, or specialized tools (for most standard installations). They slot over the edges of grating bars, tighten into place with a simple mallet strike or a wrench, and create a tight, rattle-free connection. Most are made from steel, since steel has the tensile strength needed to hold heavy loads and withstand environmental stress—but the finish applied to that steel is where the real versatility lives.
When I first started in this business, back when I was a junior sales rep and would sit in on site visits with our lead installers, I thought finishes were just for making clips look nice. That all changed on a job we did for a municipal water treatment plant in upstate New York. The project involved grating for walkways that ran directly above pools of chemically treated water, and the plant’s maintenance team initially ordered our standard zinc-plated clips for the job. By the time I did a follow-up visit six months later, those clips were showing rust spots, and several had started to loosen. The moisture in the plant, combined with exposure to harsh chemicals like chlorine and pH-adjusting solutions, had eaten through the zinc coating far faster than anyone expected. That’s when we learned that finish isn’t a afterthought—it’s a functional specification.
So, to answer the core question first: yes, grating clips absolutely come in different finishes, and each one is engineered for a specific set of conditions. Over the years, we’ve expanded our finish lineup to cover everything from general-purpose indoor projects to extreme outdoor and industrial environments. Let’s walk through each of the most common finishes, what they’re best for, and the pros and cons to consider.
First, the standard finish for most general applications: zinc plating. This is the workhorse of grating clips, and it’s what we stock most of for same-day shipments. Zinc plating works via a process called electroplating, where a thin layer of zinc is bonded to the steel surface. The zinc acts as a sacrificial barrier—meaning it corrodes before the underlying steel does, which protects the clip from rust for a set period of time. For projects that are indoor, low-moisture, and don’t involve harsh chemicals—like a retail store’s mezzanine, a warehouse catwalk, or a office building’s roof access grating—zinc-plated clips are more than sufficient. They’re affordable, easy to find, and hold up well for 5 to 10 years in these conditions. The downside? They don’t do well with constant moisture, high humidity, or chemical exposure. That’s why they failed at the water plant.
Next up, hot-dip galvanizing (HDG). If you’ve ever worked on outdoor construction projects, you’ve definitely heard of hot-dip galvanizing. This finish is applied by dipping fully assembled clips into a bath of molten zinc, where the zinc bonds to the steel at a molecular level, creating a much thicker, more durable coating than electroplated zinc. HDG clips are the go-to for outdoor applications: loading docks, bridge grating, park boardwalks, coastal infrastructure, or any project that will be exposed to rain, snow, salt air, or extreme temperature fluctuations. The coating thickness for HDG clips is typically 2 to 8 mils, compared to just 0.5 to 1 mil for electroplated zinc, so it’s far more resistant to chipping, scratching, and corrosion. We had a project last year for a coastal marina in Florida that used HDG clips for their floating dock grating; two years later, those clips are still as rust-free as the day they were installed, which is a huge win given the constant salt spray. The only minor downside of HDG is that it can have a slightly rougher, less uniform finish than electroplated zinc, which is a consideration if appearance matters for your project.
For even harsher environments, we offer polyester powder coating. Powder coating is a dry finishing process where a pigmented, electrostatically charged powder is applied to the clip surface, then cured in an oven to create a hard, protective layer. This finish is a step above galvanizing when it comes to chemical resistance, and it’s also highly customizable. We can apply powder coating in almost any color, which makes it popular for aesthetic projects—like retail spaces where the grating needs to match the building’s interior, or stadiums where the grating is part of a branded space. But the real superpower of powder coating is its resistance to specific chemicals. For example, food processing plants that use harsh detergents, pharmaceutical facilities that work with acidic or alkaline solutions, and automotive shops that are exposed to oils and solvents all rely on powder-coated clips. We recently supplied clips to a craft brewery in Oregon, where their floor grating is constantly exposed to beer, yeast, and cleaning chemicals; after three years, those clips show zero sign of corrosion, whereas electroplated clips would have started rusting within a year. The one thing to note here is that powder coating can chip if the clips are installed roughly or if the grating is subjected to heavy, sharp impacts, so it’s best paired with a protective layer like galvanizing underneath the powder. That’s why all our powder-coated clips first get a HDG base coat, then the powder layer on top—giving you the best of both worlds.
