This side of the globe our grease guns are 1/8 NPT. So are a lot of the adapters. Lincoln 81458 is a common (albeit expensive) one, and NPT to boot.
Robert: If you google "button head coupler" you will come up with a bunch of other brands besides Lincoln. Generally, the lincoln one is $38US if in the States, around $80 in Canada, and if you only pay for the best, the same coupler is $124 from Acklands Grainger. Not sure what brand Fastenal uses, but theirs are very reasonably priced at US $20.
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