Our hours are 8:00am - 5:00pm, Monday – Thursday & 8:00am – 4:30pm Friday EST. Orders received before 3pm EST will be shipped same day.
UPC Code: 40913594
NBR Back-up Ring
NBR, Buna N
Uncut, Dimensional stability of the O-Ring improves the sealing force and increases the service life. Preferably for static use.
General Back-up Ring Application:
Back-up Rings have no intended sealing function. Instead, as the name indicates they are supporting elements made with extrusion-resistant materials which generally have a rectangular cross section. They are installed in a groove together with an elastomeric sealing element preferably with a corresponding O-Ring in static applications. Due to the tight fit of the Back-up Ring in the housing, they prevent extrusion of the pressurized elastomeric sealing element into the sealing gap.
Used in a variety of applications such as with the use of O-Rings in high pressure applications, use of O-Ring materials with a low hardness, compensation of radial sealing gaps, use for internal and external sealing applications, reciprocating and rotating movements possible, compensation for large temperature fluctuations, static and dynamic applications.