OEM Custom NBR rubber round washers/sealing O-rings

NBR rubber round washers provide a custom annular component for a selected sealing interface. The inner and outer dimensions should place the rubber over the intended contact land without covering a passage or leaving a sealing edge unsupported. The washer's position matters as much as its nominal outside size.

Center the part before the adjoining surfaces are brought together. If the washer shifts as the joint closes, one side can be pinched while the other loses useful contact. The seat or assembly method should help keep it in place through tightening. The chosen thickness should suit the planned compression and final position of the mating parts.

NBR selection should follow the actual medium and local operating conditions. The complete joint determines pressure and sealing performance. During service, remove old material from the seat and inspect the faces for damage. Replace with the specified profile rather than a ring of similar diameter, since a different cross-section can change how the seal is supported and compressed.

Material options

NBR. Custom formulation and color for the intended contact conditions.

Hardness selection

Rubber: 30–90 Shore A. The chosen thickness should suit the planned compression and final position of the mating parts.

Custom dimensions

The washer's position matters as much as its nominal outside size.

Fit & assembly

The seat or assembly method should help keep it in place through tightening.

Use & inspection

During service, remove old material from the seat and inspect the faces for damage.

Photos illustrate structure or material only. If the washer shifts as the joint closes, one side can be pinched while the other loses useful contact. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.