ERIKS X-ring FKM 75 51414 AS568-BS1806-ISO3601-201 4.34x3.53mm

You mainly use the black FKM* X-ring from ERIKS as a seal for lubricating and hydraulic oils at high temperatures in linear or rotational applications. The characteristics of this X-ring make it the ideal replacement for an O-ring seal in slow, dynamic applications. This seal is widely applicable and often found in the chemicals and hydraulics sectors, and in general industry.

* Viton, the brand name for FKM, may be more familiar to you.