What Size Threads On A Garden Hose: 2026 Sizing Guide

Most garden hoses use 3/4-inch GHT (NH) with 11.5 threads per inch.

If you have ever fought a leak at the spigot or stripped a connector, you know thread size matters. In this guide, I explain what size threads on a garden hose are, how they differ from pipe threads, and how to match fittings with zero guesswork. I work with irrigation parts and home plumbing daily, so you will get clear, field-tested tips and accurate standards that end leaks and returns.

What size threads on a garden hose explained

In the United States, the standard garden hose thread is 3/4-11.5 NH, often called 3/4-inch GHT. NH stands for National Hose, and it is a straight thread. The seal comes from a flat washer, not the threads.

Most hoses, nozzles, and spigots sold for yard use follow this size. That includes 1/2-inch, 5/8-inch, and 3/4-inch hose inner diameters. The hose ID does not change the coupling thread. When people ask what size threads on a garden hose, this 3/4-11.5 GHT answer covers 99% of US yards.

A quick view of the parts:

• Outdoor faucet or sillcock: male 3/4-11.5 GHT.
• Hose end that attaches to faucet: female swivel 3/4-11.5 GHT with a washer.
• Tool end of hose: male 3/4-11.5 GHT for nozzles, sprinklers, and timers.

If you are searching what size threads on a garden hose for your setup, start by assuming 3/4-11.5 GHT, then verify with the checks below.

GHT vs NPT vs BSP: why the difference matters

Not all threads are the same. Mixing types causes leaks, cross-threading, and damage.

• GHT or NH (3/4-11.5)

  • Straight thread. Flat washer seals. Standard for US garden hoses.
  • Major diameter is about 1.0625 inches on the male thread.
  • Defined by ANSI/ASME standards for hose coupling threads.

• NPT (National Pipe Taper)

  • Tapered thread. Seals on the threads. Needs PTFE tape or pipe dope.
  • Common sizes near outdoor plumbing are 1/2 NPT and 3/4 NPT.
  • Used on pipe fittings, not on hose ends.

• BSP (British Standard Pipe), often in EU/UK/AU

  • BSPP is parallel. BSPT is tapered.
  • Common tap adaptors are 1/2 BSP, 3/4 BSP, and 1 BSP.
  • Many European quick-connect systems attach to taps with BSP threads.

These are not cross-compatible without an adapter. When friends ask me what size threads on a garden hose will fit a pipe fitting, I tell them to use a GHT-to-NPT or GHT-to-BSP adapter rather than forcing a mix.

How to identify your hose thread size at home

You can confirm your thread in minutes with simple checks. No fancy tools needed.

• Look for markings

  • Packaging or cast markings often read 3/4-11.5 NH or 3/4 GHT.
  • Washing machine hoses in the US also use 3/4 GHT.

• Measure the outside of a male thread

  • Use a ruler. About 1-1/16 inches across signals 3/4 GHT.
  • If you see a clear taper and a smaller diameter away from the opening, it could be NPT.

• Count threads per inch

  • Lay a small ruler on the threads. You should see about 11.5 threads in one inch for GHT.
  • Pipe threads like 3/4 NPT have 14 TPI, and they taper.

• Check the seal method

  • If it uses a flat rubber washer and tightens until metal meets washer, it is likely GHT.
  • If it needs thread seal tape and tightens as threads wedge, it is likely NPT or BSPT.

• Try a known-good part

  • Test with a common garden nozzle or Y-splitter marked 3/4 GHT.
  • If it threads smoothly and seals with a washer, you have 3/4 GHT.

Use these steps any time you need to verify what size threads on a garden hose or a new spigot.

Adapters and compatibility for real-world setups

Many projects mix hose threads and pipe threads. Adapters make that easy and clean.

• GHT to NPT

  • For linking a hose to pipe fittings, pumps, filters, or irrigation manifolds.
  • Common adapters: 3/4 GHT female to 1/2 NPT male, 3/4 GHT female to 3/4 NPT male, and the reverse.

• GHT to BSP

  • Handy when importing parts or using EU-style taps. Look for 3/4 GHT to 3/4 BSPP parallel.

• Quick-connect sets

  • Many sets are built around 3/4 GHT male and female bodies.
  • They speed up swaps of nozzles, sprinklers, and pressure washers.

