![]() ![]() These threads create a seal through metal-to-metal wedging or slight deformation of the threads. NPT/NPTF, BSPT, and Metric Tapered are examples of tapered threads. If the measurements decrease in size, then it’s tapered. ![]() If the measurements are all the same, then it’s parallel. Use the caliper to measure the first, fourth, and final full thread. Sometimes this characteristic can be determined through visual inspection, but if not a caliper can come in handy. Tapered threads become narrower as they extend outward while parallel threads remain the same diameter. Next, determine if the thread is tapered or parallel. It simply serves as a way to distinguish between the two connections. The gender of the thread doesn’t necessarily have an impact on the functionality of the thread. If they’re on the inside of the thread, it’s a female thread. If they’re on the outside of the thread, it’s a male thread. Take a look at where the threads are located. Female Threadsįirst, you’ll need to identify whether the thread type is male or female. How to Identify Different Types of Threads Step 1 – Male Threads v. If you’re looking to buy a thread pitch gauge, Grainger has a pretty good selection. ![]() For metric threads, this tool measures the distance between the threads. However, if you think you’ll be using one quite often, here’s a digital caliper we found on Amazon for a reasonable price.Ī pitch gauge measures the threads per inch. Using a caliper will give you the most accurate and precise measurements, but a straight steel ruler is a good alternative. Thread Identifying Tools You Need Caliper –Ī caliper is a useful tool that measures the outside diameter of a male thread and inside diameter of a female thread. Table of Contents: Tools You’ll Need NPT/NPTF Thread Type Chart BSP Thread Type Chart PT Thread Type Chart SAE Thread Type Chart Metric Thread Type Chart Thread Seal Tape and Alternative Solutions We also encourage you to download this Thread Identification Guide for future reference because it will certainly come in handy. You’ll need a couple tools on hand to make the process easier, but a straight steel ruler may work as well. In addition, we’ll cover some of the most common port thread types including NPT/NPTF, BSPP (also known as G), BSPT, PT, Metric (M) and SAE. We have compiled a simple step-by-step guide to help you identify your thread type. For example, G threads are not compatible NPT threads because of their differing angles, shapes, and thread pitches (threads per inch). But take a closer look and you’ll notice the very subtle differences that would make them incompatible with one another. Choosing the correct thread type will ensure optimum compatibility with your equipment. For example, the pneumatic components we offer in our web store are available with either NPT, PT or G port threads. Pneumatic components such as air cylinders, valves, and air preparation units come equipped with specific port threads. It’s important to identify the specific thread type you need in order for your equipment to function at its best. Plus, learn when it’s okay to use thread seal tape for urgent situations. Below you’ll find a detailed guide on how to correctly identify the most popular thread types used in industrial components. You ask, “How do I find out what thread type I need?” Fortunately, we’ve got you covered. You call to check stock on the item and the sales rep asks you what thread type you need. So you finally found the right solenoid valve to replace your broken one. Authorized System Integrator for Fanuc America, Inc.The most common method used in production is by way of a go/no go gauge. Several methods are used to measure the pitch diameter. The pitch diameter is indicated as Dp in the figure shown above. Thread class refers to the acceptable range of pitch diameter for any given thread. Classes 1A, 2A, 3A apply to external threads Classes 1B, 2B, 3B apply to internal threads. ![]() The letter suffix "A" or "B" denotes whether the threads are external or internal, respectively. It is an interference thread, used on items like spring shackles on an automobile. They are designed to maximize strength considering typical machine shop capability and machine practice.Ĭlass 3 threads are used for closer tolerances.Ĭlass 4 thread fit is even tighter than a Class 3.Ĭlass 5 fit is not a loose thread. This system is analogous to the fits used with assembled parts.Ĭlass 1 threads are loosely fitting threads intended for ease of assembly or use in a dirty environment.Ĭlass 2 threads are the most common. Most (but certainly not all) threaded items are made to a classification standard called the Unified Screw Thread Standard Series. A classification system exists for ease of manufacture and interchangeability of fabricated threaded items. ![]()
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