So for instance an adapter/coupler can be male/male, male/female, female/female, male/quick connect or female/quick connect. There's also more flexibility in the gender of fittings to allow mixing and matching of hoses and accessories to other hose systems. Quick connect adapters can also be screwed to the bibcock, spray nozzle or either or both ends of the hose to make the system push fit. The other end of the hose that connects to the spray head has a 3/4" male threaded fitting. In the US, typically a 3/4" female threaded fitting is crimped to the end of the hose that connects to the bibcock, allowing it to be simply screwed on. Types of Fittings on the End of US and UK Hosesįittings differ somewhat between the United States and the United Kingdom. Usually hose goes by the internal diameter, but sometimes external diameter is quoted. A 3/4-inch ID hose is generally reserved for professional use, the greater internal diameter resulting in less pressure drop over distance and a higher flow rate for the same pressure at the source.What Are the Internal Diameters of Garden Hoses? Pipes historically would have had a thicker wall and 1/2" would have been the inside measurement of the pipe. For instance a 1/2" BSP thread has an external diameter of about 21 mm or 53/64", whereas 1/2" is approximately equal to 12.5 mm. Thread sizes historically referenced the internal diameter of a steel or copper plumbing pipe that was used with the fitting. No, it's neither the internal nor external diameter. Domestic plumbing fittings vary in diameter, but also have BSP threads.ĭoes thread size refer to the actual diameter of the thread?.Taps used on farms, factories and in horticulture, and fittings for garden irrigation pumps often have a 1 inch or 7/8" BSP outlet.BSPP is used for garden hoses (but usually just referred to as "BSP".) Most garden taps have a 3/4 inch BSP thread and thread pitch is 14 threads per inch.The British Standard Pipe Thread standard (BSP) is used.The 3/4" connector has 14 threads per inch and is not compatible with spigots. Some hoses may be fitted with an NPSH (National Pipe Straight Hose) female, parallel threaded connector for connecting to a tapered threaded fitting on a water supply pipe (i.e.NPT threads however are used on the section of a bibcock that connects to the plumbing that feeds it. GHT is not compatible with National Pipe Tapered (NPT) as used for plumbing fittings.A 3/4 inch GHT fitting is suitable for hoses with an internal diameter of 1/2", 5/8" or 3/4". Fittings have an external thread diameter of 1 1/ 16", with a thread pitch of 11.5 threads per inch (TPI).Unlike tapered threads which wedge together when tightened, parallel threads don't seal without PTFE tape so usually rubber washers or o-rings are used in fittings to stop them leaking. Threads are non-tapered, i.e parallel.Male threads for garden hoses are also abbreviated as MHT for "male hose thread" and female threads as FHT for "female hose thread". NHR is for thin-walled couplers on hoses formed from rolled, thin material and NH is for full-form threads cut into thicker material, typically used for bib cocks and female hose ends. The standard thread used for garden hoses is commonly known as garden hose thread (GHT), but officially its title is NH ("National Hose") defined in ANSI B1.20.7.What Is the Thread Size of Garden Hose Fittings? The United States, its territories and Canada:
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