• Timers and filters

  • Hose timers, sediment filters, and backflow devices for yard use are usually 3/4 GHT.
  • Some pro irrigation parts are NPT and need a GHT adapter.

When you plan adapters, write down what size threads on a garden hose you have, and what the other device uses. Choose a single, labeled adapter to bridge the two.

Sealing tips, washers, and leak prevention

A straight GHT seal depends on the washer. Focus on this first.

• Use the right washer

  • Standard garden hose washers are about 1 inch outer diameter, about 5/8 inch inner diameter.
  • Use fresh rubber or EPDM washers. Replace cracked or flattened ones.

• Do not rely on thread tape for GHT

  • PTFE tape does little on GHT because the threads do not seal.
  • The washer does the sealing. Teflon tape is for NPT or other tapered threads.

• Hand-tight first, then a slight snug

  • Tighten by hand until the washer seats. Add a small nudge with pliers only if needed.
  • Over-tightening can crush the washer or crack plastic fittings.

• Keep threads clean and aligned

  • Dirt causes cross-threading. Start every connection by hand.
  • If it resists, back off and try again.

These small habits solve most leak reports I get about what size threads on a garden hose and how to seal them.

Real-world mistakes I have seen (and how to avoid them)

I once watched a neighbor force a 3/4 NPT fitting into a hose Y-splitter. It bound up, then snapped the splitter body. A five-dollar GHT-to-NPT adapter would have fixed it.

Common traps to avoid:

• Mixing NPT and GHT without an adapter. It feels close, then leaks or cracks.
• Reusing the same old washer “one more season.” It costs pennies. Replace it.
• Using thread tape on every joint. It masks bad matches. On GHT, it is not needed.
• Over-tightening brass on plastic. The plastic loses every time.
• Guessing under pressure. Write down what size threads on a garden hose you have before you shop.

Buying guide: hoses, nozzles, and fittings that match

Shop with a simple checklist to avoid returns and wasted time.

• Confirm standards

  • Look for 3/4-11.5 GHT or 3/4 NH on hoses, nozzles, timers, and Y-splitters.
  • For pipe parts, note NPT sizes and get a GHT adapter as needed.

• Choose durable materials

  • Brass threads last longer than plastic, especially on faucets.
  • For frequent swaps, use brass quick-connect couplers with 3/4 GHT.

• Stock spare washers

  • Keep a small pack in the garage. Replace at the first drip.

• Plan for region

  • In the US, GHT is standard. In many other countries, taps may be BSP.
  • If you move or import gear, check what size threads on a garden hose or tap you are using and match with adapters.

• Pressure and flow

  • A 5/8-inch hose ID is a good balance of flow and weight for most yards.
  • The ID does not change the coupling thread. It is still 3/4 GHT on the ends.

Frequently Asked Questions of what size threads on a garden hose

What is the standard garden hose thread size in the US?

It is 3/4-11.5 NH, also called 3/4-inch GHT. It is a straight thread that seals with a washer.

Are garden hose threads the same as NPT?

No. GHT is straight and seals with a washer. NPT is tapered and seals on the threads with tape or sealant.

Do 1/2-inch hoses have smaller threads?

No. Most consumer hoses, even 1/2-inch ID, still use 3/4 GHT on the ends. Hose ID and thread size are different things.

Do I need Teflon tape on garden hose threads?

Not for GHT-to-GHT joints. The washer makes the seal. Use tape only on NPT pipe threads.

What thread do washing machine hoses use in the US?

Most use 3/4 GHT, the same as garden hoses. They will screw onto a hose spigot.

How can I tell if a faucet is GHT or NPT?

Check the seal method and look for markings. GHT is straight and uses a washer; NPT tapers and needs thread sealant.

Will European hose fittings screw onto US spigots?

Often not without an adapter. Many EU taps are BSP, while US garden spigots are GHT.

Conclusion

You can solve thread confusion with one fact: a US garden hose uses 3/4-11.5 GHT, and it seals with a washer. From there, match any pipe or foreign fitting with a clear, labeled adapter. Measure once, buy once, and your yard gear will work without leaks.

Put this guide to work today. Check your washers, confirm your fittings, and note what size threads on a garden hose you own before your next project. If this helped, share it with a neighbor, subscribe for more DIY guides, or leave a question and I will help you sort your setup.