Product Group
Seal back-up ring
65 different sizes · ID 30 – 160 mm
The table below lists the sizes in this group. If you know the size you need, search within a tolerance in the size finder and request a quote directly from the results.
Size table
Dimensions are in millimetres.
| Inner diameter | Outer diameter | Height | Material | Product name |
|---|---|---|---|---|
| 30 | 40 | 3 | — | 030X040X3 U-CUP BACK-UP BRONZE |
| 35 | 45 | 3 | — | 035X045X3 U-CUP BACK-UP BRONZE |
| 35 | 50 | 3 | — | 035X050X3 U-CUP BACK-UP |
| 40 | 50 | 3 | — | 040X050X3 U-CUP BACK-UP |
| 40 | 55 | 3 | — | 040X055X3 U-CUP BACK-UP |
| 45 | 55 | 3 | — | 045X055X3 U-CUP BACK-UP |
| 45 | 60 | 3 | — | 045X060X3 U-CUP BACK-UP |
| 50 | 60 | 3 | — | 050X060X3 U-CUP BACK-UP |
| 50 | 63 | 3 | — | 050X063X3 U-CUP BACK-UP |
| 50 | 65 | 3 | — | 050X065X3 U-CUP BACK-UP |
| 50 | 70 | 3 | — | 050X070X3 U-CUP BACK-UP |
| 55 | 65 | 3 | — | 055X065X3 U-CUP BACK-UP |
| 55 | 68 | 3 | — | 055X068X3 U-CUP BACK-UP |
| 55 | 70 | 3 | — | 055X070X3 U-CUP BACK-UP |
| 55 | 75 | 3 | — | 055X075X3 U-CUP BACK-UP |
| 60 | 70 | 3 | — | 060X070X3 U-CUP BACK-UP |
| 60 | 73 | 3 | — | 060X073X3 U-CUP BACK-UP |
| 60 | 75 | 3 | — | 060X075X3 U-CUP BACK-UP |
| 60 | 80 | 3 | — | 060X080X3 U-CUP BACK-UP |
| 64 | 80 | 3 | — | 064X080X3 U-CUP BACK-UP |
| 65 | 75 | 3 | — | 065X075X3 U-CUP BACK-UP |
| 65 | 78 | 3 | — | 065X078X3 U-CUP BACK-UP |
| 65 | 80 | 3 | — | 065X080X3 U-CUP BACK-UP |
| 65 | 85 | 3 | — | 065X085X3 U-CUP BACK-UP |
| 70 | 90 | 2 | — | 070X090X2 U-CUP BACK-UP |
| 70 | 80 | 3 | — | 070X080X3 U-CUP BACK-UP |
| 70 | 83 | 3 | — | 070X083X3 U-CUP BACK-UP |
| 70 | 85 | 3 | — | 070X085X3 U-CUP BACK-UP |
| 70 | 90 | 3 | — | 070X090X3 U-CUP BACK-UP |
| 75 | 85 | 3 | — | 075X085X3 U-CUP BACK-UP |
| 75 | 88 | 3 | — | 075X088X3 U-CUP BACK-UP |
| 75 | 90 | 3 | — | 075X090X3 U-CUP BACK-UP |
| 75 | 95 | 3 | — | 075X095X3 U-CUP BACK-UP |
| 80 | 90 | 3 | — | 080X090X3 U-CUP BACK-UP |
| 80 | 93 | 3 | — | 080X093X3 U-CUP BACK-UP |
| 80 | 95 | 3 | — | 080X095X3 U-CUP BACK-UP |
| 80 | 100 | 3 | — | 080X100X3 U-CUP BACK-UP |
| 85 | 100 | 3 | — | 085X100X3 U-CUP BACK-UP |
| 85 | 105 | 3 | — | 085X105X3 U-CUP BACK-UP |
| 90 | 105 | 3 | — | 090X105X3 U-CUP BACK-UP |
| 90 | 110 | 3 | — | 090X110X3 U-CUP BACK-UP |
| 95 | 105 | 3 | — | 095X105X3 U-CUP BACK-UP |
| 95 | 110 | 3 | — | 095X110X3 U-CUP BACK-UP |
| 95 | 115 | 3 | — | 095X115X3 U-CUP BACK-UP |
| 100 | 115 | 3 | — | 100X115X3 U-CUP BACK-UP |
| 100 | 120 | 3 | — | 100X120X3 U-CUP BACK-UP |
| 105 | 120 | 3 | — | 105X120X3 U-CUP BACK-UP |
| 105 | 125 | 3 | — | 105X125X3 U-CUP BACK-UP |
| 110 | 120 | 3 | — | 110X120X3 U-CUP BACK-UP |
| 110 | 125 | 3 | — | 110X125X3 U-CUP BACK-UP |
| 110 | 130 | 3 | — | 110X130X3 U-CUP BACK-UP |
| 115 | 130 | 3 | — | 115X130X3 U-CUP BACK-UP |
| 115 | 135 | 3 | — | 115X135X3 U-CUP BACK-UP |
| 120 | 135 | 3 | — | 120X135X3 U-CUP BACK-UP |
| 120 | 140 | 3 | — | 120X140X3 U-CUP BACK-UP |
| 125 | 140 | 3 | — | 125X140X3 U-CUP BACK-UP |
| 125 | 145 | 3 | — | 125X145X3 U-CUP BACK-UP |
| 130 | 145 | 3 | — | 130X145X3 U-CUP BACK-UP |
| 130 | 150 | 3 | — | 130X150X3 U-CUP BACK-UP |
| 140 | 155 | 3 | — | 140X155X3 U-CUP BACK-UP |
| 140 | 160 | 3 | — | 140X160X3 U-CUP BACK-UP |
| 145 | 160 | 3 | — | 145X160X3 U-CUP BACK-UP |
| 150 | 165 | 3 | — | 150X165X3 U-CUP BACK-UP |
| 150 | 170 | 3 | — | 150X170X3 U-CUP BACK-UP |
| 160 | 180 | 3 | — | 160X180X3 U-CUP BACK-UP |
What does a back-up ring do?
As pressure rises, the elastomer cross-section starts to flow (extrude) into the clearance gap. A back-up ring closes this gap, prevents extrusion and allows the sealing element to work at high pressure. It is usually fitted on the unpressurised side of the seal.
Send us your size
We can also supply sizes that are not on the list. Just send us the part's dimensions and operating conditions. See the group list for all product groups and the product catalogue for products with technical drawings.