Other seal

x-ring (Quad ring)

It is a seal suitable for both static and dynamic sealing. X-rings originated from the need to eliminate the disadvantage of o-rings - which is their rewinding in the groove. The X-rings have approximately square cross-section with ring grooves. The placement of the x-rings in the groove corresponds to the dimensions of the classic o-rings, so they can be replaceable. As with o-rings, the x-rings are also defined by the inner diameter (d) and the thickness (h). The advantage of the use of x-rings is their greater use for rotary seals, greater stability in the installation space and less radial prestress in the groove. This reduces friction and wear and extends the seal life. X-rings can be used to seal grooves with a static seal to a pressure of 5 MPa when used with a support ring of up to 40 MPa. For dynamic sealing, pressures up to 5 MPa apply, with a support ring up to 20 MPa. X-rings are made from classical materials such as NBR (Butadiene Acrylonitrile Rubber) and FPM (Fluorouracil). However, they can also be made of EPDM material, silicone or other rubbers. As with o-rings, x-rings are also manufactured to DIN 3770.

Usit rings

Usit rings are used for static sealing of fittings and flange joints. They are made of an outer metal ring and on the inside of the vulcanized rubber trapezoidal rubber blade. This shape allows sealing of large joints. Uses can be customary and usable with an internal centering lip.

Usit rings are produced as standard by galvanized steel and NBR cutting edges. However, it is also possible to wear rings with FPM cutting edge, stainless steel, etc. Usual rings are suitable for mineral oils, water, air, etc. The temperature range is -30 ° C to + 100 ° C.

Flat gaskets made of copper, aluminum, steel and fiber

These sealing rings are manufactured in accordance with DIN 7603A - sealing rings, flanged seals, shaped flat seals, sealing washers. It serves to seal the dismountable sealing joints as compressed seals of the non-moving parts. These sealing rings enable their sealing to form a sealed joint, thereby preventing or limiting the penetration of sealing fluid through the joint of the machine parts. Before using the copper sealing ring, it is recommended that the ring be heated by heating in red and cooled in cold water.


These are flat gaskets mostly made of NBR rubber. Unlike cut seals, these rings are produced either by turning on CNC or molding in form. They have much lower dimensional tolerances.