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Groove Design Suggestion for Four-Lobed Seals
Because of their unique four-lobed geometry, four-lobed seal grooves are different than those for O-Rings. Generally, four-lobed seal grooves are deeper since less squeeze is required to create a positive seal. Four-lobed seal grooves are also more narrow due to their ability to resist “spiral failure” better than O-Rings do. The following chart presents general recommendations for four-lobed seal grooves.
| Seal No. | Cross-Section | Depth (dynamic) | Depth (static) | Width |
| 004 thru 050 | .070" ± .003" | .060"/.062" | .050"/.057" | .080" |
| 103 thru 170 | .103" ± .003" | .093"/.095" | .088"/.090" | .115" |
| 204 thru 276 | .139" ± .004" | .127"/.129" | .121"/.123" | .155" |
| 312 thru 382 | .210" ± .005" | .195"/.197" | .187"/.189" | .240" |
| 425 thru 464 | .275" ± .006" | .255"/.257" | .243"/.245" | .310" |
