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Oil-Resistant Buna-N Backup Rings
Made of Buna-N, these backup rings resist grease, petroleum fluids, and motor oil. Use them to extend the life of your O-rings and improve their performance in high-pressure applications.
For technical drawings and 3-D models, click on a part number.
| For Dash Number | ID | OD | Thick. | Hardness | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
0.053" Wide | |||||||||
|---|---|---|---|---|---|---|---|---|---|
004 | 0.096" | 0.202" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 0000000 | 00000 |
| 005 | 0.127" | 0.233" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 006 | 0.140" | 0.246" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 007 | 0.171" | 0.277" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 008 | 0.202" | 0.308" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 009 | 0.234" | 0.340" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 010 | 0.265" | 0.371" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 011 | 0.327" | 0.433" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 012 | 0.390" | 0.496" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 013 | 0.455" | 0.561" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 014 | 0.518" | 0.624" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 0000000 | 0000 |
| 015 | 0.580" | 0.686" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 016 | 0.643" | 0.749" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 017 | 0.705" | 0.811" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 018 | 0.768" | 0.874" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 019 | 0.830" | 0.936" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 020 | 0.893" | 0.999" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 021 | 0.955" | 1.061" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 022 | 1.018" | 1.124" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 024 | 1.143" | 1.249" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 0000000 | 0000 |
| 025 | 1.205" | 1.311" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 026 | 1.268" | 1.374" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 028 | 1.393" | 1.499" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 029 | 1.518" | 1.624" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 031 | 1.768" | 1.874" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 00000 |
| 042 | 3.268" | 3.374" | 0.049" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 00000 |
Ultra-Chemical-Resistant PTFE Backup Rings
These PTFE backup rings resist harsh chemicals, such as acetone, fluorinated solvents, methanol, and many acids. Use them to extend the life of your O-rings and improve their performance in high-pressure applications.
For technical drawings and 3-D models, click on a part number.
| For Dash Number | Thick. | ID | OD | Hardness | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
0.053" Wide | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 005 | 0.049" | 0.124" | 0.230" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 000000 |
| 006 | 0.049" | 0.140" | 0.246" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 007 | 0.049" | 0.171" | 0.277" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 008 | 0.049" | 0.202" | 0.308" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 009 | 0.049" | 0.234" | 0.340" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 010 | 0.049" | 0.265" | 0.371" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 011 | 0.049" | 0.327" | 0.433" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 012 | 0.049" | 0.390" | 0.496" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 013 | 0.049" | 0.455" | 0.561" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 014 | 0.049" | 0.518" | 0.624" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 015 | 0.049" | 0.580" | 0.686" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 016 | 0.049" | 0.643" | 0.749" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 017 | 0.049" | 0.705" | 0.811" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 018 | 0.049" | 0.768" | 0.874" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 019 | 0.049" | 0.801" | 0.907" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 00000000 | 00000 |
| 020 | 0.049" | 0.864" | 0.970" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 00000000 | 00000 |
| 021 | 0.049" | 0.926" | 1.032" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 00000000 | 00000 |
| 022 | 0.049" | 0.989" | 1.095" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 00000000 | 00000 |
| 024 | 0.049" | 1.114" | 1.220" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 025 | 0.049" | 1.176" | 1.282" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 026 | 0.049" | 1.239" | 1.345" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 028 | 0.049" | 1.364" | 1.470" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 029 | 0.049" | 1.489" | 1.595" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 031 | 0.049" | 1.739" | 1.845" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 0000 |
0.086" Wide | |||||||||
| 109 | 0.049" | 0.299" | 0.471" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 00000000 | 00000 |
