John
There is no conversion. Pipe thread is pipe thread which is a tapered thread and seals on the thread hence pipe tape pipe dope which is used to seal the thread. The taper is what seals and the tape or dope help from any liquid or air bypass. AN adapters and fittings are a strait thread. These types of fittings seal on a surface weather it be on the degree of the male and female contact point (37 or 45 degree)or on the actual surface where the nut would come into contact. Thats where you would use a crush washer or o-ring. In relation to pipe and AN in our industry everything is based in 1/16's of an inch. I don't no of any or have never used a - size smaller than -2 which is 1/8" in relation.
The sizes are as follows. 1/8= -2 which is 1/8 pipe, 3/16= -3 no pipe size 1/4= -4 which is 1/4 pipe, 5/16= -5 no pipe size, 3/8= -6 which is 3/8 pipe, 1/2= -8 which is 1/2 pipe, 5/8= -10 no pipe, 3/4= -12 which is 3/4 pipe, -14= 7/8 no pipe, -16= 1" which is 1" pipe, and so on. These are the most common used in our industry. Hope this makes it clear.
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