Use a sealant on the threads before placing the NPT for assembly. Pipe threads are the leakiest style of connections and are not generally used in high-pressure systems.NPT threads are mainly used in hydraulic systems despite being initially designed for water pipe plumbing (60 psi).NPT threads may have some leakage issues associated with them. Threads per inch (TPI) is the unit used to measure the pitch.The thread angle is exactly sixty degrees.The crests and roots have a flat truncation.The center axis and taper of the pipe have an angle of 1° 47′ 24″ (1.7800°) between them.Unfortunately, this also means their sizing requires a lot of care. There are certain characteristics of NPT threads that make them very unique and helpful. This video has more information on the uses of NPT threads. The tapered nature of NPT threads allows them to be used as a seal to generate torque when pressed on flanks. Tapered pipes can be used for several purposes, like effectively sealing materials used for transporting solids, liquids, or gases. The NPT series contains variously tapered and straight thread series and has standards for testing various parameters like rigidity or pressure-tight sealing, or both. This is the abbreviated version of American Nation Standard Pipe Thread. Now that you know how to size a drill bit, it is good to know some details about National Piper Thread or NPT.If the fit is tight enough, you are good to go. To be sure, put the bit inside the sample hole and check the fit.Measure the depth of these holes and tally them with the size of the drill bit. To ensure the drill bit size is perfect, make some sample holes in a thin metallic sheet.Step 3: Test The HoleĮven if you have bought a new drill bit or sized an old one using calipers, you would not want to have an imperfect drill due to improper sizing. It is essential for measuring the drill bit’s size. Don’t place the body of the screw between the jaws.Ĭalipers are easily available in any local home supply store. Place the body of the screw between the jaws and then press them with your fingers to hold the screw in place. It’s a simple machine and an easily usable one. They look like a flat and small handle with two jaws on the top. The diameter of the screw is measured from the outer thread of one side to the outer thread of the other side. The diameter is usually written infractions. You will find the drill bit diameter stamped near the markings. There are markings on the shank of the drill bit above the thread. With the correct drill bit chosen, lets go through each of the steps involved in using your 1/8″ NPT Tap.
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