water proof bulkhead SMA connector
Short answer: maybe.

Long answer:  If you'd like to KNOW whether this will work, you need to try it, building it reproducibly, and test it to see if it can uniformly meet your specs.  Usually, it's more economically sound to buy the part that is rated for such use and follow the directions on how to use it correctly.

If a leak is not a disaster, you don't have to test as rigorously.