Rubber Component Solutions

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Precision Molded Rubber Parts

We are a comprehensive, responsive and cost-effective solutions provider for critical system components. Our fully vetted network of resources provides reliable and timely custom or standard precision-molded rubber components built to our customers’ exacting specifications. From O-rings to seals to custom-tooled parts and more, we handle all aspects of a project. We work as consultants and partners with our customers, offering decades of expert technical experience and unmatched service.


Rothkopf Differences


Our customers engage us as a trusted partner to source critical system components made from high-quality precision-molded rubber.



Our proprietary, fully vetted, reliable network of resources offers unmatched quality, production timeliness, and cost-effective solutions.



Our proactive approach, extensive experience, and customer-first service delivers exceptional value that is unparalleled in the marketplace.



Value is more important than cost at Rothkopf. A poorly sourced part at a lower price isn’t always the better choice, it is often a costly one, causing clients delays and potential project failures. The Rothkopf experience is better than a low price; we ensure that we are recommending/sourcing the right part for your project, every time.

Who We Are

Our Story

Rothkopf excels at delivering the right rubber assembly component at the right time and at the right price. These components are critical in our customers’ product performance or operations, and they trust us to provide the highest quality product every time with no margin for error.

Your source for precision molded rubber products


O-rings are one of the most common rubber components today and are used in pumps, cylinders, valves, and so much more.


Seals for a broad range of applications are available, including hydraulic, piston, shaft, wipers, buffers, wear rings, and custom-tooled.

Back-up Rings

Back-up rings work with an O-ring in higher pressure and temperature applications to prevent the O-ring from extruding into the clearance gap between sealing surfaces.


Lathe-Cut rings have a square cross-section profile, perform well in static applications, fit in O-ring grooves, and are interchangeable size-for-size with standard O-rings.

Oil Seals

Oil seals, rotary shaft seals, and V-rings are used to seal in system fluids and lubricants while keeping out dirt and contaminants. 


X-Rings have a four-lobed cross-section profile that provides twice the sealing surface of an O-ring, fit in O-ring grooves, and are interchangeable size-for-size with standard O-rings.


U-cups or Lip seals perform well in rod, piston, reciprocating, and some rotary applications.  As pressure increases, the “U” shape self-energizes to maintain sealing effectiveness.


By definition, rubber diaphragms are flexible seals that prevent unwanted transmission of substances between two places. These substances can be liquid, gasses, or solutions. They are characteristically tough and dynamic and essential in many flow control applications.

Cord Stock

Cord stock is O-ring material ready to be cut to create custom size O-rings. There is a large selection of cross-sections available and can be cut to any length you need or in standard put-up lengths. 


Our rubber gaskets can seal items, stop vibration, and reduce noise pollution.

Custom Parts

Custom parts can be anything from a unique shaped widget or just a standard style part (O-ring) with a non-standard set of dimensions.

O-Ring Sizing

The standard sizes that are typically used by manufacturers in the United States are strictly defined by Aerospace Standard AS568B, Aerospace Size Standard for O-rings.


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