IPS Vs NPT is an important topic related to plumbing that can make or break a project. From understanding the differences between IPS and NPT pipes to choosing the right one for your application, this exciting guide will walk you through every step of the process! With so much information at stake, it’s essential that you understand which type of pipe is best suited for your needs in order to get the most out of your project.

IPS (Iron Pipe Size) and NPT (National Pipe Thread) are two different types of pipe thread. IPS pipes are larger than NPT, with diameters ranging from 1/8 inch to 8 inches. The threads on IPS pipes come in a variety of sizes, ranging from 11-1/2 threads per inch for the smallest size up to 4 threads per inch for the largest size. On the other hand, NPT is a standard American tapered thread used primarily in plumbing applications; it has 2-3/8” threads per inch and comes in various diameters between 1/8” and 6”.

IPS Vs NPT: Overview

IPS (Iron Pipe Size) and NPT (National Pipe Thread) are two different types of pipe thread used for plumbing, irrigation systems, hydraulic applications, and more. While IPS is predominantly used in North America, NPT has become the standard for international markets due to its superior sealing performance.

IPS threads have a straight thread form with a flat crest and root profile while the NPT threads feature tapered crests and roots that allow them to be threaded together easily. This also makes them ideal for creating tight seals when used with an appropriate sealant like teflon tape or pipe dope. Additionally, NPT is designed to provide greater tensile strength compared to IPS which results in increased resistance against pressure build-up and potential temperature fluctuations over time.

Finally, it’s important to note that while both IPS and NPT can produce secure connections depending on their application – they cannot typically be mixed-and-matched as doing so could cause leaks or other issues if done incorrectly. As such it’s critical to ensure you’re using the correct type of pipe thread for each job in order to guarantee optimal performance

Advantages of IPS Threads

IPS (Iron Pipe Size) threads are a type of threaded joint that offers several advantages over NPT (National Pipe Thread). IPS threads offer:

1. Greater strength and durability – IPS threads use tapered threading in both the male and female ends to ensure tight seals, which reduces leakage risks. This also makes the connection stronger than NPT connections, making it more resistant to vibration fatigue.

2. Easier installation – Due to their design, IPS connections require less torque for tightening than NPT connections do, making them much easier to install quickly and accurately with fewer tools required.

3. Less sealant needed – Because of the tighter fits between male and female connectors found on IPS fittings, less sealant is needed for each connection compared with NPT-threaded joints; this makes for faster installations as well as cost savings from using less material overall.

Disadvantages of IPS Threads

IPS threads are an important component in connecting pipes and fittings, but they also have some drawbacks compared to their NPT counterparts. Below is a list of the main disadvantages of IPS threads:

1. Poor Strength – The strength of the connection is not as high as that of NPT threading, making them more prone to loosening or breaking under pressure or vibration.

2. Limited Versatility – While most common pipe and fitting sizes can be threaded with IPS, they are less popular than NPT so certain fittings might only be available from limited sources.

3. More Expensive – Due to their lower popularity and demand, IPS threads tend to cost more than comparably sized NPT products which may affect project budgets for those who use them regularly.

Advantages & Disadvantages of NPT Threads

NPT threads are a type of thread used in piping systems and they offer many advantages over IPS (Iron Pipe Size) threads. NPT threads have an advantage over IPS because they can be sealed without the use of additional components like gaskets or tape. This not only reduces cost but also makes them easier to install as there is no need for extra parts or specialized tools. Additionally, NPT threads are self-tapping which means that they can be used on both metal and plastic pipes, something that cannot be said for IPS.

On the downside, NPT threads require more care when being installed due to their taper lock design which can create weak points in the joint if it is not done correctly. Further, since these types of fittings rely on pressure to form a seal, any leaks will require disassembly and rethreading before being resealed again; this adds time and expense to the job. Finally, while NPT provides better sealing than IPS due to its geometry and material characteristics, you may still experience some leakage depending on your application’s specific needs.


In conclusion, IPS and NPT are two of the most widely used pipe thread options available. Each has its own unique benefits and drawbacks that should be taken into consideration when choosing which type of pipe thread to use for a particular application. IPS is generally recommended for applications where pressure or temperature fluctuations may occur as it offers superior sealing capabilities compared to NPT threads. On the other hand, NPT threads provide better temperature regulation than IPS due to their tapered design, making them ideal for low-pressure systems such as plumbing fixtures. Ultimately, what type of pipe threading one chooses depends on the specific requirements and conditions of their application.

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