Pipe fittings, commonly referred to as male pipe threads or NPT threads, play a crucial role in connecting pipes. Let’s delve into what they are and how to measure them.
What are NPT Threads?
NPT, which stands for National Pipe Taper, is a U.S. standard for tapered threads that has been in use for over a century. The uniqueness of NPT connections lies in their design: they rely on thread deformation. This means that the threads of the connectors meld together, creating a metal-to-metal seal.
How to Measure NPT Threads?
When it comes to measuring NPT threads, there’s a simple rule to follow: subtract ¼-inch from your initial measurement. Remember, the wall thickness of the pipe can vary, so it’s essential to consider that.
Example: If you’re measuring a ¼ inch male pipe thread (MPT), start by measuring the outermost edges of the thread. Then, subtract ¼ inch from the outside diameter (OD) measurement. This subtraction accounts for the pipe wall’s thickness on both sides. For female pipe threads (FPT), measure the pipe’s OD and then subtract ¼ inch to determine the correct thread size.
Tools to Make the Job Easier
For those who want a straightforward method, investing in a caliper can be a game-changer. This tool can measure both the outside diameter (OD) and inside diameter (ID) with precision. Companies like QC Hydraulics even offer specialized tools like angle gauge calipers and thread pitch gauges for added convenience.
Quick Reference for NPT Measurements:
For more details on various pipe threads, consider checking out the comprehensive reference guide from Hydraxio.
In essence, understanding and measuring NPT threads is straightforward once you know the basics. Whether you’re a professional or a DIY enthusiast, the right knowledge and tools can make all the difference.
