Rothkopf

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Rothkopf Wholesale distribution of molded rubber assembly components. Are you looking for molded rubber components? Turn to Rothkopf. They first opened a location in St.

We provide components like; o-rings, gaskets, seals, and custom parts, to manufacturers producing consumer products. Located in Chesterfield, MO, this rubber supplier offers high-quality precision molded products and O-Rings to clients around the country and globe. Rothkopf has been a leading rubber supplier since 1956. Louis, MO, under the name R.F. Carlson Company. In 1984, after John Rothkopf purchased the business, they rebranded to form Rothkopf & Associates Inc. Rothkopf offers standard, metric, and custom O-rings available for bulk purchase. Their O-rings are manufactured with a wide array of compounds, including urethan, silicone, teflon, or a custom formula. As a quality-focused rubber supplier they also comply with standards set by Mil-Aero, NSF, and the FDA. No matter what you need, you can trust them to build the right product for you. Not looking for O-rings? They can also supply other rubber products, including:

* Seals

* Lathe cuts

* Quad rings

* U-cups

Just like their O-rings, all rubber products can be custom-made based on your needs. Get rubber products made to your exact specifications when you work with Rothkopf. All standard and custom-made products can be shipped anywhere in the United States and around the world. Call (636) 449-2376 today to place your order. You can also visit them online to learn more about their customization process.

Q4 is here—and for many manufacturers, that means 2027 planning is already underway.One question worth asking now:If one...
09/29/2026

Q4 is here—and for many manufacturers, that means 2027 planning is already underway.

One question worth asking now:
If one of your critical rubber components became difficult to source tomorrow, would you already have another qualified supplier ready?

An O-ring, seal, gasket, hose or grommet may be a small part of your finished product, but when it isn’t available, the impact on production can be anything but small.

At ROTHKOPF, we work with OEMs across the U.S. to help strengthen their rubber-component supply chains through:
• Alternative and second-source options
• Material and application support
• Domestic and global sourcing resources
• O-rings, seals, gaskets, hoses, grommets and custom rubber components
• A supplier relationship built around responsiveness and reliability

Whether you’re qualifying suppliers for a new program, reviewing your 2027 sourcing strategy, or simply looking for a dependable backup source, now is a good time to start the conversation.

Have a rubber component you’d like us to take a look at? Let’s talk.
Visit ROTHKOPF.com or send us a message.

Your most expensive component might be the one that costs $.50.Not because of what it costs to buy—but because of what i...
09/23/2026

Your most expensive component might be the one that costs $.50.

Not because of what it costs to buy—but because of what it costs when you don’t have it.

An O-ring, seal, gasket, grommet or hose may represent a tiny fraction of an OEM’s finished product. But the wrong material, inconsistent quality, a missed delivery, or an unexpected shortage can quickly become a much bigger problem.

That’s where the right supplier relationship matters. At ROTHKOPF, we work with manufacturers across the U.S. to help source the rubber components that keep their products—and production lines—moving.

Whether you're an engineer looking for the right component for an application or a purchasing professional looking to strengthen your supplier base, we'd like the opportunity to become a resource for your team.

Have a new project? A difficult-to-source component? Looking for a second source?

Let’s talk. Send us a message or visit ROTHKOPF.com and put our rubber component experience to work.

This Labor Day, we’re celebrating the people who make things happen.Behind every product made, every order shipped, ever...
09/04/2026

This Labor Day, we’re celebrating the people who make things happen.

Behind every product made, every order shipped, every problem solved, and every deadline met are hardworking people who keep American manufacturing moving forward.

At Rothkopf, we’re fortunate to work every day with engineers, purchasing professionals, production teams, suppliers, and manufacturers who know what it takes to turn ideas into finished products. We’re proud to play our small part by helping keep the components they need—O-rings, seals, gaskets, hoses, grommets and more—moving through the supply chain.

So today, Lowly O-ring is taking a well-deserved break. 🎣☕ We hope you get a chance to do the same.

From all of us at Rothkopf, thank you for the work you do, and have a safe and enjoyable Labor Day!

Manufacturing keeps moving—and the smallest components can have a big impact on keeping it that way.At ROTHKOPF, we know...
08/24/2026

Manufacturing keeps moving—and the smallest components can have a big impact on keeping it that way.

At ROTHKOPF, we know that sourcing rubber components isn’t just about finding a part. It’s about finding the right material, the right solution, and a supplier you can count on when quality, availability, and timing matter.

From O-rings, seals and gaskets to hoses, grommets and custom molded components, we help engineers and purchasing professionals simplify sourcing and strengthen their supply chains.

Whether you're working on a new application, looking for an alternate source, or trying to solve an existing supply challenge, our team is ready to help.

⚙️ Engineering a new product?
📦 Looking to strengthen your supplier base?
🔍 Having trouble sourcing a particular rubber component?

Let’s talk. Put ROTHKOPF’s experience, resources, and supplier network to work for you.

👉 Contact us today at ROTHKOPF.com and let’s see how we can help.

Q3 is upon us. Is your supply chain ready?As production ramps up for the second half of the year, having the right suppl...
07/08/2026

Q3 is upon us. Is your supply chain ready?

As production ramps up for the second half of the year, having the right supplier can make all the difference.

At ROTHKOPF, we help OEMs keep projects moving with:
✔ Reliable O-rings and sealing solutions
✔ Precision rubber components and assemblies
✔ Engineering knowledge you can count on
✔ Responsive service and dependable delivery

What's your biggest supply chain priority heading into Q3?
Lead times? Quality? Cost? Engineering support? Let us know in the comments—or send us a message. We'd love to learn more about your challenges and discuss how we can help.

Let's make Q3 your strongest quarter yet.

Trade show season is here, and the Rothkopf team has been out and about meeting customers, connecting with new people, a...
05/13/2026

Trade show season is here, and the Rothkopf team has been out and about meeting customers, connecting with new people, and spending time with some incredible exhibitors along the way!

We recently attended the D2P Show in Schaumburg, Illinois, and it was a great show with an awesome turnout. We truly appreciate everyone who stopped by our booth to chat and learn more about what we do.

Events like these are a great reminder of how valuable face-to-face conversations are and how strong the manufacturing community continues to be.

Thanks again to everyone who made the show such a success — we’re already looking forward to the next one! 👏

OEMs shouldn’t have to become experts in rubber materials and components just to get the right parts they need— that’s w...
04/24/2026

OEMs shouldn’t have to become experts in rubber materials and components just to get the right parts they need— that’s where we come in.

At Rothkopf, our team has decades of hands-on expertise and a trusted global network of manufacturing resources. We don’t just supply components — we strengthen your entire supply chain.

Think of us as an extension of your team, delivering reliability, quality, and efficiency where it matters most.

Have a question about a part? Having issues finding a part? Visit our website or give us call.
🌐 rothkopf.com
📞 636-449-2366



Address

555 Spirit Of Saint Louis Boulevard
Chesterfield, MO
63005

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm
Saturday 8am - 5pm
Sunday 8am - 5pm

Telephone

+16364492366

Website

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