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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-342
Backup Contoured NBR90 BS342 - 3.625 X 4.000 X 0.060" 75172170 67059171 N8-90-342 OLD CODE 92.65 X 1
268
BUN-342 - Backup Contoured NBR90 BS342 - 3.625 X 4.000 X 0.060" 75172170 67059171 N8-90-342 OLD CODE 92.65 X 1
Product Information
Product CodeBUN-342
DescriptionBackup Contoured NBR90 BS342 - 3.625 X 4.000 X 0.060" 75172170 67059171 N8-90-342 OLD CODE 92.65 X 1
ProfileBUN
Internal Diameter3.625
Outer Diameter4.000
Seal Height0.060
Max. Temp C110
Alt. Part No.R80342
BUN-044
Backup Contoured NBR90 BS044 - 3.750 X 3.875 X 0.045"
0
BUN-044 - Backup Contoured NBR90 BS044 - 3.750 X 3.875 X 0.045"
Product Information
Product CodeBUN-044
DescriptionBackup Contoured NBR90 BS044 - 3.750 X 3.875 X 0.045"
ProfileBUN
Internal Diameter3.750
Outer Diameter3.875
Seal Height0.045
Max. Temp C110
Alt. Part No.R80044
BUN-154
Backup Contoured NBR90 BS154 - 3.750 X 3.938 X 0.045"
0
BUN-154 - Backup Contoured NBR90 BS154 - 3.750 X 3.938 X 0.045"
Product Information
Product CodeBUN-154
DescriptionBackup Contoured NBR90 BS154 - 3.750 X 3.938 X 0.045"
ProfileBUN
Internal Diameter3.750
Outer Diameter3.938
Seal Height0.045
Max. Temp C110
Alt. Part No.R80154
BUN-240
Backup Contoured NBR90 BS240 - 3.750 X 4.000 X 0.040" 67059093 95.40 X 3.00 X 1.02mm 75172035
349
BUN-240 - Backup Contoured NBR90 BS240 - 3.750 X 4.000 X 0.040" 67059093 95.40 X 3.00 X 1.02mm 75172035
Product Information
Product CodeBUN-240
DescriptionBackup Contoured NBR90 BS240 - 3.750 X 4.000 X 0.040" 67059093 95.40 X 3.00 X 1.02mm 75172035
ProfileBUN
Internal Diameter3.750
Outer Diameter4.000
Seal Height0.040
Max. Temp C110
Alt. Part No.R80240
BUN-240S
Backup Contoured NBR70 BS240 - 3.750 X 4.000 X 0.040"
-
Enquire
BUN-240S - Backup Contoured NBR70 BS240 - 3.750 X 4.000 X 0.040"
Product Information
Product CodeBUN-240S
DescriptionBackup Contoured NBR70 BS240 - 3.750 X 4.000 X 0.040"
ProfileBUN
Internal Diameter3.750
Outer Diameter4.000
Seal Height0.040
Max. Temp C110
Alt. Part No.R80240S
BUN-343
Backup Contoured NBR90 BS343 - 3.750 X 4.125 X 0.060" 67059172 75172173 95.83 X 105.13 X 1.80mm N8-9
253
BUN-343 - Backup Contoured NBR90 BS343 - 3.750 X 4.125 X 0.060" 67059172 75172173 95.83 X 105.13 X 1.80mm N8-9
Product Information
Product CodeBUN-343
DescriptionBackup Contoured NBR90 BS343 - 3.750 X 4.125 X 0.060" 67059172 75172173 95.83 X 105.13 X 1.80mm N8-9
ProfileBUN
Internal Diameter3.750
Outer Diameter4.125
Seal Height0.060
Max. Temp C110
Alt. Part No.R80343
BUN-241
Backup Contoured NBR90 BS241 - 3.875 X 4.125 X 0.040"
21
BUN-241 - Backup Contoured NBR90 BS241 - 3.875 X 4.125 X 0.040"
Product Information
Product CodeBUN-241
DescriptionBackup Contoured NBR90 BS241 - 3.875 X 4.125 X 0.040"
ProfileBUN
Internal Diameter3.875
Outer Diameter4.125
Seal Height0.040
Max. Temp C110
Alt. Part No.R80241
BUN-344
Backup Contoured NBR90 BS344 - 3.875 X 4.250 X 0.060" R80344 67059173
0
BUN-344 - Backup Contoured NBR90 BS344 - 3.875 X 4.250 X 0.060" R80344 67059173
Product Information
Product CodeBUN-344
