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#:
8-357 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:
45.00
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:
220.00
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:
169.00
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:
20.00
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:
16.00
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:
0.00
ETA:
02/10/2025
Your Price:
6.44
Each
Item#:
8-363 N90

ID-6.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-6.5 CS-3/16
SPEC SHEET

Available:
90.00
Your Price:
6.83
Each
Item#:
8-364 N90

ID-6.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-6.75 CS-3/16
SPEC SHEET

Available:
67.00
Your Price:
6.91
Each
Item#:
8-365 N90

ID-7 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-7 CS-3/16
SPEC SHEET

Available:
36.00
Your Price:
7.39
Each
Item#:
8-366 N90

ID-7.25 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-7.25 CS-3/16
SPEC SHEET

Available:
43.00
Your Price:
7.39
Each
Item#:
8-367 N90

ID-7.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-7.5 CS-3/16
SPEC SHEET

Available:
97.00
Your Price:
7.47
Each
Item#:
8-368 N90

ID-7.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-7.75 CS-3/16
SPEC SHEET

Available:
47.00
Your Price:
7.47
Each
Item#:
8-369 N90

ID-8 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-8 CS-3/16
SPEC SHEET

Available:
16.00
Your Price:
7.82
Each
Item#:
8-370 N90

ID-8.25 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-8.25 CS-3/16
SPEC SHEET

Available:
31.00
Your Price:
7.87
Each
Item#:
8-371 N90

ID-8.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-8.5 CS-3/16
SPEC SHEET

Available:
8.00
Your Price:
7.90
Each
Item#:
8-372 N90

ID-8.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-8.75 CS-3/16
SPEC SHEET

Available:
19.00
Your Price:
8.10
Each
Item#:
8-373 N90

ID-9 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-9 CS-3/16
SPEC SHEET

Available:
20.00
Your Price:
8.10
Each
Item#:
8-374 N90

ID-9.25 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-9.25 CS-3/16
SPEC SHEET

Available:
69.00
Your Price:
9.46
Each
Item#:
8-375 N90

ID-9.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-9.5 CS-3/16
SPEC SHEET

Available:
4.00
Your Price:
9.85
Each
Item#:
8-376 N90

ID-9.75 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-9.75 CS-3/16
SPEC SHEET

Available:
6.00
Your Price:
10.46
Each
Item#:
8-377 N90

ID-10 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-10 CS-3/16
SPEC SHEET

Available:
13.00
Your Price:
10.40
Each
Item#:
8-378 N90

ID-10.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-10.5 CS-3/16
SPEC SHEET

Available:
55.00
Your Price:
10.40
Each
Item#:
8-379 N90

ID-11 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-11 CS-3/16
SPEC SHEET

Available:
30.00
Your Price:
10.40
Each
Item#:
8-380 N90

ID-11.5 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-11.5 CS-3/16
SPEC SHEET

Available:
7.00
Your Price:
10.40
Each
Item#:
8-381 N90

ID-12 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-12 CS-3/16
SPEC SHEET

Available:
27.00
Your Price:
10.40
Each
Item#:
8-382 N90

ID-13 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-13 CS-3/16
SPEC SHEET

Available:
54.00
Your Price:
10.56
Each
Item#:
8-383 N90

ID-14 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-14 CS-3/16
SPEC SHEET

Available:
10.00
Your Price:
10.56
Each
Item#:
8-384 N90

ID-15 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-15 CS-3/16
SPEC SHEET

Available:
6.00
Your Price:
10.56
Each
Item#:
8-385 N90

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

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

ID-16 CS-3/16
SPEC SHEET

Available:
3.00
Your Price:
16.75
Each
Item#:
8-386 N90

ID-17 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-17 CS-3/16
SPEC SHEET

Available:
8.00
Your Price:
18.07
Each
Item#:
8-387 N90

ID-18 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-18 CS-3/16
SPEC SHEET

Available:
9.00
Your Price:
18.45
Each
Item#:
8-388 N90

ID-19 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-19 CS-3/16
SPEC SHEET

Available:
4.00
Your Price:
20.03
Each
Item#:
8-389 N90

ID-20 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-20 CS-3/16
SPEC SHEET

Available:
10.00
Your Price:
21.71
Each
Item#:
8-390 N90

ID-21 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-21 CS-3/16
SPEC SHEET

Available:
17.00
Your Price:
25.08
Each
Item#:
8-391 N90

ID-22 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-22 CS-3/16
SPEC SHEET

Available:
6.00
Your Price:
26.02
Each
Item#:
8-392 N90

ID-23 Nominal CS-3/16" 90D NBR Contoured Back Up Inch

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

ID-23 CS-3/16
SPEC SHEET

Available:
4.00
Your Price:
33.12
Each
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