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BUT
Design
    • Provides exceptional extrusion resistance to a paired oring to increase pressure handling capabilities.
    • Ideal in applications where low friction is a priority.
    • Can be used as a backup to a hydraulic seal or an oring.
    • PTFE will 'cold-flow' into an extrusion gap to provide superior extrusion resistance to Nitrile.
Material
    • PTFE
Application
    • Suitable for static and dynamic applications.
    • Suitable for high pressure and heavy duty applications where additional resistance to extrusion is required.
Fluids
    • Hydraulic fluids, petroleum fuels and oils

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Product Code
Description
Availability
Qty
BUT-351
Backup PTFE BS351 - 4.778 X 5.144 X 0.07"
5
BUT-351 - Backup PTFE BS351 - 4.778 X 5.144 X 0.07"
Product Information
Product CodeBUT-351
DescriptionBackup PTFE BS351 - 4.778 X 5.144 X 0.07"
ProfileBUT
Internal Diameter4.778
Outer Diameter5.144
Seal Height0.070
Max. Temp C260
Alt. Part No.RMS351
BUT-427
Backup PTFE BS427 - 4.801 X 5.273 X 0.105"
79
BUT-427 - Backup PTFE BS427 - 4.801 X 5.273 X 0.105"
Product Information
Product CodeBUT-427
DescriptionBackup PTFE BS427 - 4.801 X 5.273 X 0.105"
ProfileBUT
Internal Diameter4.801
Outer Diameter5.273
Seal Height0.105
Max. Temp C260
Alt. Part No.RMS427
BUT-249
Backup PTFE BS249 - 4.88 X 5.118 X 0.049"
52
BUT-249 - Backup PTFE BS249 - 4.88 X 5.118 X 0.049"
Product Information
Product CodeBUT-249
DescriptionBackup PTFE BS249 - 4.88 X 5.118 X 0.049"
ProfileBUT
Internal Diameter4.880
Outer Diameter5.118
Seal Height0.049
Max. Temp C260
Alt. Part No.RMS249
BUT-352
Backup PTFE BS352 - 4.903 X 5.269 X 0.07"
100
BUT-352 - Backup PTFE BS352 - 4.903 X 5.269 X 0.07"
Product Information
Product CodeBUT-352
DescriptionBackup PTFE BS352 - 4.903 X 5.269 X 0.07"
ProfileBUT
Internal Diameter4.903
Outer Diameter5.269
Seal Height0.070
Max. Temp C260
Alt. Part No.RMS352
BUT-428
Backup PTFE BS428 - 4.926 X 5.398 X 0.105"
0
BUT-428 - Backup PTFE BS428 - 4.926 X 5.398 X 0.105"
Product Information
Product CodeBUT-428
DescriptionBackup PTFE BS428 - 4.926 X 5.398 X 0.105"
ProfileBUT
Internal Diameter4.926
Outer Diameter5.398
Seal Height0.105
Max. Temp C260
Alt. Part No.RMS428
BUTM-P005
Backup PTFE P005 - 5.00 X 8.00 X 1.25mm
20
BUTM-P005 - Backup PTFE P005 - 5.00 X 8.00 X 1.25mm
Product Information
Product CodeBUTM-P005
DescriptionBackup PTFE P005 - 5.00 X 8.00 X 1.25mm
ProfileBUT
Internal Diameter5.00
Outer Diameter8.00
Seal Height1.25
Max. Temp C260
BUT-159
Backup PTFE BS159 - 5.005 X 5.181 X 0.05"
0
BUT-159 - Backup PTFE BS159 - 5.005 X 5.181 X 0.05"
Product Information
Product CodeBUT-159
DescriptionBackup PTFE BS159 - 5.005 X 5.181 X 0.05"
ProfileBUT
Internal Diameter5.005
