What thread is a garden hose?
Table of Contents
A garden hose usually uses a special thread standard called GHT (Garden Hose Thread) in North America. It is different from plumbing pipe threads like NPT or BSP, which is why fittings sometimes look like they should fit — but leak or won’t screw on correctly.
North America (USA & Canada)
The standard is:
- GHT = Garden Hose Thread
- Also called:
- NH = National Hose
- MHT = Male Hose Thread
- FHT = Female Hose Thread
The most common size is:
| Specification | Value |
|---|---|
| Thread Size | 3/4 inch |
| Threads Per Inch | 11.5 TPI |
| Thread Type | Straight / Parallel |
| Seal Method | Rubber washer |
Officially, the thread is usually written as:
3/4 in −11.5NH
This means:
- 3/4-inch nominal size
- 11.5 threads per inch
- NH (National Hose) standard
Important: Garden Hose Threads Are NOT Pipe Threads
Many people confuse:
- GHT
- NPT
- BSP
But they are different systems.
Quick Comparison
| Feature | GHT | NPT | BSP |
|---|---|---|---|
| Full Name | Garden Hose Thread | National Pipe Thread | British Standard Pipe |
| Thread Shape | Straight | Tapered | Straight or tapered |
| Seal Type | Rubber washer | Thread sealant/tape | Washer or thread seal |
| Common Use | Garden hoses | Plumbing | European plumbing |
| Region | USA/Canada | USA | Europe/UK |
| Compatible With GHT? | Yes | No | No |
How GHT Seals
Unlike plumbing threads, GHT does not seal through the threads themselves.
Instead:
- the threads only hold the connection together
- a rubber washer inside the female connector creates the watertight seal
That’s why:
- you usually tighten a garden hose by hand
- adding Teflon tape usually doesn’t help leaks
- missing washers cause dripping instantly
Male vs Female Hose Threads
Male Hose Thread (MHT)
- External threads
- Usually found on:
- outdoor faucets
- spray nozzles
- sprinklers
Female Hose Thread (FHT)
- Internal threads
- Usually found on:
- hose ends
- timers
- splitters
Why Adapters Are Often Needed
A garden hose won’t directly fit many plumbing fittings because:
- GHT is straight
- NPT is tapered
- BSP has different pitch and angle
Common adapters:
- GHT → NPT
- GHT → BSP
- GHT → quick connect
Without the correct adapter:
- leaks happen
- threads can strip
- fittings may get stuck
Europe & UK Garden Hose Threads
Outside North America, many hoses use:
BSP (British Standard Pipe)
Typical size:
3/4 in BSP =14TPI
Key difference:
- GHT = 11.5 TPI
- BSP = 14 TPI
Even though they look similar, they are not compatible.
How to Identify a Garden Hose Thread
Signs it is GHT
- Rubber washer inside female fitting
- 3/4-inch connection
- Straight threads
- Used for outdoor watering equipment
Signs it is NPT
- No washer
- Tapered threads
- Needs Teflon tape
- Used in plumbing
Common Garden Hose Thread Sizes
| Hose Size | Typical Thread |
|---|---|
| 1/2-inch hose | 3/4-inch GHT |
| 5/8-inch hose | 3/4-inch GHT |
| 3/4-inch hose | 3/4-inch GHT |
Interestingly, most residential hoses use the same 3/4-inch connector regardless of hose diameter.
Common Problems
Hose leaks at connection
Usually caused by:
- missing washer
- cracked washer
- cross-threading
Hose won’t screw on
Often due to:
- GHT vs NPT mismatch
- GHT vs BSP mismatch
- damaged threads
Connection sprays water sideways
Usually:
- overtightened fitting
- stripped plastic connector
- dirty washer surface
Final Verdict
Garden hoses mainly use:
- GHT / NH threads in North America
- BSP threads in Europe and the UK
The biggest thing to remember:
- garden hose threads are usually straight
- plumbing pipe threads are usually tapered
- they are not interchangeable without adapters
If you’re connecting a hose to plumbing, pressure washers, RV systems, irrigation, or filters, always check:
- thread type
- TPI (threads per inch)
- whether the fitting seals with a washer or thread tape.
FAQs
What thread size is a standard garden hose?
Most residential garden hoses in the United States and Canada use:
3/4 in −11.5GHT
This means:
3/4-inch nominal thread size
11.5 threads per inch
Garden Hose Thread standard
Even many 1/2-inch and 5/8-inch hoses still use the same connector size.
Are garden hose threads universal?
Mostly — but only within the same region.
USA/Canada
Usually use:
GHT
NH
Europe/UK
Usually use:
BSP
The two systems look similar but are not fully compatible.
Why does my hose leak even when tight?
Usually because:
the rubber washer is missing
the washer is cracked
dirt is stuck inside the fitting
the threads are cross-threaded
In many cases, replacing a cheap rubber washer fixes the problem instantly.
Do I need Teflon tape on garden hose threads?
Usually no.
Garden hose fittings seal using a rubber washer, not the threads themselves.
Teflon tape may help slightly on worn fittings, but it is normally unnecessary.
READ ALSO: How to Wash a Car Without a Hose?