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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-425
Backup Contoured NBR90 BS425 - 4.500 X 5.000 X 0.096" 114.30 X 127.00 X 2.44MM 75172265 67059225
49
BUN-425 - Backup Contoured NBR90 BS425 - 4.500 X 5.000 X 0.096" 114.30 X 127.00 X 2.44MM 75172265 67059225
Product Information
Product CodeBUN-425
DescriptionBackup Contoured NBR90 BS425 - 4.500 X 5.000 X 0.096" 114.30 X 127.00 X 2.44MM 75172265 67059225
ProfileBUN
Internal Diameter4.500
Outer Diameter5.000
Seal Height0.096
Max. Temp C110
Alt. Part No.R80425
BUN-247
Backup Contoured NBR90 BS247 - 4.625 X 4.875 X 0.040" 67059100 75083816
69
BUN-247 - Backup Contoured NBR90 BS247 - 4.625 X 4.875 X 0.040" 67059100 75083816
Product Information
Product CodeBUN-247
DescriptionBackup Contoured NBR90 BS247 - 4.625 X 4.875 X 0.040" 67059100 75083816
ProfileBUN
Internal Diameter4.625
Outer Diameter4.875
Seal Height0.040
Max. Temp C110
Alt. Part No.R80247
BUN-350
Backup Contoured NBR90 BS350 - 4.625 X 5.000 X 0.060" 75172192 67059179 N8-90-350 OLD CODE 118.18 X
110
BUN-350 - Backup Contoured NBR90 BS350 - 4.625 X 5.000 X 0.060" 75172192 67059179 N8-90-350 OLD CODE 118.18 X
Product Information
Product CodeBUN-350
DescriptionBackup Contoured NBR90 BS350 - 4.625 X 5.000 X 0.060" 75172192 67059179 N8-90-350 OLD CODE 118.18 X
ProfileBUN
Internal Diameter4.625
Outer Diameter5.000
Seal Height0.060
Max. Temp C110
Alt. Part No.R80350
BUN-426
Backup Contoured NBR90 BS426 - 4.625 X 5.125 X 0.096"
0
BUN-426 - Backup Contoured NBR90 BS426 - 4.625 X 5.125 X 0.096"
Product Information
Product CodeBUN-426
DescriptionBackup Contoured NBR90 BS426 - 4.625 X 5.125 X 0.096"
ProfileBUN
Internal Diameter4.625
Outer Diameter5.125
Seal Height0.096
Max. Temp C110
Alt. Part No.R80426
BUN-048
Backup Contoured NBR90 BS048 - 4.750 X 4.875 X 0.045"
0
BUN-048 - Backup Contoured NBR90 BS048 - 4.750 X 4.875 X 0.045"
Product Information
Product CodeBUN-048
DescriptionBackup Contoured NBR90 BS048 - 4.750 X 4.875 X 0.045"
ProfileBUN
Internal Diameter4.750
Outer Diameter4.875
Seal Height0.045
Max. Temp C110
Alt. Part No.R80048
BUN-158
Backup Contoured NBR90 BS158 - 4.750 X 4.938 X 0.045"
0
BUN-158 - Backup Contoured NBR90 BS158 - 4.750 X 4.938 X 0.045"
Product Information
Product CodeBUN-158
DescriptionBackup Contoured NBR90 BS158 - 4.750 X 4.938 X 0.045"
ProfileBUN
Internal Diameter4.750
Outer Diameter4.938
Seal Height0.045
Max. Temp C110
Alt. Part No.R80158
BUN-248
Backup Contoured NBR90 BS248 - 4.750 X 5.000 X 0.040" 67059101 75172059 121.10 X 127.10 X 1.20mm N8-
180
BUN-248 - Backup Contoured NBR90 BS248 - 4.750 X 5.000 X 0.040" 67059101 75172059 121.10 X 127.10 X 1.20mm N8-
Product Information
Product CodeBUN-248
DescriptionBackup Contoured NBR90 BS248 - 4.750 X 5.000 X 0.040" 67059101 75172059 121.10 X 127.10 X 1.20mm N8-
ProfileBUN
Internal Diameter4.750
Outer Diameter5.000
Seal Height0.040
Max. Temp C110
Alt. Part No.R80248
BUN-351
Backup Contoured NBR90 BS351 - 4.750 X 5.125 X 0.060"
174
BUN-351 - Backup Contoured NBR90 BS351 - 4.750 X 5.125 X 0.060"
Product Information
Product CodeBUN-351
