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I am building a garden irrigation system which is directly connected to a tap. In Europe the garden taps are usually BSP 3/4" (http://en.wikipedia.org/wiki/British_Standard_Pipe). It would be great to have it compatible to the US, therefore I am wondering if you use the same system or what is a standard garden tap thread over there?

Any clues or just stating what you have in your garden would be great!

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In the U.S. the standard is simply called Garden Hose Thread or GHT,. It's a 3/4" straight thread with a coarse thread pitch and is not compatible with the BSP which is a finer thread pitch.enter image description here

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  • Thanks a lot! For design purposes I would need: minor/major diameter of the thread for the internal and external threads respectively, ideally also tolerances for all 4 values... Could you guide me where to find that?
    – SCBuergel
    Jun 7, 2015 at 17:23
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The US uses 3/4" straight thread, with 11.5 threads per inch according to Wikipedia

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http://catalog.tapcotaps.com/item/all-categories/popular-special-taps-right-hand-/72518 From Tapco taps. The reason no one can find GHT taps.. is because that's the thread name.. the TAP name is National Hose Thread 3/4 11 1/2 NH The link is for the Best.. too expensive, buy one from china. Remember that it's a meaty 3/4" hand tap so breaking it will be horrifying, buy a good one .. :)

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