A back-up ring is a rigid ring that holds an elastomeric seal or plastic (such as Polyethylene) connection to its designed shape and in its correct place. Back up rings are commonly used with O-rings and lip seals.

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Item#:
8-327 N90

ID-1.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-1.75 CS-3/16
SPEC SHEET

Available:
252.00
Your Price:
1.22
Each
Item#:
8-328 N90

ID-1.875 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-1.875 CS-3/16
SPEC SHEET

Available:
72.00
Your Price:
1.30
Each
Item#:
8-329 N90

ID-2 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-2 CS-3/16
SPEC SHEET

Available:
166.00
Your Price:
1.47
Each
Item#:
8-330 N90

ID-2.125 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-2.125 CS-3/16
SPEC SHEET

Available:
1153.00
Your Price:
1.56
Each
Item#:
8-331 N90

ID-2.25 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-2.25 CS-3/16
SPEC SHEET

Available:
126.00
Your Price:
1.58
Each
Item#:
8-332 N90

ID-2.375 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-2.375 CS-3/16
SPEC SHEET

Available:
272.00
Your Price:
1.66
Each
Item#:
8-333 N90

ID-2.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-2.5 CS-3/16
SPEC SHEET

Available:
75.00
Your Price:
1.71
Each
Item#:
8-334 N90

ID-2.625 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-2.625 CS-3/16
SPEC SHEET

Available:
433.00
Your Price:
1.75
Each
Item#:
8-335 N90

ID-2.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-2.75 CS-3/16
SPEC SHEET

Available:
101.00
Your Price:
1.93
Each
Item#:
8-336 N90

ID-2.875 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-2.875 CS-3/16
SPEC SHEET

Available:
89.00
Your Price:
1.94
Each
Item#:
8-337 N90

ID-3 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-3 CS-3/16
SPEC SHEET

Available:
426.00
Your Price:
1.96
Each
Item#:
8-338 N90

ID-3.125 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-3.125 CS-3/16
SPEC SHEET

Available:
858.00
Your Price:
1.98
Each
Item#:
8-339 N90

ID-3.25 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-3.25 CS-3/16
SPEC SHEET

Available:
53.00
Your Price:
2.17
Each
Item#:
8-340 N90

ID-3.375 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-3.375 CS-3/16
SPEC SHEET

Available:
223.00
Your Price:
2.34
Each
Item#:
8-341 N90

ID-3.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-3.5 CS-3/16
SPEC SHEET

Available:
310.00
Your Price:
2.32
Each
Item#:
8-342 N90

ID-3.625 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-3.625 CS-3/16
SPEC SHEET

Available:
673.00
Your Price:
2.44
Each
Item#:
8-343 N90

ID-3.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-3.75 CS-3/16
SPEC SHEET

Available:
96.00
Your Price:
2.72
Each
Item#:
8-344 N90

ID-3.875 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-3.875 CS-3/16
SPEC SHEET

Available:
0.00
ETA:
11/14/2025
Your Price:
2.97
Each
Item#:
8-345 N90

ID-4 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-4 CS-3/16
SPEC SHEET

Available:
71.00
Your Price:
3.09
Each
Item#:
8-346 N90

ID-4.125 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-4.125 CS-3/16
SPEC SHEET

Available:
428.00
Your Price:
3.21
Each
Item#:
8-347 N90

ID-4.25 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-4.25 CS-3/16
SPEC SHEET

Available:
19.00
Your Price:
3.24
Each
Item#:
8-348 N90

ID-4.375 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-4.375 CS-3/16
SPEC SHEET

Available:
26.00
Your Price:
3.41
Each
Item#:
8-349 N90

ID-4.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-4.5 CS-3/16
SPEC SHEET

Available:
132.00
Your Price:
3.42
Each
Item#:
8-350 N90

ID-4.625 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-4.625 CS-3/16
SPEC SHEET

Available:
327.00
Your Price:
3.67
Each
Item#:
8-351 N90

ID-4.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-4.75 CS-3/16
SPEC SHEET

Available:
44.00
Your Price:
3.84
Each
Item#:
8-352 N90

ID-4.875 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-4.875 CS-3/16
SPEC SHEET

Available:
24.00
Your Price:
3.86
Each
Item#:
8-353 N90

ID-5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-5 CS-3/16
SPEC SHEET

Available:
54.00
Your Price:
3.99
Each
Item#:
8-354 N90

ID-5.125 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-5.125 CS-3/16
SPEC SHEET

Available:
38.00
Your Price:
4.45
Each
Item#:
8-355 N90

ID-5.25 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-5.25 CS-3/16
SPEC SHEET

Available:
23.00
Your Price:
4.70
Each
Item#:
8-356 N90

ID-5.375 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-5.375 CS-3/16
SPEC SHEET

Available:
25.00
Your Price:
4.84
Each
Item#:
8-357 N90

ID-5.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-5.5 CS-3/16
SPEC SHEET

Available:
47.00
Your Price:
5.13
Each
Item#:
8-358 N90

ID-5.625 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-5.625 CS-3/16
SPEC SHEET

Available:
209.00
Your Price:
5.38
Each
Item#:
8-359 N90

ID-5.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-5.75 CS-3/16
SPEC SHEET

Available:
160.00
Your Price:
5.41
Each
Item#:
8-360 N90

ID-5.875 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-5.875 CS-3/16
SPEC SHEET

Available:
48.00
Your Price:
5.58
Each
Item#:
8-361 N90

ID-6 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-6 CS-3/16
SPEC SHEET

Available:
49.00
Your Price:
5.63
Each
Item#:
8-362 N90

ID-6.25 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

Hydraulic SealAlternative Seals: 19-, 51-, MS28774, MS27595, MS28782, MS28783

ID-6.25 CS-3/16
SPEC SHEET

Available:
16.00
Your Price:
6.44
Each
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