Copper crush washer installation
There's a very nice Service Table of Limits from Lycoming, SSP-1776, currently revision 5. On page 2-30, there is a table within instructions for installing crush gaskets. On my IO-540, the screen plug is a 1" x 20 pitch thread plug made of aluminum. In my case, I turn the plug in until it is fully contacting the washer, then another 135º. Safety wire in place. Done.
Hopefully this takes some of the guess work out of the process.
An MS35769-21 is the right part at only 68¢ each from Spruce...solid copper gaskets in 1" ID can also be bought and will work, although the pricing is insignificant IMO and I just buy the correct part number in volume to have on hand. Either way, you can use the same installation process.
Better yet, why not use something like this....the drain plug from my 1997 Ford Ranger:
https://www.partsgeek.com/gbproducts/WC/5513-01122927.html
The o-ring under the bolt flange is contained by the flange groove and does not fall out when removed. Also, by design the o-ring crush depth is controlled by the bolt flange bottoming out on the oil pan. And best of all.....it never leaks. No replaceable gasket required (unless the o-ring were to get nicked).
I agree, for the
drain plug, but the OP question was regarding the
oil screen plug, which a quick drain won't do the job. {you are pulling and inspecting the screen with each oil change, right? }
For the
drain plug, I personally use, and recommend
Stahlbus quick drain, the correct size 1/2-14