f you’ve ever wondered what kind of thread your garden hose uses—especially when you’re trying to connect it to different devices like pressure washers, sprinklers, or nozzles—the answer is quite simple. Garden hoses in the U.S. use a standard thread size known as Garden Hose Thread (GHT), which is different from most other types of pipe threads. Let’s break it down.
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Standard Garden Hose Thread (GHT)
For garden hoses in the U.S., the standard thread is called Garden Hose Thread (GHT). The measurements and specifics are as follows:
- Outer diameter: 1 1/16 inches (27 mm)
- Thread pitch: 11.5 threads per inch (TPI)
This standard is used across most garden hoses and outdoor water connections like spigots, hose bibs, and watering accessories.
National Pipe Thread (NPT) vs. Garden Hose Thread (GHT)
Many people confuse National Pipe Thread (NPT), which is commonly used for plumbing, with GHT. Here’s how they differ:
| Thread Type | Diameter (OD) | Threads per Inch (TPI) | Usage |
|---|---|---|---|
| Garden Hose Thread (GHT) | 1 1/16 inches (27 mm) | 11.5 TPI | Garden hoses, outdoor spigots |
| National Pipe Thread (NPT) | Varies by pipe size | 14-27 TPI depending on size | Plumbing pipes and fittings |
NPT threads have a tapered design for tighter, leak-free seals in plumbing systems, while GHT threads are straight, designed for connections that use rubber washers to prevent leaks.
Connecting GHT to NPT
If you’re trying to connect a garden hose to something that uses NPT threads, you’ll need a thread adapter. These adapters allow you to connect the two incompatible thread types easily.
Conclusion
In summary, garden hoses use GHT (Garden Hose Thread) with a size of 1 1/16 inches in diameter and 11.5 TPI. It’s important to note the difference between GHT and NPT to ensure you’re using the correct fittings and adapters for your connections.