This info should be available from O-ring manufacturers.
Generaly all o-rings have to be installed in the groove.
Without groove o-ring will not seal, as you tighten it will stretch and pull
etc. You could use it for banjo fitting if it has groove. Afaik banjio fittings
seal using high pressure over small area, copper washers may work well.
Leon
85 Subwagen Westy

11/14/02 7:27:58 PM, Myron Lind <mdlind@RICA.NET> wrote:

>Hi folks
>
>Do any of you specialty technical types know how much an o ring is supposed
>to compress. Is there a percent of thickness or ratio of thickness for how
>deep and wide the groove is vs. the o ring?
>
>Also, any reason I couldn't use o rings for a banjo type fitting?
>
>Thanks for any help
>
>Myron Lind
>Harrisonburg, VA
>
>