Custom made round rubber washer/rubber gasket/rubber seal

A round rubber washer should remain concentric with the feature it surrounds as the connection closes. The outside shape may be circular, but uneven support or a large center clearance can still let it move off the intended contact band. Match the inner diameter, outer diameter, and thickness to the complete joint rather than selecting from a single visible measurement.

Check the mating faces for shoulders, recesses, or fasteners that alter support. Select the rubber compound for the contacting medium and temperature. If the part is used as a seal, the closed assembly needs a continuous supported contact path around its opening.

Place the washer flat before bringing the faces together. Inspect for a shifted edge where access allows and avoid using a rotating fastener to pull the rubber into position. During maintenance, look for wear concentrated on one side, which can indicate locating or alignment problems. A replacement should restore the intended seat instead of merely covering the same opening with an approximate ring.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. Choose a grade that works with the washer contact band and central clearance, checking that closing compression does not displace the ring sideways.

Custom dimensions

Match the inner diameter, outer diameter, and thickness to the complete joint rather than selecting from a single visible measurement.

Fit & assembly

Check the mating faces for shoulders, recesses, or fasteners that alter support.

Use & inspection

During maintenance, look for wear concentrated on one side, which can indicate locating or alignment problems.

Photos illustrate structure or material only. The outside shape may be circular, but uneven support or a large center clearance can still let it move off the intended contact band. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.