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Home » Technical » Design Recommendations » Groove Design Chart for PTFE O-Rings

Groove Design Suggestion for PTFE O-Rings

PTFE O-Ring grooves are similar to those of rubber O-Rings except that due to the relative stiffness of the material, less squeeze is applied. The groove width is also generally less since PTFE O-Rings are much less likely to roll in reciprocating applications than their elastomeric counterparts. A surface finish or 16 rms or less is ideal, however rougher surfaces are acceptable if a shorter seal life is acceptable. A radius of .005” is advisable on the groove corners.

AS568 O-Ring No. Nominal ID Range Cross-Section Min. Squeeze Groove Width
004 thru 048 5/64" to 4-3/4" .070" ± .003" .005" .080"
106 thru 157 3/16" to 4-1/2" .103" ± .003" .006" .110"
204 thru 248 3/8" to 4-3/4" .139" ± .004" .007" .160"
320 thru 350 1-1/8" to 4-5/8" .210" ± .005" .008" .240"
425 thru 441 4-1/2" to 7" .275" ± .006" .010" .315"