Backup O-Rings
High pressure trying to blow your O-ring into the clearance gap? Backup O-rings (backup washers) give your seal a hard shoulder so it stays put in hydraulic cylinders and valves. Our Buna-N 90 options come in 3/32", 1/8" or 3/16" wall. Match wall thickness to your extrusion gap and pressure.
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Backup Buna-N 90 O-Rings w/ 3/32" Wall
Backup Buna-N 90 o-ring backup washers made of nitrile with a 90 durometer and 3/32" wall thickness provide supplemental support to o-ring seals in high-pressure hydraulic and valve applications. They help prevent o-ring extrusion under heavy stress and resist temperatures from -65 °F to 300 °F.
| Item # | Industry Number | Inside Diameter | Outside Diameter | Material | Durometer | Package Qty | |||
|---|---|---|---|---|---|---|---|---|---|
|
|
511710
|
110
|
3/8"
|
9/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511711
|
111
|
7/16"
|
5/8"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511712
|
112
|
1/2"
|
11/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511713
|
113
|
9/16"
|
3/4"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511714
|
114
|
5/8"
|
13/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511715
|
115
|
11/16"
|
7/8"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511716
|
116
|
3/4"
|
15/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511717
|
117
|
13/16"
|
1"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511718
|
118
|
7/8"
|
1-1/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511719
|
119
|
15/16"
|
1-1/8"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511720
|
120
|
1"
|
1-3/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511721
|
121
|
1-1/16"
|
1-1/4"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511722
|
122
|
1-1/8"
|
1-5/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511723
|
123
|
1-3/16"
|
1-3/8"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511724
|
124
|
1-1/4"
|
1-7/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511725
|
125
|
1-5/16"
|
1-1/2"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511726
|
126
|
1-3/8"
|
1-9/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511727
|
127
|
1-7/16"
|
1-5/8"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511728
|
128
|
1-1/2"
|
1-11/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511729
|
129
|
1-9/16"
|
1-3/4"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511730
|
130
|
1-5/8"
|
1-13/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511732
|
132
|
1-3/4"
|
1-15/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511734
|
134
|
1-7/8"
|
2-1/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511736
|
136
|
2"
|
2-3/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511738
|
138
|
2-1/8"
|
2-5/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511740
|
140
|
2-1/4"
|
2-7/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511742
|
142
|
2-3/8"
|
2-9/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511744
|
144
|
2-1/2"
|
2-11/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511746
|
146
|
2-5/8"
|
2-13/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511748
|
148
|
2-3/4"
|
2-15/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511750
|
150
|
2-7/8"
|
3-1/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511751
|
151
|
3"
|
3-3/16"
|
Nitrile
|
90
|
10
|
Log in to view price |
Backup Buna-N 90 O-Rings w/ 1/8" Wall
Backup Buna-N 90 o-ring backup washers made of nitrile with a 90 durometer and 1/8" wall thickness. Designed to support o-ring seals in high-pressure hydraulic and valve applications and help prevent o-ring extrusion. Temperature range -65 °F to 300 °F.
| Item # | Industry Number | Inside Diameter | Outside Diameter | Material | Durometer | Package Qty | |||
|---|---|---|---|---|---|---|---|---|---|
|
|
511810
|
210
|
3/4"
|
1"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511811
|
211
|
13/16"
|
1-1/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511812
|
212
|
7/8"
|
1-1/8"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511813
|
213
|
15/16"
|
1-3/16"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511814
|
214
|
1"
|
1-1/4"
|
Nitrile
|
90
|
20
|
Log in to view price | |
|
|
511815
|
215
|
1-1/16"
|
1-5/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511816
|
216
|
1-1/8"
|
1-3/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511817
|
217
|
1-3/16"
|
1-7/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511818
|
218
|
1-1/4"
|
1-1/2"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511819
|
219
|
1-5/16"
|
1-9/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511820
|
220
|
1-3/8"
|
1-5/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511822
|
222
|
1-7/16"
|
1-11/16"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511823
|
223
|
1-1/2"
|
1-3/4"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511824
|
224
|
1-5/8"
|
1-7/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511825
|
225
|
1-3/4"
|
2"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511826
|
226
|
1-7/8"
|
2-1/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511827
|
227
|
2"
|
2-1/4"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511828
|
228
|
2-1/8"
|
2-3/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511829
|
229
|
2-1/4"
|
2-1/2"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511830
|
230
|
2-3/8"
|
2-5/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511831
|
231
|
2-1/2"
|
2-3/4"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511832
|
232
|
2-5/8"
|
2-7/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511833
|
233
|
2-3/4"
|
3"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511834
|
234
|
2-7/8"
|
3-1/8"
|
Nitrile
|
90
|
10
|
Log in to view price |
Backup Buna-N 90 O-Rings w/ 3/16" Wall
Backup Buna-N 90 o-ring backup washers made from nitrile with a 90 durometer and 3/16" wall thickness. Designed to prevent o-ring extrusion and provide supplemental support in high-pressure hydraulic and valve applications. Not for use without o-rings.
| Item # | Industry Number | Inside Diameter | Outside Diameter | Material | Durometer | Package Qty | |||
|---|---|---|---|---|---|---|---|---|---|
|
|
511925
|
325
|
1-1/2"
|
1-7/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511926
|
326
|
1-5/8"
|
2"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511927
|
327
|
1-3/4"
|
2-1/8"
|
Nitrile
|
90
|
10
|
Log in to view price | |
|
|
511928
|
328
|
1-7/8"
|
2-1/4"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511929
|
329
|
2"
|
2-3/8"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511930
|
330
|
2-1/8"
|
2-1/2"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511931
|
331
|
2-1/4"
|
2-5/8"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511932
|
332
|
2-3/8"
|
2-3/4"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511933
|
333
|
2-1/2"
|
2-7/8"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511934
|
334
|
2-5/8"
|
3"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511935
|
335
|
2-3/4"
|
3-1/8"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511936
|
336
|
2-7/8"
|
3-1/4"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511937
|
337
|
3"
|
3-3/8"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511938
|
338
|
3-1/8"
|
3-1/2"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511939
|
339
|
3-1/4"
|
3-5/8"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511940
|
340
|
3-3/8"
|
3-3/4"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511941
|
341
|
3-1/2"
|
3-7/8"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511942
|
342
|
3-5/8"
|
4"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511943
|
343
|
3-3/4"
|
4-1/8"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511944
|
344
|
3-7/8"
|
4-1/4"
|
Nitrile
|
90
|
6
|
Log in to view price | |
|
|
511945
|
345
|
4"
|
4-3/8"
|
Nitrile
|
90
|
6
|
Log in to view price |
32 options | Item #:
511710
Price
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24 options | Item #:
511810
Price
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21 options | Item #:
511925
Price
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