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
Name: Kevin Li
Mobile：+86-13049188460
Tel：+86-13049188460
Whatsapp：+86-18098184099
Email：sales@foreverseals.com
Add：F4C17, Building 3, Huiquan science park, Taoyuan East Road, Shishan Town, Nanhai District, Foshan city, Guangdong Province, P.R. China 528225
