Different sizes FKM rubber flat washer/gasket for flange

A rubber flat washer in a flange arrangement needs a supported contact width between its inner and outer edges. Selecting a size by outside diameter alone can leave a different opening or unsupported section within the joint. The actual mating faces should determine the full ring geometry.

For a Viton or FKM choice, define the material formulation around the sealed medium and service conditions. Similar ring shapes in other rubber families are separate selections, not automatically equivalent substitutes. The intended compression and fastening arrangement also need to be preserved.

Fit the washer flat on clean faces and check that it does not project into a required passage. Evaluate the complete assembly for its duty rather than assigning performance from the material name. During replacement, compare the bore and new-part thickness as well as the outside size. A washer with only one matching dimension can change the flange contact conditions even when its outer edge appears correctly aligned.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. The intended compression and fastening arrangement also need to be preserved.

Custom dimensions

Selecting a size by outside diameter alone can leave a different opening or unsupported section within the joint.

Fit & assembly

Fit the washer flat on clean faces and check that it does not project into a required passage.

Use & inspection

For a Viton or FKM choice, define the material formulation around the sealed medium and service conditions.

Photos illustrate structure or material only. Selecting a size by outside diameter alone can leave a different opening or unsupported section within the joint. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.