Don't know off hand. There are only a few very common sizes. Take it out and go to the parts store and they can match it. If you were a bit closer you could come and get one out of our boxes. We have ALOT of grease fittings....lol. Takes two to three tubes to grease a truck with a loader.
"But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.” Joshua 25:15