DescriptionBackup Contoured NBR90 BS351 - 4.750 X 5.125 X 0.060"
ProfileBUN
Internal Diameter4.750
Outer Diameter5.125
Seal Height0.060
Max. Temp C110
Alt. Part No.R80351
BUN-427
Backup Contoured NBR90 BS427 - 4.750 X 5.250 X 0.096"
0
BUN-427 - Backup Contoured NBR90 BS427 - 4.750 X 5.250 X 0.096"
Product Information
Product CodeBUN-427
DescriptionBackup Contoured NBR90 BS427 - 4.750 X 5.250 X 0.096"
ProfileBUN
Internal Diameter4.750
Outer Diameter5.250
Seal Height0.096
Max. Temp C110
Alt. Part No.R80427
BUN-249
Backup Contoured NBR90 BS249 - 4.875 X 5.125 X 0.040" 75172061 N8-90-249 OLD CODE 124.28 X 130.27 X
70
BUN-249 - Backup Contoured NBR90 BS249 - 4.875 X 5.125 X 0.040" 75172061 N8-90-249 OLD CODE 124.28 X 130.27 X
Product Information
Product CodeBUN-249
DescriptionBackup Contoured NBR90 BS249 - 4.875 X 5.125 X 0.040" 75172061 N8-90-249 OLD CODE 124.28 X 130.27 X
ProfileBUN
Internal Diameter4.875
Outer Diameter5.125
Seal Height0.040
Max. Temp C110
Alt. Part No.R80249
BUN-352
Backup Contoured NBR90 BS352 - 4.875 X 5.250 X 0.060"
0
BUN-352 - Backup Contoured NBR90 BS352 - 4.875 X 5.250 X 0.060"
Product Information
Product CodeBUN-352
DescriptionBackup Contoured NBR90 BS352 - 4.875 X 5.250 X 0.060"
ProfileBUN
Internal Diameter4.875
Outer Diameter5.250
Seal Height0.060
Max. Temp C110
Alt. Part No.R80352
BUN-428
Backup Contoured NBR90 BS428 - 4.875 X 5.375 X 0.096"
0
BUN-428 - Backup Contoured NBR90 BS428 - 4.875 X 5.375 X 0.096"
Product Information
Product CodeBUN-428
DescriptionBackup Contoured NBR90 BS428 - 4.875 X 5.375 X 0.096"
ProfileBUN
Internal Diameter4.875
Outer Diameter5.375
Seal Height0.096
Max. Temp C110
Alt. Part No.R80428
BUN-049
Backup Contoured NBR90 BS049 - 5.000 X 5.125 X 0.045"
0
BUN-049 - Backup Contoured NBR90 BS049 - 5.000 X 5.125 X 0.045"
Product Information
Product CodeBUN-049
DescriptionBackup Contoured NBR90 BS049 - 5.000 X 5.125 X 0.045"
ProfileBUN
Internal Diameter5.000
Outer Diameter5.125
Seal Height0.045
Max. Temp C110
Alt. Part No.R80049
BUN-159
Backup Contoured NBR90 BS159 - 5.000 X 5.188 X 0.045"
0
BUN-159 - Backup Contoured NBR90 BS159 - 5.000 X 5.188 X 0.045"
Product Information
Product CodeBUN-159
DescriptionBackup Contoured NBR90 BS159 - 5.000 X 5.188 X 0.045"
ProfileBUN
Internal Diameter5.000
Outer Diameter5.188
Seal Height0.045
Max. Temp C110
Alt. Part No.R80159
BUN-250
Backup Contoured NBR90 BS250 - 5.000 X 5.250 X 0.040"
127
BUN-250 - Backup Contoured NBR90 BS250 - 5.000 X 5.250 X 0.040"
Product Information
Product CodeBUN-250
DescriptionBackup Contoured NBR90 BS250 - 5.000 X 5.250 X 0.040"
ProfileBUN
Internal Diameter5.000
Outer Diameter5.250
Seal Height0.040
Max. Temp C110
Alt. Part No.R80250
BUN-353
Backup Contoured NBR90 BS353 - 5.000 X 5.375 X 0.060" R80353 67059182
79
BUN-353 - Backup Contoured NBR90 BS353 - 5.000 X 5.375 X 0.060" R80353 67059182
Product Information
Product CodeBUN-353
DescriptionBackup Contoured NBR90 BS353 - 5.000 X 5.375 X 0.060" R80353 67059182
ProfileBUN
Internal Diameter5.000
Outer Diameter5.375
Seal Height0.060
Max. Temp C110
Alt. Part No.R80353
BUN-429
Backup Contoured NBR90 BS429 - 5.000 X 5.500 X 0.096"
157
