A standard garden hose fitting in the United States uses ¾-inch Garden Hose Thread (GHT), a straight thread with 11.5 threads per inch that seals with a rubber washer rather than by taper interference.
If you’ve ever tried to connect a hose to a spigot and felt that first moment of doubt — is this the right size? — you’re not alone. The simple answer is that nearly every residential hose, faucet, and sprinkler in the U.S. uses the same thread standard: ¾″ GHT, also called NH (National Hose). The “¾ inch” in the name is nominal, not a direct measurement of the thread’s width. The actual outside diameter of the male thread is about 1.0625 inches (roughly 27 mm), and the thread pitch is 11.5 threads per inch (TPI). That’s the number you actually need when checking compatibility. This standard is formalized in ANSI B1.20.7 and applies across the U.S., Canada, and U.S. territories. It covers residential and commercial garden hoses, outdoor faucets, sprinklers, and most hose accessories you’ll find at any hardware store. If you are buying new fittings or a replacement hose, look for the label ¾″ GHT or NH on the package — that is your guarantee of fit. When you are ready to pick up new connectors or repair parts, our tested roundup of the best garden hose fittings breaks down which ones hold up best in real use.
Why ¾″ GHT Isn’t a ¾″ Diameter Thread
The most common mistake people make is assuming the “¾ inch” label means the male thread measures 0.75 inches across. It does not. The ¾″ in GHT refers to the nominal hose inside diameter the thread was historically designed to work with — not the thread itself. The actual male thread outside diameter is about 1.0625 inches. A pipe thread (NPT) labeled ¾″ is physically smaller and has a different taper, so the two are not interchangeable without an adapter. Garden hose threads are straight (parallel), not tapered, which means they depend entirely on a flat rubber or silicone washer inside the female coupling to create a watertight seal. If that washer is missing, dry, or cracked, even a perfect thread match will leak. Always inspect the washer before tightening — it is the single most common failure point on a good connection.
How to Identify Whether a Fitting Is Standard GHT
If you have a fitting in hand and you are unsure whether it uses the standard ¾″ GHT or something else, three quick checks will tell you. First, measure the outside diameter of the male thread with a ruler or caliper: a standard GHT male measures about 1.06 inches (27 mm). Second, count the threads over exactly one inch: standard GHT has 11.5 threads per inch — this is a very fine, dense thread pattern. If the thread count is noticeably coarser or the diameter is substantially different, you may be looking at an NPT (pipe thread) or an import thread. Third, look for the rubber washer inside the female end: GHT connections always use a flat washer inside the female coupling, while NPT does not use a washer because it seals via thread taper. If the connection has no washer and the thread feels like it binds early, stop — forcing it can cross-thread and ruin both the hose and the spigot. A cheap thread gauge or a simple known-good male connector from a hardware store makes verification much easier. You can also check the hose or spigot itself for stamped markings: many quality fixtures have “¾″ GHT” or “NH” stamped into the brass or plastic.
The Difference Between Hose Diameter and Thread Size
This is where most confusion happens. A hose’s water flow size (its inside diameter) and its thread size (the fitting at both ends) are two completely separate specifications. You can buy a hose labeled ½″, ⅝″, or ¾″ inside diameter — all three will almost certainly use the same standard ¾″ GHT connection at the ends for residential use. The hose diameter determines how much water volume flows through it; the thread diameter is a fixed coupling standard. A ⅝″ hose is the most common residential size and still uses a ¾″ GHT fitting at both ends. If you are replacing a hose, you do not need to match the thread to the hose size — just buy the standard ¾″ GHT fitting and it will work. The rare exception is specialty heavy-duty or commercial hoses that sometimes use a 1″ GHT or 1¼″ GHT, but those are uncommon and will be clearly labeled on the package.
FAQs
FAQs
Can I connect a standard garden hose to a ¾-inch NPT pipe?
Not directly. NPT (National Pipe Taper) threads are tapered and seal by thread interference, while GHT threads are straight and seal with a washer. Forcing them together will cross-thread and leak. Use a brass or nylon GHT-to-NPT adapter, available at any hardware store, to make the connection properly.
Does every outdoor faucet in the U.S. use standard ¾″ GHT?
Nearly all residential outdoor faucets in the U.S. and Canada do. A small number of very old homes or commercial buildings may use 1″ GHT or even NPT spigots, but this is rare. Check the thread diameter and washer presence to confirm. If the spigot has no washer and the male threads feel rough, it may be NPT.
What does NH mean on a hose fitting?
NH stands for National Hose thread. It is the industry standard designation for what most people call garden hose thread (GHT). NH and GHT are the same thing: ¾″ straight thread with 11.5 TPI and a washer seal. NHR (National Hose, Regular) is also sometimes used and refers to the same standard.
References & Sources
- Wikipedia. “Garden hose.” Covers the ¾″ GHT standard, thread pitch (11.5 TPI), nominal vs. actual dimensions, and the distinction between GHT and NPT.