I'm looking to thread a tube/rod, it measures 0.434". I was looking at charts on the net and their are plenty of drill charts but i'm not seeing anything really for die charts. Some of these charts have a "Major Diameter" column and i'm wondering if that is whats used for the die? If that's the case it looks like a 7/16-32 would work for this size. I don't have that size die but do have a 7/16-20 but holding it up it doesn't look right. I'm looking for fine threads reason i'm thinking of going with a -32. Can any of you master machinists out there help me out! There will be no load on this, it's just to screw on a small attachment.