X-Rings are a torus (donut) shaped seal with a clover shaped cross section. X-Ring type seals offer two sealing surfaces per side as opposed to just one as in an O-ring. Because of the clover design, the X-ring has a lower Coefficient of Friction compared to the O-ring.
X-rings follow the same sizes as the AS568 standard O-rings and can be used in place of a standard O-ring. Satori Seal stocks X-rings in Nitrile 70 in the AS568 sizes. Click here for a reference chart.