X-Rings are double sealing four-lobe seals that are characterised by their square profile. The X-Ring is defined by its inner diameter d1 and its cord thickness d2.


Mode of action

The X-Ring is symmetrically shaped. It can adapt to every situation and withstand stress in any direction (radial, axial). The grouting increases dependent on the pressure. At high pressure should use Backup-Rings.


No risk of torsion and a low friction coefficient:
» by lubricious materials
» by low bias
» through fat reserves between the lips

A better seal (in relation to an O-Ring) is mainly caused by a duplicate contact. Due its geometry the X-Ring can be used in dynamic applications with rotating movements (1m?/?s).

X-Rings in dynamic applications

The main advantage of the X-Ring is its high stability in dynamic applications where O-Rings provide a low performance.

X-Rings have four lips, which result in greater sealing surface. The four-lip seal was developed to achieve an improved lubrication of the seal and to avoid a rolling of the seal or spiral errors.

In contrast to O-Rings, which can roll in the groove and can cause a rotation, X-Rings will slide easily on. Also in regards to spiral errors X-Rings are much more resistant.

Standards and Approvals

As it is the case with O-Rings, most X-Rings are produced in accordance for American Produced standards with inch sizes and AS numbers.

The dimensions of the X-Ring in accordance with the American standard AS568 and the associated O-Ring numbers. Compared to the grooves for O-Rings the standard grooves for X-Rings are deeper. For groove dimensions for X-Rings, there is a greater scope available, since X-Rings needs less pressure and can compensate for this. That means less friction and therefore less wear of the seal.