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Do you have Locknuts for the fittings with NPT (national pipe threads)?

No, we do not. No one makes a nut for male NPT because it is a tapered thread designed to make liquid-tight seals when threaded into a female NPT fitting. They are tapered so that the further you thread it, the tighter the threads become. This type of thread does not allow you to thread them all the way in; if tightened too tight, the threads will crack. They should be hand-tightened and then another 1/4 turn.

They only make locknuts for straight threads that allow the nut to thread all the way down the length of the thread. Click here to see the fittings that we offer that are available with locknuts.

Title: Do you have Locknuts for the fittings with NPT (national pipe threads)?
Description: Why you can't use a locknut on National Pipe Thread.
Published: 5/23/2008
Last Edited: 12/29/2022
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