Question about outside taps, hose connectors and hoses

[bonzobanana]

Looking online I'm seeing conflicting information.

It seems garden hose is sold under its imperial bore size be it 1/2" or 3/4".

Then you have outside taps that are listed as 1/2" and 3/4" but does that refer to their connectors or the bore internally etc?

Then you have garden hose connectors often listed as 1/2" or 3/4" but the threads don't match that size they are larger.

Can someone bring clarity.

What is the outlet thread for a 1/2" tap and 3/4" tap?

Some 3/4" hose connectors have a thread that is close to 1".

Some quick connectors for hose are described as 1/2"

Anyone seem some decisive and clear information on all these connectors anywhere?

 

[TicklyT]

Pipe thread sizes refer to the bore of the (originally wrought iron) pipe the external thread is to be cut on.

As iron pipe had about 1/8" thick walls, a 1/2" bore pipe has about a 3/4" outside diameter, so a 1/2" pipe thread is about 3/4" diameter.

Likewise, a 3/4" thread is about 1" diameter.

 

[Charnwood]

Then you have outside taps that are listed as 1/2" and 3/4" but does that refer to their connectors or the bore internally etc?

The sizes refer to their 'incoming' connection in BSP:

View media item 41777

 

[bonzobanana]

So if you have a hose connector with a quick connector on one end and a internal female thread on the other side to connect to a tap that measures 0.96" thats actually meant for 1/2" tap not a 3/4" tap?

Where you have a tap connector on a hose which has 2 different internal size threads (a thread adapter screws into the other one to reduce its size) and the larger diameter thread is 1.21" internal diameter is that meant for a 3/4" tap? The smaller one is 0.96" internal diameter.

Are there mainly 2 size external taps sold in the uk?

The smallest tap adapter I can find is the one with 0.96" internal diameter where it screws on so assume this is meant for a 1/2" external tap as there doesn't seem anything smaller with regard tap connectors?

So would it be internal hose/pipe bore of 1/2" means the hose/pipe external diameter is about 3/4" which means to allow for the thread being on the outside of the metal on the tap connection takes it to 0.96"?

Am I making sense or have I missed something somewhere?

 

[swbjackson]

You can buy all sorts of sizes of bib taps starting at 1/2". Most domestic properties will use a 1/2" bib tap. Depending on the manufacturer the outlet can be various threads. Most seem to have a 3/4 MI thread but other sizes are still quite common. Most people will either use the adaptor supplied with the tap or go to a shed and buy one of the quick release adaptors with the adaptors. That's what I use if I want to get a water supply from an outside tap for flushing etc.

for the couple of quid that the adaptors cost it's not worth wasting time over.

 

[Charnwood]

Some brands of 1/2" bib tap will have a 3/4" BSP union for the hose. The actual diameter of a 3/4" male thread is a tad over 1”.
Some brands of 1/2" and most - if not all – 3/4" will have b@stard size, manufacturer-specific threads.

What are you measuring to come up with 0.96”, is it a female threaded nut?
The inside diameter of a 3/4" BSP nut will be a tad UNDER an inch. It looks odd, a less-than 1” female fitting on a more than 1” male, but it’s all to do with the peaks and troughs of the threads.

 

[bonzobanana]

0.96" is the internal diameter of the tap adapter where the thread is.

So do any 1/2" taps come with an outlet that is less than 3/4" I assume none do as there doesn't seem to be a tap adapter designed for less than 3/4".

One question if you have a hose/pipe bore 1/2" and you then add the thickness of the pipe/hose which takes it just over 3/4" and then the outlet has to have the thickness of its own material above this how does the bsp figure factor this in.

Is 1/2" bore pipe/hose always used with 3/4" bsp connectors which in themselves are actually closer to 1"(0.96) with regard their thread diameter.

I'm trying to get a full understanding of this as there doesn't seem to be information online that full explains how pipe bores and threads relate.

 

[Charnwood]

0.96" is the internal diameter of the tap adapter where the thread is.

Amost certainly 3/4" BSP.

So do any 1/2" taps come with an outlet that is less than 3/4".

Pegler used to, IIRC, but now both their 1/2" and 3/4" HU bib taps are 3/4" BSP.

 

[FiremanT]

A lot of this discussion is pointless. As said you nearly always use a 1/2" tap. (as on Charnwoods photo). That is 1/2"BSP to connect to mains. (Few normal houses have a cold supply around the house greater than 15mm/12")

The outlet is nearly always 3/4" BSP. They normally come with an adaptor for 1/2 hose, and you simply push the hose on and tighten with a hose clip.

Alternatively you dispose of the supplied adaptor, buy a hozelock type adaptor, and use a push fit connection:
http://www.youtube.com/watch?v=8b0_rMEUgIM

Why do you need all the details?