🔍 Key Concepts

• NPT (National Pipe Taper) standards in the U.S. • How pipe threads are designed to seal under pressure • Differences between machine screw threads and pipe threads

💭 Think About

• Think about how threaded pipe joints prevent leaks without always needing gaskets. • Consider whether a perfectly straight thread would help or hurt the ability to seal as the joint is tightened. • Ask yourself which features of taps and dies are typical for cutting pipe threads found in plumbing and fuel systems.

✅ Before You Answer

• Verify how standard U.S. pipe threads (NPT) are described in reference materials. • Check whether sealing relies on thread deformation/metal-to-metal contact or only on a gasket. • Confirm which option matches the usual description of U.S. pipe thread form used with taps and dies.