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, lip seals, and as reciprocating shaft seals

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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:
517.00
Your Price:
1.35
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:
332.00
Your Price:
1.52
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:
723.00
Your Price:
1.61
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:
457.00
Your Price:
1.63
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:
967.00
Your Price:
1.71
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:
115.00
Your Price:
1.77
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:
1141.00
Your Price:
1.80
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:
47.00
Your Price:
1.99
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:
486.00
Your Price:
2.00
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:
157.00
Your Price:
2.02
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:
534.00
Your Price:
2.04
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:
139.00
Your Price:
2.25
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:
486.00
Your Price:
2.43
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:
309.00
Your Price:
2.39
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:
975.00
Your Price:
2.52
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:
107.00
Your Price:
2.81
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:
114.00
Your Price:
3.07
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:
421.00
Your Price:
3.19
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:
343.00
Your Price:
3.32
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:
53.00
Your Price:
3.33
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:
80.00
Your Price:
3.51
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:
501.00
Your Price:
3.53
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:
320.00
Your Price:
3.78
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:
7.00
Your Price:
3.96
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:
70.00
Your Price:
3.97
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:
45.00
Your Price:
4.12
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:
90.00
Your Price:
4.59
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:
33.00
Your Price:
4.85
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:
77.00
Your Price:
4.98
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:
146.00
Your Price:
5.30
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:
208.00
Your Price:
5.55
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:
129.00
Your Price:
5.58
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:
5.75
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:
17.00
Your Price:
5.81
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:
105.00
Your Price:
6.64
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:
45.00
Your Price:
7.03
Each
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