What Is the Diameter of 3/8 NPT Pipe? | NPT Thread Size Explained
Learn the exact diameter of 3/8 NPT pipe and understand the basics of National Pipe Thread (NPT) standards for pipe fittings and connections.
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The diameter of 3/8 NPT pipe is nominally 0.675 inches (17.1mm) for the outside diameter. NPT, or National Pipe Thread, is a U.S. standard for tapered threads used to join pipes and fittings, which may differ from other thread standards.
FAQs & Answers
- What does 3/8 NPT mean? 3/8 NPT refers to a nominal pipe size with a National Pipe Thread standard, indicating tapered threads used for sealing pipe fittings, where 3/8 relates to the approximate pipe size.
- What is the outside diameter of a 3/8 NPT pipe? The outside diameter of a 3/8 NPT pipe is nominally 0.675 inches or 17.1 millimeters.
- How does NPT differ from other thread standards? NPT threads are tapered and primarily used in the U.S. for pipe sealing, whereas other standards like BSP use parallel threads or different taper angles.
- Can 3/8 NPT threads be used interchangeably with other thread types? No, NPT threads have specific taper and pitch that differ from other thread types, so they are generally not interchangeable without adapters.