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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.
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What Is the Thread Size of Garden Hose Fittings? The United States, its territories and Canada: