Custom molded rubber O-ring/round rubber sealing washer

A round rubber sealing washer should keep its inner edge supported around the opening as the joint closes. If the center clearance is too large or the mating face too narrow, the contact band can shift and leave uneven compression. Match the washer dimensions to the complete face geometry rather than a nearby O-ring size.

Select thickness and compound around the actual medium, temperature, and available gap. A conventional O-ring needs a different section and groove, so the chosen format should remain tied to the joint design. Check the fitting route for features that can cut or drag the rubber.

Place the washer flat and centered on clean surfaces. Close evenly and inspect for material displaced into the opening. During service, compare damage near the bore with the adjoining shoulder or passage. Correct a sharp or unsupported feature before replacement rather than choosing a tighter inner diameter that may stretch the washer and create a new distortion elsewhere in the contact band.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. If the center clearance is too large or the mating face too narrow, the contact band can shift and leave uneven compression.

Custom dimensions

A conventional O-ring needs a different section and groove, so the chosen format should remain tied to the joint design.

Fit & assembly

Place the washer flat and centered on clean surfaces.

Use & inspection

During service, compare damage near the bore with the adjoining shoulder or passage.

Photos illustrate structure or material only. A round rubber sealing washer should keep its inner edge supported around the opening as the joint closes. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.