Do yourself a favor and change the chuck on the inflator to one of these JACO lightning chucks. They lock on with a push and stay on with no leakage.
https://jacosuperiorproducts.com/products/lightning-s2-tire-air-chuck-2pack
It depends on the fastener size, thread pitch, grade, and if lubricated or dry, in your case lubed. There are many charts available on the Internet. Here’s one, note that smaller than half inch the values are in inch pounds.