Outer Diameter5.181
Seal Height0.050
Max. Temp C260
Alt. Part No.RMS159
BUT-250
Backup PTFE BS250 - 5.005 X 5.243 X 0.049"
34
BUT-250 - Backup PTFE BS250 - 5.005 X 5.243 X 0.049"
Product Information
Product CodeBUT-250
DescriptionBackup PTFE BS250 - 5.005 X 5.243 X 0.049"
ProfileBUT
Internal Diameter5.005
Outer Diameter5.243
Seal Height0.049
Max. Temp C260
Alt. Part No.RMS250
BUT-049
Backup PTFE BS049 - 5.023 X 5.129 X 0.049"
0
BUT-049 - Backup PTFE BS049 - 5.023 X 5.129 X 0.049"
Product Information
Product CodeBUT-049
DescriptionBackup PTFE BS049 - 5.023 X 5.129 X 0.049"
ProfileBUT
Internal Diameter5.023
Outer Diameter5.129
Seal Height0.049
Max. Temp C260
Alt. Part No.RMS049
BUT-353
Backup PTFE BS353 - 5.028 X 5.394 X 0.07"
0
BUT-353 - Backup PTFE BS353 - 5.028 X 5.394 X 0.07"
Product Information
Product CodeBUT-353
DescriptionBackup PTFE BS353 - 5.028 X 5.394 X 0.07"
ProfileBUT
Internal Diameter5.028
Outer Diameter5.394
Seal Height0.070
Max. Temp C260
Alt. Part No.RMS353
BUT-429
Backup PTFE BS429 - 5.051 X 5.523 X 0.105"
9
BUT-429 - Backup PTFE BS429 - 5.051 X 5.523 X 0.105"
Product Information
Product CodeBUT-429
DescriptionBackup PTFE BS429 - 5.051 X 5.523 X 0.105"
ProfileBUT
Internal Diameter5.051
Outer Diameter5.523
Seal Height0.105
Max. Temp C260
Alt. Part No.RMS429
BUT-437
Backup PTFE BS437 - 5.051 X 5.523 X 0.105"
8
BUT-437 - Backup PTFE BS437 - 5.051 X 5.523 X 0.105"
Product Information
Product CodeBUT-437
DescriptionBackup PTFE BS437 - 5.051 X 5.523 X 0.105"
ProfileBUT
Internal Diameter5.051
Outer Diameter5.523
Seal Height0.105
Max. Temp C260
Alt. Part No.RMS437
BUT-251
Backup PTFE BS251 - 5.13 X 5.368 X 0.049"
8
BUT-251 - Backup PTFE BS251 - 5.13 X 5.368 X 0.049"
Product Information
Product CodeBUT-251
DescriptionBackup PTFE BS251 - 5.13 X 5.368 X 0.049"
ProfileBUT
Internal Diameter5.130
Outer Diameter5.368
Seal Height0.049
Max. Temp C260
Alt. Part No.RMS251
BUT-354
Backup PTFE BS354 - 5.153 X 5.519 X 0.07"
14
BUT-354 - Backup PTFE BS354 - 5.153 X 5.519 X 0.07"
Product Information
Product CodeBUT-354
DescriptionBackup PTFE BS354 - 5.153 X 5.519 X 0.07"
ProfileBUT
Internal Diameter5.153
Outer Diameter5.519
Seal Height0.070
Max. Temp C260
Alt. Part No.RMS354
BUT-430
Backup PTFE BS430 - 5.176 X 5.648 X 0.105"
0
BUT-430 - Backup PTFE BS430 - 5.176 X 5.648 X 0.105"
Product Information
Product CodeBUT-430
DescriptionBackup PTFE BS430 - 5.176 X 5.648 X 0.105"
ProfileBUT
Internal Diameter5.176
Outer Diameter5.648
Seal Height0.105
Max. Temp C260
Alt. Part No.RMS430
BUT-438
Backup PTFE BS438 - 5.252 X 5.724 X 0.108" 75089669 158.80 X 170.79 X 2.70mm ST438S
104
BUT-438 - Backup PTFE BS438 - 5.252 X 5.724 X 0.108" 75089669 158.80 X 170.79 X 2.70mm ST438S
Product Information
Product CodeBUT-438
