Back Rings

Back to overview
Installation sketch Back Ring

The back rings of Freudenberg Sealing Technologies supplement and back up the O-ring. They act as a supporting element to prevent gap extrusion in radially sealing ISC O-rings. By expanding the use of O-rings to various shapes, back seals protect O-rings against damage.

Select your filter

polymer
material
brand
design

Filtered items for Back Ring ( 475 hits )

  design material d H brand item no. SP | IP    
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 2.44 1.14 Dichtomatik 67058930 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 3.23 1.14 Dichtomatik 67058931 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 3.56 1.14 Dichtomatik 67058932 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 3.56 1.14 Dichtomatik 67058979 Details
cross-section thumbnail Back Ring SRA SRA PTFE F52800 8 1 Freudenberg 39609 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 4.34 1.14 Dichtomatik 67058933 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 4.34 1.14 Dichtomatik 67058980 Details
cross-section thumbnail Back Ring SRA SRA PTFE F52814 9 1 Freudenberg 130394 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 5.13 1.02 Dichtomatik 67059054 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 5.13 1.14 Dichtomatik 67058934 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 5.13 1.14 Dichtomatik 67058981 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 5.94 1.14 Dichtomatik 67058935 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 5.94 1.14 Dichtomatik 67058982 Details
cross-section thumbnail Back Ring SRI SRI PTFE 177509 6 1 Freudenberg 49010166 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 6.73 1.02 Dichtomatik 67059055 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 6.73 1.14 Dichtomatik 67058936 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 6.73 1.14 Dichtomatik 67058983 Details
cross-section thumbnail Back Ring SRA SRA PTFE F52800 7.9 1 Freudenberg 97614 Details
cross-section thumbnail Back Ring SRI SRI PTFE F52803 8 1 Freudenberg 97625 Details
cross-section thumbnail Back Ring STU STU 90 NBR NB901801 8.3 1.02 Dichtomatik 67059056 Details

Back Rings from Freudenberg Sealing Technologies offer a high level of protection against damage

Back Rings from Freudenberg Sealing Technologies offer an exceptionally high level of protection against damage. Back Rings themselves have no sealing function, but are generally used in combination with the O-Ring. For example, to avoid gap extrusion of radially sealing ISC O-Rings by providing an extremely reliable reduction in the sealing gap on the low-pressure side. Back Rings are frequently used in hydraulics, for example in hydraulic valves and hydraulic pumps. Freudenberg Sealing Technologies Back Rings also provide exceptionally reliable sealing of ball valves or cylinder bases and heads, as required in general industrial applications.

Back Rings for use with O-Rings

Back Rings from Freudenberg Sealing Technologies are the ideal addition for use with the highly versatile O-Ring. They are used as a kind of backup. Back Rings ensure that an O-Ring maintains its round shape even at high pressures and thus withstands even high compressive loads without being damaged. This is achieved by mounting the Back Rings behind the O-Ring on the low pressure side under a one-sided compressive load. In situations with changing pressure directions, Freudenberg Sealing Technologies recommends the use of two Back Rings, used on both sides of the O-Ring.

Back Rings with assured quality

As with all of its products, Freudenberg Sealing Technologies also relies on the highest quality, durability and the best materials for the Back Rings. Most Back Rings are made from PTFE and can therefore easily withstand extreme temperatures of -200°C to 260°C. In addition, there are elastomer Back Rings that can be stretched and therefore easily mounted in installation grooves.

Range of Back Rings online

The complete range of Back Rings, including product and material data sheets, ordering options, prices and availability as well as dealer contacts, can be found in our FST e-catalogue.