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Garden Hose Thread (GHT / NH) (3/4"-11.5NH)

Where 3/4"-11.5NH is used, its real dimensions, and how to connect it to other standards.

3/4"-11.5NHThread standard
Designation3/4"-11.5NH
Major diameter26.99 mm
Threads per inch / pitch11.5
Thread formstraight (parallel), 60 degree
Seals onflat washer or O-ring in the female coupling

Used on: US and Canadian garden hoses, most hose-end accessories, many pressure-washer hose ends.

GHT is a coarse 11.5 TPI straight thread and is not interchangeable with the 14 TPI BSP thread used on UK outdoor taps, even though both are called 3/4 inch.

Quick-connect click fittings from Hozelock, Gardena and Karcher are proprietary and do not interchange. They all sit on top of a standard thread underneath, so the reliable way to move between brands is to adapt at the threaded tap or hose-end fitting, then use each brand's own connector above it.

Connect this thread

Connect to Caravan onboard 3/4 BSP water fittingneeds an adapterConnect Garden Hose Thread (GHT / NH) to 3/4" BSP parallel (G3/4 / BSPP)needs an adapterConnect Garden Hose Thread (GHT / NH) to 1/2" BSP parallel (G1/2 / BSPP)needs an adapterConnect Male aerator thread (M22 x 1 / 15/16"-27) to Garden Hose Thread (GHT / NH)needs an adapterConnect M22 x 1.5 pressure-washer, 15 mm bore to Garden Hose Thread (GHT / NH)needs an adapterConnect M22 x 1.5 pressure-washer, 14 mm bore to Garden Hose Thread (GHT / NH)needs an adapterConnect 3/4" NPT (National Pipe Taper) to Garden Hose Thread (GHT / NH)needs an adapterConnect 3/4" BSP tapered (R3/4 / BSPT) to Garden Hose Thread (GHT / NH)needs an adapterConnect 1/2" BSP tapered (R1/2 / BSPT) to Garden Hose Thread (GHT / NH)needs an adapterConnect 3/4" NPSH straight hose thread to Garden Hose Thread (GHT / NH)needs an adapter

Sources: ASME B1.20.7 (garden hose / GHT / NH threads) · NPSH / NH / NHR hose coupling thread table, Fittings.space