![]() The best place to start looking is the owner's manual.ĭon't worry if you can't locate the manual you may also find a tire fit guide in these locations: No matter what vehicle you drive, finding the manufacturer-recommended tire size should be easy. Knowing how to read car tire sizes also means understanding terms like load index and speed rating that affect your vehicle's overall capabilities. Learn more about pipe size and thread types from John.While actual, physical measurements like width and diameter are factors in finding the right tire size, there are additional details to consider. OD tubing is based on the outer diameter (the one you measure with a ruler) just like it sounds and fits into OD size tubing.ID tubing is based on the nominal size of the pipe rather than the actual measurement.If you measure the actual thread size of a 1/2 inch fitting, then it will not actually measure 1/2 of an inch, even though that's what the part says. If you buy a 1/2 inch thread and measure the diameter, it will measure over 1 inch because it's designed to have a nominal pipe fitting. The female fitting should be sized just as large as the male fitting to get the right fit. They're sized by the nominal size of the pipe, or the inner diameter. Threads are sized just like the CTS fittings. Measuring thread size may also be confusing. The most common CTS fittings are 1/2 inch, 3/4 inch, and larger sizes because they're used for household plumbing more frequently than ID nominal size parts. Smaller appliances, like under counter filters that run to your refrigerator or ice maker, use OD sized parts. OD fittingsĬTS is actually available all the way down to 1/4 inch, although it's not used frequently. The CTS pipe fits nicely into a 1/2 inch CTS fitting. But if you buy a 1/2 inch fitting designed for CTS (measured by ID) by mistake, then it won't fit properly. For example, a 1/2 OD push-to-connect fitting goes with a 1/2 inch OD tube. The size of OD tubing is typically marked in fine print on the side of the tube. If the tubing is sized by the OD, then you should look for fittings sized appropriately. ![]() Nominal pipe size is the measurement based on the inner diameter rather than the actual diameter. When you're planning the plumbing for a house or another building, you calculate how much flow rate you need through the inner diameter of the tube or the pipe. The fittings used with those pipes measure larger than their labeled size because they connect over the outside of a plumbing pipe. Shop All Tubing What is nominal pipe size? The ID size is referred to as CTS, which stands for copper tube size. CTS is based on the nominal size of a pipe. By the outer diameter (OD) for smaller fittings measuring 1/4, 3/8, or 1/2 inch.In our industry, pipes and tubing are sized in two ways: How to determine fitting size from pipe dimensions When they measure their pipe dimension, it reads 1-inch, but the 1-inch fitting ordered is too large and doesn't fit the pipe or tubing. John Woodard, our Master Water Specialist, explains nominal pipe size and how to find the right fittings based on pipe dimensions. People often call us confused when they're shopping for tubing or trying to size pipe fittings for tubing.
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