Tap and die question


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I need to re tread a bolt on my jointer fence.  It's a 1/2" - 14.  I went and bought a set at harbor freight which had the requisite die size but when I got it home it's way too large.  I must be missing something on how they designate sizing.  Below is a pic of the nut and the die side by side. I want to order the correct one but am worried I'll get the wrong size again. 


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NPT stands for national pipe threads. Pipe threads are different than bolt threads. 1/2" refers to the inside pipe diameter and the outside is close to .9"

I believe what you are looking for is 1/2"-13 NC or 7/16"-14 NC.

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