| 110 | 0.049" | 0.390" | 0.562" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 111 | 0.049" | 0.452" | 0.624" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 112 | 0.049" | 0.515" | 0.687" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 113 | 0.049" | 0.577" | 0.749" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 114 | 0.049" | 0.640" | 0.812" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 115 | 0.049" | 0.702" | 0.874" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 116 | 0.049" | 0.765" | 0.937" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 117 | 0.049" | 0.832" | 1.004" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 118 | 0.049" | 0.895" | 1.067" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 119 | 0.049" | 0.957" | 1.129" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 120 | 0.049" | 1.020" | 1.192" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 121 | 0.049" | 1.082" | 1.254" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 124 | 0.049" | 1.237" | 1.409" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 125 | 0.049" | 1.299" | 1.471" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 126 | 0.049" | 1.362" | 1.534" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 128 | 0.049" | 1.487" | 1.659" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 130 | 0.049" | 1.612" | 1.784" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 133 | 0.049" | 1.834" | 2.006" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 134 | 0.049" | 1.862" | 2.034" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 137 | 0.049" | 2.050" | 2.222" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 0000 |
| 141 | 0.049" | 2.300" | 2.472" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 0000000 | 0000 |
| 152 | 0.049" | 3.237" | 3.409" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 158 | 0.049" | 4.737" | 4.909" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
0.119" Wide | |||||||||
| 208 | 0.049" | 0.609" | 0.847" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 00000000 | 00000 |
| 210 | 0.049" | 0.766" | 1.004" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 211 | 0.049" | 0.828" | 1.066" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 212 | 0.049" | 0.891" | 1.129" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 213 | 0.049" | 0.953" | 1.191" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 214 | 0.049" | 1.016" | 1.254" | Durometer 55D (Hard) | -300° to 500° | White | 50 | 0000000 | 00000 |
| 215 | 0.049" | 1.078" | 1.316" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 216 | 0.049" | 1.141" | 1.379" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 217 | 0.049" | 1.203" | 1.441" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 218 | 0.049" | 1.266" | 1.504" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 219 | 0.049" | 1.334" | 1.572" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 220 | 0.049" | 1.359" | 1.597" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 222 | 0.049" | 1.522" | 1.760" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 0000000 | 00000 |
| 223 | 0.049" | 1.609" | 1.847" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 224 | 0.049" | 1.734" | 1.972" | Durometer 55D (Hard) | -300° to 500° | White | 25 | 00000000 | 00000 |
| 225 | 0.049" | 1.859" | 2.097" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 226 | 0.049" | 1.984" | 2.222" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 227 | 0.049" | 2.109" | 2.347" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 228 | 0.049" | 2.234" | 2.472" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 0000000 | 00000 |
| 229 | 0.049" | 2.359" | 2.597" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 230 | 0.049" | 2.484" | 2.722" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 231 | 0.049" | 2.609" | 2.847" | Durometer 55D (Hard) | -300° to 500° | White | 10 | 00000000 | 00000 |
| 232 | 0.049" | 2.734" | 2.972" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 0000 |
| 233 | 0.049" | 2.859" | 3.097" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 234 | 0.049" | 2.984" | 3.222" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 235 | 0.049" | 3.109" | 3.347" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 236 | 0.049" | 3.234" | 3.472" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 237 | 0.049" | 3.359" | 3.597" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 238 | 0.049" | 3.484" | 3.722" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 0000000 | 00000 |
| 239 | 0.049" | 3.609" | 3.847" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 240 | 0.049" | 3.734" | 3.972" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 241 | 0.049" | 3.859" | 4.097" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 242 | 0.049" | 3.984" | 4.222" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 243 | 0.049" | 4.109" | 4.347" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 244 | 0.049" | 4.234" | 4.472" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 245 | 0.049" | 4.359" | 4.597" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 246 | 0.049" | 4.484" | 4.722" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 248 | 0.049" | 4.734" | 4.972" | Durometer 55D (Hard) | -300° to 500° | White | 5 | 00000000 | 00000 |
| 249 | 0.049" | 4.859" | 5.097" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
| 250 | 0.049" | 4.984" | 5.222" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
| 252 | 0.049" | 5.234" | 5.472" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
| 254 | 0.049" | 5.484" | 5.722" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
| 255 | 0.049" | 5.609" | 5.847" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
| 256 | 0.049" | 5.734" | 5.972" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
| 257 | 0.049" | 5.859" | 6.097" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
| 258 | 0.049" | 5.984" | 6.222" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 0000 |
| 261 | 0.049" | 6.734" | 6.972" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 00000000 | 00000 |
| 265 | 0.049" | 7.734" | 7.972" | Durometer 55D (Hard) | -300° to 500° | White | 1 | 0000000 | 00000 |