What Size Threads Are On A Garden Hose?

When it comes to the size of threads on garden hoses, there are many factors to consider. Depending on the appliance one is attaching to the garden hose, or the purpose of the garden hose, the size of the threads can vary. To help make the size of thread easier to understand, let's take a closer look.

Thread Identifiers

When referring to thread sizes, there are two types of identifiers the National Pipe Thread (NPT) and the Garden Hose Thread (GHT). The NPT thread is commonly referred to as a straight thread and the GHT thread is somewhat like a tapered thread.

The NPT Standard

The NPT thread standard is recognized by the American National Standard Pipe Thread System (ANSI/ASME B1.20.1). This thread system applies to all straight threads and should be installed at a given sealant and torque. The typical NPT thread size for a garden hose is 1/2.

GHT Thread Standard

The GHT thread standard is recognized by the American National Standard for Garden Hose Threads (ANSI/ASME B1.20.7). A GHT thread is a tapered thread with a 3/4" male end and a 5/8" female end. The GHT thread has slightly different measurements for the male and female ends so they can seal properly. To distinguish it from the NPT thread, the GHT thread has slightly wider peaks and valleys.

Materials

The majority of garden hoses are made from brass, plastic, or aluminum. Brass and aluminum hoses are typically more durable and typically have higher pressure ratings than plastic. All three materials tend to use the GHT thread type due to the wide range of pressure ratings they offer.

Connectors

The connector type will also affect the size of the threads used. Most garden hoses use standard couplings, but there are some specialty fittings that may use larger or smaller threads. Additionally, quick connect fittings may require a different type of thread than a standard coupling.

Pressure and Temperature Rating

The pressure and temperature ratings of the garden hose will also determine the size of the thread used. For higher pressure ratings, such as those used for pressure washers or industrial applications, a larger thread size may be necessary. Higher temperature ratings may also require a larger thread size as well.

Duration

The duration of pressure and temperature also must be taken into consideration when determining the size of the thread. A longer duration may require a larger thread size to ensure the connection is secure.

In Summary

The size of the thread used on a garden hose is dependent on many factors. The thread type used, the material of the hose, the fitting type, the pressure and temperature rating and the duration all affect the size of the thread used. To ensure a proper connection, use the information provided in this article to determine the proper size thread for your project.