Another finish we offer is 304 stainless steel. This is the most heavy-duty option, designed for environments where corrosion resistance is non-negotiable, and appearance is also a priority. Stainless steel doesn’t rely on a coating to protect the underlying material—its chromium content forms a self-healing oxide layer when exposed to oxygen, which prevents rust. 304 stainless steel clips are ideal for food and beverage processing facilities, medical labs, coastal construction where salt exposure is extreme, and even architectural projects where the metal needs to look polished and new for decades. We did a project a few years ago for a seafood processing plant in Alaska, where the constant saltwater spray and freezing temperatures would have destroyed any coated clip; the stainless steel clips we supplied are still in perfect condition after five years. The tradeoff, of course, is cost—stainless steel is significantly more expensive than coated steel, so it’s best reserved for high-stakes, long-lifespan applications where the extra cost is justified.
Wait, there’s one more finish I should mention: plain black oxide, sometimes called black rust inhibitor. This is a thin, black coating that’s primarily used for indoor applications where appearance is important, but corrosion resistance isn’t a top priority. It’s often used for projects like exhibition floors, stage grating, or other temporary installations where the clips won’t be exposed to moisture or chemicals. It’s affordable, looks sleek, but it’s not designed for long-term outdoor use—so I always caution customers not to use it for anything that will be outside year-round.
Now, I want to talk about a few common mistakes I see customers make when choosing a grating clip finish, because it’s not just about picking the most durable option—you have to match it to your project’s specific needs. The first mistake is overspending on a finish you don’t need. I can’t tell you how many times a customer will order stainless steel clips for a warehouse that only needs electroplated zinc, just because they think “stainless is better.” That’s like buying a industrial-grade chainsaw to open a package—wasted money. The second mistake is under spec’ing for the environment. The water plant project I mentioned earlier is a perfect example of this; the maintenance team chose the cheapest option and ended up having to replace all the clips six months later, which cost them more in labor and downtime than if they’d just ordered the right finish in the first place. The third mistake is ignoring installation factors. If your project involves heavy machinery moving over the grating, or frequent foot traffic with sharp objects, a powder-coated finish might chip, so you’d be better off with a galvanized finish that can handle impact without losing its protective layer.
Another thing I want to emphasize is that not all grating clip finishes are created equal. As a supplier, we test every batch of our finishes in-house, and we also use third-party labs to verify corrosion resistance. For example, we do salt spray tests per ASTM B117, which simulates exposure to salt spray for a set number of hours. Our HDG clips pass 1,000 hours of salt spray testing with zero red rust, our powder-coated clips pass 500 hours, and our stainless steel clips pass 2,000 hours. I’ve had other suppliers reach out to us offering cheaper clips with “galvanized” finishes, only to find out they used a thin electroplated coating that would rust after just 100 hours of salt spray. That’s why, when you’re choosing a supplier, it’s important to ask about their testing processes and finish specifications—not just the price.
I also want to address a question I get all the time: can I have a custom finish? The short answer is yes. We work with several customers who need specific colors for branded projects, or even custom coatings for exposure to unique chemicals. For example, a chemical manufacturing client recently asked for a clip that could resist exposure to hydrofluoric acid, which most standard finishes can’t handle. We partnered with a specialty coating manufacturer to develop a custom polymer coating that works for their application, and those clips have held up for three years now. If you have a custom need, just reach out—we’re happy to work with you to find a solution.
At the end of the day, grating clips are a small part of a larger project, but their performance is critical for safety, compliance, and long-term maintenance costs. A project’s entire grating system can fail if the clips aren’t properly secured and resistant to corrosion, which can lead to downtime, safety hazards, and costly repairs. That’s why taking the time to choose the right finish isn’t just a nice-to-have—it’s an investment in your project’s success.
If you’re currently working on a project and aren’t sure which grating clip finish is right for you, or if you have questions about any of our finishes, our team is here to help. We’ve supported projects of all sizes, from small retail renovations to large municipal infrastructure builds, and we can help you navigate the specifications, testing, and pricing to find the perfect solution for your needs. Don’t guess when it comes to the safety and longevity of your grating system—reach out to discuss your requirements with our team today.
FRP Pultruded Grating References:
- American Society for Testing and Materials. (2022). Standard Practice for Operating Salt Spray (Fog) Apparatus (ASTM B117).
- Steel Joist Institute. (2021). Specification for the Design, Fabrication, and Erection of Steel Joists, Joist Girders, and Grating.
- National Association of Corrosion Engineers. (2020). Corrosion Costs and Preventive Strategies in the United States.
Nantong Mach’s Structure & Design Co., Ltd.
Nantong Mach’s Structure & Design Co., Ltd. is well-known as one of the leading grating clips manufacturers and suppliers in China, featured by quality products and competitive price. Please feel free to buy bulk grating clips for sale here from our factory.
Address: No.301 Chenggang Road, Nantong, Jiangsu, China
E-mail: machsfrp@163.com
WebSite: https://www.chinafrpgrating.com/
