Factory supply hot sale rubber seal black o rings rubber washers

Black o rings need clear identification when several sizes or compounds are used in one assembly area. Similar color and appearance can conceal differences in section diameter that change the installed compression. Keep each ring associated with its intended groove and material so a convenient nearby spare does not alter the joint.

Compare the ring section and installed diameter with the retaining geometry. Rubber washers use a flat face contact and should be identified separately, even if their inner and outer dimensions seem close to those of a ring. Select the compound around the actual medium, temperature, and movement.

During assembly, protect the sealing surface from threads or sharp steps and position the ring without twist. Close the joint evenly and check for pinching where accessible. On removal, examine the worn part alongside its mating surface before discarding it. A concentrated cut or extruded region may reveal a hardware problem that requires correction, while a simple size substitution could leave the same cause in place.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. Similar color and appearance can conceal differences in section diameter that change the installed compression.

Custom dimensions

Compare the ring section and installed diameter with the retaining geometry.

Fit & assembly

During assembly, protect the sealing surface from threads or sharp steps and position the ring without twist.

Use & inspection

On removal, examine the worn part alongside its mating surface before discarding it.

Photos illustrate structure or material only. Similar color and appearance can conceal differences in section diameter that change the installed compression. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.