I don't have the sizes handy right now. The drain plug uses a plastic washer (a fiber washer is an acceptable replacement). It is possible to damage the pan in a rather unexpected way from over tightening. With the drain plug out the surface which sits under the flange should be flat. When over tightened a dimple will appear at the 6 o'clock position which creates a constant, slow leak. Short of pulling the pan to fix the crushed weep using a healthy amount of teflon tape is a reliable solution.
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