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BUN
Design
    • Contoured back-up rings provide a comfortable fit when paired with an oring.
    • Provides good extrusion resistance to a paired oring to increase pressure handling capabilities.
Material
    • 70A Nitrile - Precision Moulded
    • Most economical solution to enhance oring capability.
Application
    • Suitable for static and dynamic applications.
Fluids
    • Hydraulic fluids, petroleum fuels and oils

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Product Code
Description
Availability
Qty
BUN-431
Backup Contoured NBR90 BS431 - 5.250 X 5.750 X 0.096"
0
BUN-431 - Backup Contoured NBR90 BS431 - 5.250 X 5.750 X 0.096"
Product Information
Product CodeBUN-431
DescriptionBackup Contoured NBR90 BS431 - 5.250 X 5.750 X 0.096"
ProfileBUN
Internal Diameter5.250
Outer Diameter5.750
Seal Height0.096
Max. Temp C110
Alt. Part No.R80431
BUN-253
Backup Contoured NBR90 BS253 - 5.375 X 5.625 X 0.040"
415
BUN-253 - Backup Contoured NBR90 BS253 - 5.375 X 5.625 X 0.040"
Product Information
Product CodeBUN-253
DescriptionBackup Contoured NBR90 BS253 - 5.375 X 5.625 X 0.040"
ProfileBUN
Internal Diameter5.375
Outer Diameter5.625
Seal Height0.040
Max. Temp C110
Alt. Part No.R80253
BUN-356
Backup Contoured NBR90 BS356 - 5.375 X 5.750 X 0.060" 67059185 75172204 137.23 X 146.53 X 1.80mm N8-
53
BUN-356 - Backup Contoured NBR90 BS356 - 5.375 X 5.750 X 0.060" 67059185 75172204 137.23 X 146.53 X 1.80mm N8-
Product Information
Product CodeBUN-356
DescriptionBackup Contoured NBR90 BS356 - 5.375 X 5.750 X 0.060" 67059185 75172204 137.23 X 146.53 X 1.80mm N8-
ProfileBUN
Internal Diameter5.375
Outer Diameter5.750
Seal Height0.060
Max. Temp C110
Alt. Part No.R80356
BUN-432
Backup Contoured NBR90 BS432 - 5.375 X 5.875 X 0.096"
16
BUN-432 - Backup Contoured NBR90 BS432 - 5.375 X 5.875 X 0.096"
Product Information
Product CodeBUN-432
DescriptionBackup Contoured NBR90 BS432 - 5.375 X 5.875 X 0.096"
ProfileBUN
Internal Diameter5.375
Outer Diameter5.875
Seal Height0.096
Max. Temp C110
Alt. Part No.R80432
BUN-161
Backup Contoured NBR90 BS161 - 5.500 X 5.688 X 0.045"
0
BUN-161 - Backup Contoured NBR90 BS161 - 5.500 X 5.688 X 0.045"
Product Information
Product CodeBUN-161
DescriptionBackup Contoured NBR90 BS161 - 5.500 X 5.688 X 0.045"
ProfileBUN
Internal Diameter5.500
Outer Diameter5.688
Seal Height0.045
Max. Temp C110
Alt. Part No.R80161
BUN-254
Backup Contoured NBR90 BS254 - 5.500 X 5.750 X 0.040" 75172072 67059107 140.15 X 146.15 X 1.20mm
61
BUN-254 - Backup Contoured NBR90 BS254 - 5.500 X 5.750 X 0.040" 75172072 67059107 140.15 X 146.15 X 1.20mm
Product Information
Product CodeBUN-254
DescriptionBackup Contoured NBR90 BS254 - 5.500 X 5.750 X 0.040" 75172072 67059107 140.15 X 146.15 X 1.20mm
ProfileBUN
Internal Diameter5.500
Outer Diameter5.750
Seal Height0.040
Max. Temp C110
Alt. Part No.R80254
BUN-357
Backup Contoured NBR90 BS357 - 5.500 X 5.875 X 0.060"
237
BUN-357 - Backup Contoured NBR90 BS357 - 5.500 X 5.875 X 0.060"
Product Information
Product CodeBUN-357
DescriptionBackup Contoured NBR90 BS357 - 5.500 X 5.875 X 0.060"
ProfileBUN
Internal Diameter5.500
Outer Diameter5.875
Seal Height0.060
Max. Temp C110
Alt. Part No.R80357
BUN-433