DescriptionBackup Contoured NBR90 BS344 - 3.875 X 4.250 X 0.060" R80344 67059173
ProfileBUN
Internal Diameter3.875
Outer Diameter4.250
Seal Height0.060
Max. Temp C110
Alt. Part No.R80344
BUN-045
Backup Contoured NBR90 BS045 - 4.000 X 4.125 X 0.045"
0
BUN-045 - Backup Contoured NBR90 BS045 - 4.000 X 4.125 X 0.045"
Product Information
Product CodeBUN-045
DescriptionBackup Contoured NBR90 BS045 - 4.000 X 4.125 X 0.045"
ProfileBUN
Internal Diameter4.000
Outer Diameter4.125
Seal Height0.045
Max. Temp C110
Alt. Part No.R80045
BUN-155
Backup Contoured NBR90 BS155 - 4.000 X 4.188 X 0.045"
0
BUN-155 - Backup Contoured NBR90 BS155 - 4.000 X 4.188 X 0.045"
Product Information
Product CodeBUN-155
DescriptionBackup Contoured NBR90 BS155 - 4.000 X 4.188 X 0.045"
ProfileBUN
Internal Diameter4.000
Outer Diameter4.188
Seal Height0.045
Max. Temp C110
Alt. Part No.R80155
BUN-242
Backup Contoured NBR90 BS242 - 4.000 X 4.250 X 0.040" 75172042 67059095 101.75 X 107.74 X 1.20mm N8-
284
BUN-242 - Backup Contoured NBR90 BS242 - 4.000 X 4.250 X 0.040" 75172042 67059095 101.75 X 107.74 X 1.20mm N8-
Product Information
Product CodeBUN-242
DescriptionBackup Contoured NBR90 BS242 - 4.000 X 4.250 X 0.040" 75172042 67059095 101.75 X 107.74 X 1.20mm N8-
ProfileBUN
Internal Diameter4.000
Outer Diameter4.250
Seal Height0.040
Max. Temp C110
Alt. Part No.R80242
BUN-345
Backup Contoured NBR90 BS345 - 4.000 X 4.375 X 0.060"
116
BUN-345 - Backup Contoured NBR90 BS345 - 4.000 X 4.375 X 0.060"
Product Information
Product CodeBUN-345
DescriptionBackup Contoured NBR90 BS345 - 4.000 X 4.375 X 0.060"
ProfileBUN
Internal Diameter4.000
Outer Diameter4.375
Seal Height0.060
Max. Temp C110
Alt. Part No.R80345
BUN-243
Backup Contoured NBR90 BS243 - 4.125 X 4.375 X 0.040" 67059096 75172045 104.92 X 1.02mm N8-90-243 OL
146
BUN-243 - Backup Contoured NBR90 BS243 - 4.125 X 4.375 X 0.040" 67059096 75172045 104.92 X 1.02mm N8-90-243 OL
Product Information
Product CodeBUN-243
DescriptionBackup Contoured NBR90 BS243 - 4.125 X 4.375 X 0.040" 67059096 75172045 104.92 X 1.02mm N8-90-243 OL
ProfileBUN
Internal Diameter4.125
Outer Diameter4.375
Seal Height0.040
Max. Temp C110
Alt. Part No.R80243
BUN-346
Backup Contoured NBR90 BS346 - 4.125 X 4.500 X 0.060" 67059175 75172180 105.48 X 114.78 X 1.80mm N8-
102
BUN-346 - Backup Contoured NBR90 BS346 - 4.125 X 4.500 X 0.060" 67059175 75172180 105.48 X 114.78 X 1.80mm N8-
Product Information
Product CodeBUN-346
DescriptionBackup Contoured NBR90 BS346 - 4.125 X 4.500 X 0.060" 67059175 75172180 105.48 X 114.78 X 1.80mm N8-
ProfileBUN
Internal Diameter4.125
Outer Diameter4.500
Seal Height0.060
Max. Temp C110
Alt. Part No.R80346
BUN-046
Backup Contoured NBR90 BS046 - 4.250 X 4.375 X 0.045"
0
BUN-046 - Backup Contoured NBR90 BS046 - 4.250 X 4.375 X 0.045"
Product Information
Product CodeBUN-046
DescriptionBackup Contoured NBR90 BS046 - 4.250 X 4.375 X 0.045"
ProfileBUN
Internal Diameter4.250
Outer Diameter4.375
Seal Height0.045
Max. Temp C110
Alt. Part No.R80046
BUN-156
Backup Contoured NBR90 BS156 - 4.250 X 4.438 X 0.045"
50
BUN-156 - Backup Contoured NBR90 BS156 - 4.250 X 4.438 X 0.045"
Product Information
Product CodeBUN-156
