High quality molded wear-resistant round rubber washer/O-ring

A round rubber washer can encounter rotation during tightening even when its final service position is stationary. The face of a threaded cap or fastener may drag across the rubber as it turns, affecting how the washer reaches its seat. This assembly movement deserves separate attention from wear during normal operation.

Identify which adjoining surface rotates and which holds the washer in position. An inner edge that catches on the central feature can twist while the opposite face is being dragged around. Check the intended assembly method and the condition of those surfaces before attributing a damaged washer solely to its compound.

The custom bore and face dimensions should correspond to the actual connection, with any assembly aid limited to one compatible with the materials and application. Examine the washer after a representative fitting operation where practical. Circular scuffing, a rolled inner edge, and a local cut suggest different contact conditions. For an O-ring version, use the specified rounded section and seat rather than treating a flat washer as mechanically equivalent. The completed joint needs its own service evaluation.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. The face of a threaded cap or fastener may drag across the rubber as it turns, affecting how the washer reaches its seat.

Custom dimensions

The custom bore and face dimensions should correspond to the actual connection, with any assembly aid limited to one compatible with the materials and application.

Fit & assembly

For an O-ring version, use the specified rounded section and seat rather than treating a flat washer as mechanically equivalent.

Use & inspection

A round rubber washer can encounter rotation during tightening even when its final service position is stationary.

Photos illustrate structure or material only. Circular scuffing, a rolled inner edge, and a local cut suggest different contact conditions. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.