Hi,

I hope this is the right place to ask this. In general practice, from what I've seen, the general layout when using an O-Ring to seal between 2 surfaces is to have the O-Ring sitting in a groove with a pattern of screws outside of the O-Ring.

However, in an application, we have to use an O-Ring to seal an enclosure from ingress of ambient air. Our enclosure is sheet metal, and will have several points of failure (PEMs, tack welds, etc.). A solution to alleviate these points of failure was to have the screws mounted inside the O-Ring; if the screws provide enough force to seal the O-Ring outside of the screw pattern, the O-Ring will eliminate any ambient air to contact the failure points.

Is there any standard that defines the positional relationship of screws and O-Rings? Any help would be mucha ppreciated. Thank you.