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Custom O-Rings

Savvy is your trustable OEM manufacturer for custom o-rings and molded rubber o-ring seals.

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Most mechanical designers will primarily use standard o-rings when designing products, but when they cannot find available o-rings in standard o-ring sizes, they need to choose custom o-rings. Savvy has been in the OEM o-ring industry for many years and can design and produce custom rubber o-ring seals in various cross-sections and shapes.

Types of Custom O-Rings

Custom o-rings are mainly defined in terms of cross-section and outline shape.

1. If the cross-section is outside the range of the standard o-rings below, it is a custom o-ring.

Standard & Custom O-Ring Cross Section Sizes Reference Table
CountryStandardCross Section (mm)
UniversalISO 36011.82.653.555.37
ChinaGB/T 3452.1
GermanyDIN 3771
FranceNFT47 501
SwedenSMS l5861.62.435.78.4
JapanJIS B 24011.922.43.13.5
Preferred Metric Sizes11.522.53

2. Even if the cross-section is within the range of the above standard o-rings, its outline shape is not round, but square, rectangular, or other irregular shapes, they are also called custom o-rings.

For the first custom o-ring, we only need to know its inner diameter (ID) and cross-section (CS), and then we can make a mold for production. For the second case, usually, the designer needs to design a drawing, and then send the drawing to us, so that we can make the mold and produce the products according to your drawing. If the customer cannot provide a drawing, we can also design it. Of course, this requires a lot of communication and close cooperation between the two parties to finally complete a perfect customized o-ring.

Due to the unconventional nature of custom o-rings, they are used in much less volume than standard o-rings, so their price is higher. Since Savvy has a strong cost control management, our price is always at a very low level in the China market while keeping the high quality.

Material, Hardness and Color

Like standard o-rings, custom o-rings can be made of exactly the same material, hardness, and color. The materials mainly include NBR, HNBR, FKM / Viton, Silicone, EPDM, PTFE, FFKM, etc. The hardness is generally between Shore A 60-90, and the color is usually black, brown, red, transparent, etc. We will complete the production according to the customer’s specifications.

Application of Custom O-Rings

Although custom o-rings are used less frequently than standard o-rings, they are still popular in a wide variety of modern industries. These versatile rubber seals are commonly used in the following industries:

  • Hydraulics & Pneumatic
  • Oil and Gas
  • Semiconductor Processing
  • Aerospace
  • Food Processing
  • Water Filtration
  • Electronic Products
  • Machinery Fabrications
  • Plastic Sealing
  • Automotive
  • Medical Equipment

However, to reduce procurement costs and lead times, we recommend considering standard o-rings first.

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