Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
NBR90 Back-up rings
- Category： Back-up rings
- Temperature: -30 - +100℃
- Material: NBR90
- Color: black
- Hardness: 90 shore A
- Product description：Back-Up rings are routinely produced in a 90 durometer Nitrile - Buna-N. This provides sufficient elasticity to permit stretching over the major diameter of a piston and then snapping back into the gl
1. Description
Back-Up rings are routinely produced in a 90 durometer Nitrile - Buna-N. This provides sufficient elasticity to permit stretching over the major diameter of a piston and then snapping back into the gland groove cut into the piston. 90 durometer has sufficient hardness to resist extrusion of the softer elastomeric O-Ring performing the actual sealing function against the high pressure liquid or gas.
2. Sectional Drawing
3. Back-Up Ring Design Reference
|
Size |
Tolerance in mm |
|||||||
|
From |
To |
W. |
TOL.± |
T.(REF.) |
TOL.± |
A. |
TOL.± |
R |
|
-4 |
-50 |
1.35 |
0.08 |
1.2 |
0.08 |
1.14 |
0.08 |
2.21 |
|
-102 |
-178 |
2.18 |
0.08 |
1.28 |
0.08 |
1.14 |
0.08 |
3.28 |
|
-201 |
-284 |
3 |
0.1 |
1.23 |
0.08 |
1.02 |
0.08 |
4.42 |
|
-309 |
-395 |
4.65 |
0.13 |
1.88 |
0.1 |
1.52 |
0.1 |
6.65 |
|
-425 |
-475 |
5.99 |
0.15 |
2.97 |
0.13 |
2.44 |
0.13 |
8.74 |
About the sizes, you can check the attachment or contact us.
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