BUN-429 - Backup Contoured NBR90 BS429 - 5.000 X 5.500 X 0.096"
Product Information
Product CodeBUN-429
DescriptionBackup Contoured NBR90 BS429 - 5.000 X 5.500 X 0.096"
ProfileBUN
Internal Diameter5.000
Outer Diameter5.500
Seal Height0.096
Max. Temp C110
Alt. Part No.R80429
BUN-251
Backup Contoured NBR90 BS251 - 5.125 X 5.375 X 0.040" 75172065 N8-90-251 OLD CODE 130.63 X 136.62 X
57
BUN-251 - Backup Contoured NBR90 BS251 - 5.125 X 5.375 X 0.040" 75172065 N8-90-251 OLD CODE 130.63 X 136.62 X
Product Information
Product CodeBUN-251
DescriptionBackup Contoured NBR90 BS251 - 5.125 X 5.375 X 0.040" 75172065 N8-90-251 OLD CODE 130.63 X 136.62 X
ProfileBUN
Internal Diameter5.125
Outer Diameter5.375
Seal Height0.040
Max. Temp C110
Alt. Part No.R80251
BUN-354
Backup Contoured NBR90 BS354 - 5.125 X 5.500 X 0.060"
649
BUN-354 - Backup Contoured NBR90 BS354 - 5.125 X 5.500 X 0.060"
Product Information
Product CodeBUN-354
DescriptionBackup Contoured NBR90 BS354 - 5.125 X 5.500 X 0.060"
ProfileBUN
Internal Diameter5.125
Outer Diameter5.500
Seal Height0.060
Max. Temp C110
Alt. Part No.R80354
BUN-430
Backup Contoured NBR90 BS430 - 5.125 X 5.625 X 0.096"
72
BUN-430 - Backup Contoured NBR90 BS430 - 5.125 X 5.625 X 0.096"
Product Information
Product CodeBUN-430
DescriptionBackup Contoured NBR90 BS430 - 5.125 X 5.625 X 0.096"
ProfileBUN
Internal Diameter5.125
Outer Diameter5.625
Seal Height0.096
Max. Temp C110
Alt. Part No.R80430
BUN-050
Backup Contoured NBR90 BS050 - 5.250 X 5.375 X 0.045"
0
BUN-050 - Backup Contoured NBR90 BS050 - 5.250 X 5.375 X 0.045"
Product Information
Product CodeBUN-050
DescriptionBackup Contoured NBR90 BS050 - 5.250 X 5.375 X 0.045"
ProfileBUN
Internal Diameter5.250
Outer Diameter5.375
Seal Height0.045
Max. Temp C110
Alt. Part No.R80050
BUN-160
Backup Contoured NBR90 BS160 - 5.250 X 5.438 X 0.045" 67059035 75189619 133.80 X 138.10 X 1.14mm N8-
0
BUN-160 - Backup Contoured NBR90 BS160 - 5.250 X 5.438 X 0.045" 67059035 75189619 133.80 X 138.10 X 1.14mm N8-
Product Information
Product CodeBUN-160
DescriptionBackup Contoured NBR90 BS160 - 5.250 X 5.438 X 0.045" 67059035 75189619 133.80 X 138.10 X 1.14mm N8-
ProfileBUN
Internal Diameter5.250
Outer Diameter5.438
Seal Height0.045
Max. Temp C110
Alt. Part No.R80160
BUN-252
Backup Contoured NBR90 BS252 - 5.250 X 5.500 X 0.040" 75172067 67059105 N8-90-252 OLD CODE 133.80 X
60
BUN-252 - Backup Contoured NBR90 BS252 - 5.250 X 5.500 X 0.040" 75172067 67059105 N8-90-252 OLD CODE 133.80 X
Product Information
Product CodeBUN-252
DescriptionBackup Contoured NBR90 BS252 - 5.250 X 5.500 X 0.040" 75172067 67059105 N8-90-252 OLD CODE 133.80 X
ProfileBUN
Internal Diameter5.250
Outer Diameter5.500
Seal Height0.040
Max. Temp C110
Alt. Part No.R80252
BUN-355
Backup Contoured NBR90 BS355 - 5.250 X 5.625 X 0.060"
0
BUN-355 - Backup Contoured NBR90 BS355 - 5.250 X 5.625 X 0.060"
Product Information
Product CodeBUN-355
DescriptionBackup Contoured NBR90 BS355 - 5.250 X 5.625 X 0.060"
ProfileBUN
Internal Diameter5.250
Outer Diameter5.625
Seal Height0.060
Max. Temp C110
Alt. Part No.R80355
 
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