Backup Contoured NBR90 BS433 - 5.500 X 6.000 X 0.096" 75172277 140.99 X 152.98 X 2.9mm N8-90-433 OL
52
BUN-433 - Backup Contoured NBR90 BS433 - 5.500 X 6.000 X 0.096" 75172277 140.99 X 152.98 X 2.9mm N8-90-433 OL
Product Information
Product CodeBUN-433
DescriptionBackup Contoured NBR90 BS433 - 5.500 X 6.000 X 0.096" 75172277 140.99 X 152.98 X 2.9mm N8-90-433 OL
ProfileBUN
Internal Diameter5.500
Outer Diameter6.000
Seal Height0.096
Max. Temp C110
Alt. Part No.R80433
BUN-255
Backup Contoured NBR90 BS255 - 5.625 X 5.875 X 0.040"
15
BUN-255 - Backup Contoured NBR90 BS255 - 5.625 X 5.875 X 0.040"
Product Information
Product CodeBUN-255
DescriptionBackup Contoured NBR90 BS255 - 5.625 X 5.875 X 0.040"
ProfileBUN
Internal Diameter5.625
Outer Diameter5.875
Seal Height0.040
Max. Temp C110
Alt. Part No.R80255
BUN-358
Backup Contoured NBR90 BS358 - 5.625 X 6.000 X 0.060" 142.88 x 152.40 x 1.52mm 75172207 67059187
43
BUN-358 - Backup Contoured NBR90 BS358 - 5.625 X 6.000 X 0.060" 142.88 x 152.40 x 1.52mm 75172207 67059187
Product Information
Product CodeBUN-358
DescriptionBackup Contoured NBR90 BS358 - 5.625 X 6.000 X 0.060" 142.88 x 152.40 x 1.52mm 75172207 67059187
ProfileBUN
Internal Diameter5.625
Outer Diameter6.000
Seal Height0.060
Max. Temp C110
Alt. Part No.R80358
BUN-434
Backup Contoured NBR90 BS434 - 5.625 X 6.125 X 0.096"
0
BUN-434 - Backup Contoured NBR90 BS434 - 5.625 X 6.125 X 0.096"
Product Information
Product CodeBUN-434
DescriptionBackup Contoured NBR90 BS434 - 5.625 X 6.125 X 0.096"
ProfileBUN
Internal Diameter5.625
Outer Diameter6.125
Seal Height0.096
Max. Temp C110
Alt. Part No.R80434
BUN-162
Backup Contoured NBR90 BS162 - 5.750 X 5.938 X 0.045"
920
BUN-162 - Backup Contoured NBR90 BS162 - 5.750 X 5.938 X 0.045"
Product Information
Product CodeBUN-162
DescriptionBackup Contoured NBR90 BS162 - 5.750 X 5.938 X 0.045"
ProfileBUN
Internal Diameter5.750
Outer Diameter5.938
Seal Height0.045
Max. Temp C110
Alt. Part No.R80162
BUN-256
Backup Contoured NBR90 BS256 - 5.750 X 6.000 X 0.040"
273
BUN-256 - Backup Contoured NBR90 BS256 - 5.750 X 6.000 X 0.040"
Product Information
Product CodeBUN-256
DescriptionBackup Contoured NBR90 BS256 - 5.750 X 6.000 X 0.040"
ProfileBUN
Internal Diameter5.750
Outer Diameter6.000
Seal Height0.040
Max. Temp C110
Alt. Part No.R80256
BUN-359
Backup Contoured NBR90 BS359 - 5.750 X 6.125 X 0.060"
0
BUN-359 - Backup Contoured NBR90 BS359 - 5.750 X 6.125 X 0.060"
Product Information
Product CodeBUN-359
DescriptionBackup Contoured NBR90 BS359 - 5.750 X 6.125 X 0.060"
ProfileBUN
Internal Diameter5.750
Outer Diameter6.125
Seal Height0.060
Max. Temp C110
Alt. Part No.R80359
BUN-435
Backup Contoured NBR90 BS435 - 5.750 X 6.250 X 0.096"
142
BUN-435 - Backup Contoured NBR90 BS435 - 5.750 X 6.250 X 0.096"
Product Information
Product CodeBUN-435
DescriptionBackup Contoured NBR90 BS435 - 5.750 X 6.250 X 0.096"
ProfileBUN
Internal Diameter5.750
Outer Diameter6.250
Seal Height0.096
Max. Temp C110
Alt. Part No.R80435
BUN-257
Backup Contoured NBR90 BS257 - 5.875 X 6.125 X 0.040"
23
BUN-257 - Backup Contoured NBR90 BS257 - 5.875 X 6.125 X 0.040"
Product Information
Product CodeBUN-257
DescriptionBackup Contoured NBR90 BS257 - 5.875 X 6.125 X 0.040"
ProfileBUN
Internal Diameter5.875
Outer Diameter6.125
