Products

U-Cups

Ugly Part Relief Kit

Our Ugly Part Relief Kit is designed to alleviate headaches and stress around problematic parts in your supply chain.

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Rubber U-Cups

Rothkopf was established in 1956 with one goal in mind: to provide clients with the best quality rubber components. Since our founding, we have stayed true to this mission, always finding our clients the rubber parts they need, no matter how obscure or unique they may be. That’s because we have deep roots in the industry and know all the best manufacturers across the world. Whatever type of part you need, you can be sure we know the best place to get it based on your order size and budget. Learn more about the unique u-cup part below.

Your source for Rubber U-Cups

Unlike traditional O-rings that are rounded all the way around, u-cups have a u-shaped profile. This means they have inside and outside sealing lips, letting them work in dynamic and static applications with equal effectiveness. They come in different forms based on your specific application including deep, standard, and bevel-lipped u-cups, which are all the same in general but have different heights and depths between their cross-section and their lips.

Superior quality parts, every time.

Parts are manufactured using a selection of compounds:

Buna N/Nitrite (NBR)

Ethylene Propylene (EPDM)

Fluorocarbon (FKM)

Fluorosilicone (FVMQ)

PTFE Encapsulated

Hydrogenated Nitrile (HNBR)

Neoprene (CR)

Silicone (VMQ)

Teflon (PTFE)

Urethane

GLT/GFLT

Custom Formulated

Our parts comply with industry and agency standards as indicated:

Mil-Aero/GPL

NSF

FDA

UL Listed

OEM specified approvals

Product finishing options include:

Teflon Coating (PTFE Resin)

Internal/External Lubrication

Color Coding

Loaded versus unloaded

U-rings, no matter what style they come in, also have one other differentiating factor. They can be loaded or unloaded. Loaded ones have an O-ring within their seal, essentially acting as a secondary layer of protection. Unloaded u-cups, on the other hand, do not have an O-ring inside as this extra weight and friction are not needed in every application. If you are unsure about the best u-ring for your project, reach out to our team to get guidance. Our experts will be happy to help you choose what will work best.