M22 x 1.5 pressure-washer, 15 mm bore (M22 x 1.5 (15 mm))
Where M22 x 1.5 (15 mm) is used, its real dimensions, and how to connect it to other standards.
M22 x 1.5 (15 mm)Thread standard
DesignationM22 x 1.5 (15 mm)
Major diameter22.0 mm
Threads per inch / pitch1.5 mm pitch
Thread formparallel, metric
Seals onO-ring on the 15 mm spigot
Used on: Nilfisk, many Bosch, and most non-Karcher consumer pressure washers.
Same M22 x 1.5 external thread as the 14 mm version but a larger 15 mm bore. A 14-to-15 mm adapter or the correct O-ring is needed to swap accessories between the two.
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 M22 x 1.5 pressure-washer, 14 mm bore to M22 x 1.5 pressure-washer, 15 mm boreneeds 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, 15 mm bore to 3/4" BSP parallel (G3/4 / BSPP)needs an adapterConnect M22 x 1.5 pressure-washer, 15 mm bore to 3/8" NPT (National Pipe Taper)needs an adapterM22 x 1.5 pressure-washer, 14 mm borerelated standard (M22 x 1.5 (14 mm))
Sources: Pressure-washer M22 14mm vs 15mm fitting data (M MINGLE spec)