Table of Contents

NPT, PT, G are all pipe threads.

Navigating the labyrinth of pipes requires an understanding of NPT, PT, and G threads. Let’s explore the unique characteristics that make these threads indispensable globally.

NPT Thread

1. National Pipe Thread (NPT)

NPT, or National (American) Pipe Thread, is a widely used standard in North America. This 60-degree vertebral pipe thread plays a vital role in ensuring a tight connection.

NPT thread
NPT thread

PT Thread

Definition and common usage

2. Pipe Thread (PT) – BSPT

PT, or Pipe Thread, is a 55-degree sealed round vertebral pipe thread. Commonly known as BSPT (British Standard Pipe Taper), it finds extensive use in Europe and Commonwealth countries, especially in water and gas pipe industries.

PT thread
PT thread

G Thread

G Thread, a 55-degree non-threaded sealing pipe thread, belongs to the Wyeth thread family. Recognized by its cylindrical thread, we’ll discuss its unique features and applications.

Rc Thread

Rc threads, with conical internal designs, find specific applications in the industry where this unique structure is essential.


  1. What is the significance of the 60-degree angle in pipe threads?The 60-degree angle ensures a secure and tight connection between pipe threads, minimizing the risk of leaks.
  2. How does the nominal diameter relate to thread diameter in pipe threads?The nominal diameter represents the connected pipe’s diameter, which is larger than the thread diameter. For example, 1/4, 1/2, and 1/8 inches are common nominal diameters for inch threads.
  3. What are the primary applications of G threads in plumbing?G threads, known for their cylindrical nature, are commonly used in water pipe joints, providing a reliable sealing solution.
  4. Is there a standard for inch-sealed pipe threads?Yes, the ISO standard (ISO 7-2:2000) outlines the specifications for inch-sealed pipe threads, focusing on the “column/taper” fit system.
  5. Which countries predominantly use PT (BSPT) threads?PT threads, commonly known as BSPT, find extensive use in Europe and Commonwealth countries, particularly in the water and gas pipe industry.
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