To measure a hose fitting, measure the Inside Diameter (ID) of the hose to find the flow size, and use a tape measure or calipers to find the thread size and thread pitch of the actual fitting.
If the inner diameter is approximately 15.88 mm, it is a 5/8-inch hose—commonly used for home gardening or car washing. If the measurement is 19.05 mm, it is a 3/4-inch hose—typically used for large-scale garden irrigation or commercial applications.
Male garden hose threads are all 3/4" with an outside diameter of 1.0625 and 11-1/2" threads per inch.
All M22 connections found on gas units are 14mm. The 15mm M22 fittings are used only on select electric pressure washers. Therefore, it is important to ensure that if a gas unit is being used, 14mm M22 fittings are selected. The 3/8" threaded connections may look very similar to M22 fittings, but they are not the same.
19mm = 3/4 inch. 20mm = 25/32 inch. 21mm = just over 13/16 inch. 22mm = almost 7/8 inch.
Each dash size corresponds to a progressively larger diameter, measured in sixteenths of an inch. “-1” is 1/16", “-2” is 2/16", and so on. In this case, -6 hose would indicate a hose with an inside diameter of 6/16”, or 3/8".
Common Hose Diameters
Hose diameters range from 3/8 inch, 1/2 inch and 3/4 inch. The bigger the diameter, the more water is delivered. The most common garden hose thread size is 3/4 inch.
The pitch of M8 threads is 1.25mm. And, TPI (Threads Per Inch) of 5/16 UNC threads is 18, which can be converted to 1.41mm per pitch. Therefore, there is no chance to fit a M8 bolt to a 5/16 nut.
Garden Size and Watering Needs
When you're looking at 5/8 or 3/4 garden hose options, you need to consider your garden's size and watering needs to get the perfect one. If you have a large garden, you need longer hoses with higher water flow capacities. So, you'll need the ¾-inch diameter hose.
GHT, commonly found on garden hoses, has a standard size of 3/4-inch diameter. It's designed for residential use and doesn't require tools to connect, as the fittings are typically designed to be hand-tightened. NPT, on the other hand, is primarily used in plumbing and industrial settings.
Garden hose thread size is referred to in National Hose (NH) and Garden Hose Thread (GHT). The connector sizes are generally 3/4" or 5/8" (based on the internal diameter of the hose) which may vary, the most popular size is 3/4" (11.5 NH).
Garden hoses are available in ½', 5/8', and ¾' sizes. 5/8 inches is the most commonly recommended size for homeowners for everyday lawn and garden watering. The smaller the hose's diameter, the greater the water pressure will be that is emitted.
What is Dash Sizing? Simply put, a dash size refers to the inside diameter of a hose, tube, or fitting in 1/16” increments. For example, if the size of a hydraulic fitting is -8AN, sometimes written as -08, the fitting is 8/16ths of an inch. Simplified down, the size of the hole is 1/2”.
M6 is really close to 1/4". M8 is really close to 5/16". M6 and M8 are close in size, but are not interchangeable with 1/4" and 5/16". The thread pitch is different, so it won't thread into the same hole even if the diameter is roughly the same.
abbreviation for mate: used, for example in text messages and on social media, to refer to a friend. (Definition of m8 from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
A: A 5/16 Hanger Bolt and M8 (or 8mm) hanger bolt are very similar in size, but have different threading on them.
A 3/8 inch hose has a larger internal diameter than a 5/16 inch hose, allowing it to carry more fluid or air at the same pressure. This makes the 3/8 inch hose more suitable for applications requiring higher flow rates.
The hose size will dictate the size of the fittings you'll need. You'll need small fittings if you're working with a small hose. Conversely, working with a large hose, you'll need large fittings. It's important to ensure that the fittings match the size of the hose to prevent leaks or other issues.
A 5/8-inch diameter is the standard hose for watering the garden and other home tasks. It delivers around 27 gallons of water per minute. It can be easily connected to spigots, faucets, and watering tools. A 3/4-inch hose is a bigger hose that carries more water but is heavier.
The smaller 1/4-inch hose is standard for many home machines, while the larger 3/8-inch hose is preferred by professionals.