Question:

1/4-27 UNF threading?

NPT standards include the outside diameter (OD) of the bolt as a part of their specification. I.e. a 1/4 NPT threaded bolt is 0.540 inches in diameter, and a TPI of 18. However, when I look up ithe standards for 1/4 UNF, it simply talks about TPI and thread depth. It does not specify the outside diameter of the bolt. DOES THIS MEAN that the diameter of the bolt being threaded (and, thus, the internal diameter of the pipe being tapped for the bolt) is immaterial. I.e. a 0.5 ID and a 1 inch ID pipe could both have a 1/4-27 thread ?Thanks!

Answer:

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