DescriptionBackup Contoured NBR90 BS156 - 4.250 X 4.438 X 0.045"
ProfileBUN
Internal Diameter4.250
Outer Diameter4.438
Seal Height0.045
Max. Temp C110
Alt. Part No.R80156
BUN-244
Backup Contoured NBR90 BS244 - 4.250 X 4.500 X 0.040" N8-90-244 OLD CODE
70
BUN-244 - Backup Contoured NBR90 BS244 - 4.250 X 4.500 X 0.040" N8-90-244 OLD CODE
Product Information
Product CodeBUN-244
DescriptionBackup Contoured NBR90 BS244 - 4.250 X 4.500 X 0.040" N8-90-244 OLD CODE
ProfileBUN
Internal Diameter4.250
Outer Diameter4.500
Seal Height0.040
Max. Temp C110
Alt. Part No.R80244
BUN-347
Backup Contoured NBR90 BS347 - 4.250 X 4.625 X 0.060"
25
BUN-347 - Backup Contoured NBR90 BS347 - 4.250 X 4.625 X 0.060"
Product Information
Product CodeBUN-347
DescriptionBackup Contoured NBR90 BS347 - 4.250 X 4.625 X 0.060"
ProfileBUN
Internal Diameter4.250
Outer Diameter4.625
Seal Height0.060
Max. Temp C110
Alt. Part No.R80347
BUN-245
Backup Contoured NBR90 BS245 - 4.375 X 4.625 X 0.040"
0
BUN-245 - Backup Contoured NBR90 BS245 - 4.375 X 4.625 X 0.040"
Product Information
Product CodeBUN-245
DescriptionBackup Contoured NBR90 BS245 - 4.375 X 4.625 X 0.040"
ProfileBUN
Internal Diameter4.375
Outer Diameter4.625
Seal Height0.040
Max. Temp C110
Alt. Part No.R80245
BUN-348
Backup Contoured NBR90 BS348 - 4.375 X 4.750 X 0.060" 75172185 67059177 111.83 X 121.13 X 1.80mm N8-
223
BUN-348 - Backup Contoured NBR90 BS348 - 4.375 X 4.750 X 0.060" 75172185 67059177 111.83 X 121.13 X 1.80mm N8-
Product Information
Product CodeBUN-348
DescriptionBackup Contoured NBR90 BS348 - 4.375 X 4.750 X 0.060" 75172185 67059177 111.83 X 121.13 X 1.80mm N8-
ProfileBUN
Internal Diameter4.375
Outer Diameter4.750
Seal Height0.060
Max. Temp C110
Alt. Part No.R80348
BUN-047
Backup Contoured NBR90 BS047 - 4.500 X 4.625 X 0.045"
0
BUN-047 - Backup Contoured NBR90 BS047 - 4.500 X 4.625 X 0.045"
Product Information
Product CodeBUN-047
DescriptionBackup Contoured NBR90 BS047 - 4.500 X 4.625 X 0.045"
ProfileBUN
Internal Diameter4.500
Outer Diameter4.625
Seal Height0.045
Max. Temp C110
Alt. Part No.R80047
BUN-157
Backup Contoured NBR90 BS157 - 4.500 X 4.688 X 0.045"
0
BUN-157 - Backup Contoured NBR90 BS157 - 4.500 X 4.688 X 0.045"
Product Information
Product CodeBUN-157
DescriptionBackup Contoured NBR90 BS157 - 4.500 X 4.688 X 0.045"
ProfileBUN
Internal Diameter4.500
Outer Diameter4.688
Seal Height0.045
Max. Temp C110
Alt. Part No.R80157
BUN-246
Backup Contoured NBR90 BS246 - 4.500 X 4.750 X 0.040"
0
BUN-246 - Backup Contoured NBR90 BS246 - 4.500 X 4.750 X 0.040"
Product Information
Product CodeBUN-246
DescriptionBackup Contoured NBR90 BS246 - 4.500 X 4.750 X 0.040"
ProfileBUN
Internal Diameter4.500
Outer Diameter4.750
Seal Height0.040
Max. Temp C110
Alt. Part No.R80246
BUN-349
Backup Contoured NBR90 BS349 - 4.500 X 4.875 X 0.060"
42
BUN-349 - Backup Contoured NBR90 BS349 - 4.500 X 4.875 X 0.060"
Product Information
Product CodeBUN-349
DescriptionBackup Contoured NBR90 BS349 - 4.500 X 4.875 X 0.060"
ProfileBUN
Internal Diameter4.500
Outer Diameter4.875
Seal Height0.060
Max. Temp C110
Alt. Part No.R80349
 
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