DescriptionBackup PTFE BS438 - 5.252 X 5.724 X 0.108" 75089669 158.80 X 170.79 X 2.70mm ST438S
ProfileBUT
Internal Diameter5.252
Outer Diameter5.724
Seal Height0.108
Max. Temp C260
Alt. Part No.RMS438
BUT-160
Backup PTFE BS160 - 5.255 X 5.431 X 0.05"
0
BUT-160 - Backup PTFE BS160 - 5.255 X 5.431 X 0.05"
Product Information
Product CodeBUT-160
DescriptionBackup PTFE BS160 - 5.255 X 5.431 X 0.05"
ProfileBUT
Internal Diameter5.255
Outer Diameter5.431
Seal Height0.050
Max. Temp C260
Alt. Part No.RMS160
BUT-252
Backup PTFE BS252 - 5.255 X 5.493 X 0.049"
8
BUT-252 - Backup PTFE BS252 - 5.255 X 5.493 X 0.049"
Product Information
Product CodeBUT-252
DescriptionBackup PTFE BS252 - 5.255 X 5.493 X 0.049"
ProfileBUT
Internal Diameter5.255
Outer Diameter5.493
Seal Height0.049
Max. Temp C260
Alt. Part No.RMS252
BUT-050
Backup PTFE BS050 - 5.273 X 5.379 X 0.049"
0
BUT-050 - Backup PTFE BS050 - 5.273 X 5.379 X 0.049"
Product Information
Product CodeBUT-050
DescriptionBackup PTFE BS050 - 5.273 X 5.379 X 0.049"
ProfileBUT
Internal Diameter5.273
Outer Diameter5.379
Seal Height0.049
Max. Temp C260
Alt. Part No.RMS050
BUT-355
Backup PTFE BS355 - 5.278 X 5.644 X 0.07"
0
BUT-355 - Backup PTFE BS355 - 5.278 X 5.644 X 0.07"
Product Information
Product CodeBUT-355
DescriptionBackup PTFE BS355 - 5.278 X 5.644 X 0.07"
ProfileBUT
Internal Diameter5.278
Outer Diameter5.644
Seal Height0.070
Max. Temp C260
Alt. Part No.RMS355
BUT-431
Backup PTFE BS431 - 5.301 X 5.773 X 0.105"
0
BUT-431 - Backup PTFE BS431 - 5.301 X 5.773 X 0.105"
Product Information
Product CodeBUT-431
DescriptionBackup PTFE BS431 - 5.301 X 5.773 X 0.105"
ProfileBUT
Internal Diameter5.301
Outer Diameter5.773
Seal Height0.105
Max. Temp C260
Alt. Part No.RMS431
BUT-253
Backup PTFE BS253 - 5.38 X 5.618 X 0.049"
2
BUT-253 - Backup PTFE BS253 - 5.38 X 5.618 X 0.049"
Product Information
Product CodeBUT-253
DescriptionBackup PTFE BS253 - 5.38 X 5.618 X 0.049"
ProfileBUT
Internal Diameter5.380
Outer Diameter5.618
Seal Height0.049
Max. Temp C260
Alt. Part No.RMS253
BUT-356
Backup PTFE BS356 - 5.403 X 5.769 X 0.070" 75172205 136.52 X 145.82 X 1.70mm ST356S
116
BUT-356 - Backup PTFE BS356 - 5.403 X 5.769 X 0.070" 75172205 136.52 X 145.82 X 1.70mm ST356S
Product Information
Product CodeBUT-356
DescriptionBackup PTFE BS356 - 5.403 X 5.769 X 0.070" 75172205 136.52 X 145.82 X 1.70mm ST356S
ProfileBUT
Internal Diameter5.403
Outer Diameter5.769
Seal Height0.070
Max. Temp C260
Alt. Part No.RMS356
BUT-432
Backup PTFE BS432 - 5.426 X 5.898 X 0.105"
9
BUT-432 - Backup PTFE BS432 - 5.426 X 5.898 X 0.105"
Product Information
Product CodeBUT-432
DescriptionBackup PTFE BS432 - 5.426 X 5.898 X 0.105"
ProfileBUT
Internal Diameter5.426
Outer Diameter5.898
Seal Height0.105
Max. Temp C260
Alt. Part No.RMS432
 
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