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National pipe thread
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=== Thread form === National Pipe Thread series have the same 60Β° included angle as [[Screw thread#History of standardization|Sellers thread]]. On the other hand, for sealing capability, tapered (pressure-tight) threads have crest and root shapes that differ from Sellers. For example, the NPT has a crest width of 0.038 to 0.062 pitch, which is sharper than the 0.125 pitch of Sellers. <ref name="B1.20.1"/>
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