STR 19-337-395ABack-up ring
Back-up rings prevent gap extrusion of O-rings. In static radial sealing, back-up rings can be used to prevent the seal from pressing into the gap when pressure and temperature increase, and prevent extrusion damage and possibly even premature failure.
Ring dimensions
| ID |
75.57 mm
|
O-ring inside diameter |
|---|---|---|
| CS |
5.33 mm
|
O-ring width |
|
337
|
Dash-number | |
| w |
1.7 mm
|
Back-up ring thickness |
Groove width for one back-up ring
| L1 |
8.8 mm
|
Groove width |
|---|---|---|
| tol L1 |
0.2 mm
|
Upper limit deviation |
|
0 mm
|
Lower limit deviation |
Groove width for two back-up rings
| L2 |
10.5 mm
|
Groove width |
|---|---|---|
| tol L2 |
0.2 mm
|
Upper limit deviation |
|
0 mm
|
Lower limit deviation |
Material
| Back-up ring material |
Polyurethane (PU)
|
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