Seal Height0.040
Max. Temp C110
Alt. Part No.R80257
BUN-360
Backup Contoured NBR90 BS360 - 5.875 X 6.250 X 0.060" 149.93 X 159.23 X 1.80mm 75172210 67059189 N8-
7
BUN-360 - Backup Contoured NBR90 BS360 - 5.875 X 6.250 X 0.060" 149.93 X 159.23 X 1.80mm 75172210 67059189 N8-
Product Information
Product CodeBUN-360
DescriptionBackup Contoured NBR90 BS360 - 5.875 X 6.250 X 0.060" 149.93 X 159.23 X 1.80mm 75172210 67059189 N8-
ProfileBUN
Internal Diameter5.875
Outer Diameter6.250
Seal Height0.060
Max. Temp C110
Alt. Part No.R80360
BUN-436
Backup Contoured NBR90 BS436 - 5.875 X 6.375 X 0.096"
81
BUN-436 - Backup Contoured NBR90 BS436 - 5.875 X 6.375 X 0.096"
Product Information
Product CodeBUN-436
DescriptionBackup Contoured NBR90 BS436 - 5.875 X 6.375 X 0.096"
ProfileBUN
Internal Diameter5.875
Outer Diameter6.375
Seal Height0.096
Max. Temp C110
Alt. Part No.R80436
BUN-163
Backup Contoured NBR90 BS163 - 6.000 X 6.188 X 0.045"
0
BUN-163 - Backup Contoured NBR90 BS163 - 6.000 X 6.188 X 0.045"
Product Information
Product CodeBUN-163
DescriptionBackup Contoured NBR90 BS163 - 6.000 X 6.188 X 0.045"
ProfileBUN
Internal Diameter6.000
Outer Diameter6.188
Seal Height0.045
Max. Temp C110
Alt. Part No.R80163
BUN-258
Backup Contoured NBR90 BS258 - 6.000 X 6.250 X 0.040"
75
BUN-258 - Backup Contoured NBR90 BS258 - 6.000 X 6.250 X 0.040"
Product Information
Product CodeBUN-258
DescriptionBackup Contoured NBR90 BS258 - 6.000 X 6.250 X 0.040"
ProfileBUN
Internal Diameter6.000
Outer Diameter6.250
Seal Height0.040
Max. Temp C110
Alt. Part No.R80258
BUN-361
Backup Contoured NBR90 BS361 - 6.000 X 6.375 X 0.060"
135
BUN-361 - Backup Contoured NBR90 BS361 - 6.000 X 6.375 X 0.060"
Product Information
Product CodeBUN-361
DescriptionBackup Contoured NBR90 BS361 - 6.000 X 6.375 X 0.060"
ProfileBUN
Internal Diameter6.000
Outer Diameter6.375
Seal Height0.060
Max. Temp C110
Alt. Part No.R80361
BUN-437
Backup Contoured NBR90 BS437 - 6.000 X 6.500 X 0.096"
20
BUN-437 - Backup Contoured NBR90 BS437 - 6.000 X 6.500 X 0.096"
Product Information
Product CodeBUN-437
DescriptionBackup Contoured NBR90 BS437 - 6.000 X 6.500 X 0.096"
ProfileBUN
Internal Diameter6.000
Outer Diameter6.500
Seal Height0.096
Max. Temp C110
Alt. Part No.R80437
BUN-164
Backup Contoured NBR90 BS164 - 6.250 X 6.438 X 0.045" 67059039 75171923 159.20 x 1.14mm N8-90-164 OL
1,016
BUN-164 - Backup Contoured NBR90 BS164 - 6.250 X 6.438 X 0.045" 67059039 75171923 159.20 x 1.14mm N8-90-164 OL
Product Information
Product CodeBUN-164
DescriptionBackup Contoured NBR90 BS164 - 6.250 X 6.438 X 0.045" 67059039 75171923 159.20 x 1.14mm N8-90-164 OL
ProfileBUN
Internal Diameter6.250
Outer Diameter6.438
Seal Height0.045
Max. Temp C110
Alt. Part No.R80164
BUN-259
Backup Contoured NBR90 BS259 - 6.250 X 6.500 X 0.040" 67059112 75172080 N8-90-259 OLD CODE 159.21 x
102
BUN-259 - Backup Contoured NBR90 BS259 - 6.250 X 6.500 X 0.040" 67059112 75172080 N8-90-259 OLD CODE 159.21 x
Product Information
Product CodeBUN-259
DescriptionBackup Contoured NBR90 BS259 - 6.250 X 6.500 X 0.040" 67059112 75172080 N8-90-259 OLD CODE 159.21 x
ProfileBUN
Internal Diameter6.250
Outer Diameter6.500
Seal Height0.040
Max. Temp C110
Alt. Part No.R80259
 
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