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FKM90 Back-up rings
- Category： Back-up rings
- Temperature: -20 - +200℃
- Material: FKM90
- Color: black
- Hardness: 90 shore A
- Product description：In a sealing application, back-up rings provide added extrusion resistance and prevent damage to o-rings and seals when subjected to high pressures, larger extrusion gaps, and/or high temperatures.
1. Description
Back-up Rings are installed together with O-Rings and X-Rings to prevent gap extrusion in applications above 5 MPa. Available in spiral, cut or uncut designs in filled or unfilled PTFE, elastomers and thermoplastics based on ISO 3601, AS 568. A back-up ring is designed to fit between the o-ring and the extrusion gap and prevent the extrusion of the o-ring. Depending upon the direction of pressure in the sealing application, you can either use one backup ring or two backup rings. If unsure, it is always best to use two backup rings per one o-ring.
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 |
4. Back-Up Ring Standard Size
Back-Up Ring SIZE
MEASUREMENTS IN MILLIMETERS
ID
NBR ±
FKM ±
W
±
T
±
A
±
R
±
R0004
2.44
0.13
+0.13/-0.13
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0005
3.23
0.13
+0.13/-0.14
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0006
3.56
0.13
+0.13/-0.14
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0007
4.34
0.13
+0.13/-0.14
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0008
5.13
0.13
+0.13/-0.14
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0009
5.94
0.13
+0.13/-0.14
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0010
6.73
0.13
+0.13/-0.15
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0011
8.31
0.13
+0.13/-0.15
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0012
9.91
0.13
+0.13/-0.16
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0013
11.56
0.13
+0.13/-0.16
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
R0014
13.16
0.13
+0.13/-0.17
1.35
0.08
1.2
0.08
1.14
0.08
2.21
0.25
About more sizes, you can check the attachment or contact us.
sales@foreverseals.com
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