O Ring Rubber Seals/ EPDM/HNBR/NBR Small Rubber Ring

O ring rubber seals provide flexible sealing elements for matching seats, with EPDM, HNBR and NBR among the available compound choices. Small rings can look similar despite differences in section or material, so the selected version should remain identifiable through storage and assembly.

Match the ring dimensions to the groove or mating feature, including the section that will be compressed. Use the chosen formulation for the actual fluid and temperature exposure rather than exchanging materials simply because the rings share a color.

Keep parts in a clean, relaxed condition until fitting. A small ring caught under other hardware may be stretched or nicked before it reaches the joint. Guide it into place without twisting and check that it sits evenly before the assembly closes. During maintenance, inspect the old contact pattern and the seat for damage. Replace with the intended size and compound, preserving the original compression relationship. Mixing nearly identical rings from different assemblies can make later fault diagnosis difficult even when they initially appear to fit the same opening.

Material options

EPDM / HNBR / NBR. Custom formulation and color for the intended contact conditions.

Hardness selection

Rubber: 30–90 Shore A. O ring rubber seals provide flexible sealing elements for matching seats, with EPDM, HNBR and NBR among the available compound choices.

Custom dimensions

Match the ring dimensions to the groove or mating feature, including the section that will be compressed.

Fit & assembly

Guide it into place without twisting and check that it sits evenly before the assembly closes.

Use & inspection

During maintenance, inspect the old contact pattern and the seat for damage.

Photos illustrate structure or material only. Mixing nearly identical rings from different assemblies can make later fault diagnosis difficult even when they initially appear to fit the same opening. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.