What Size Are Kitchen Faucet Connections?

Kitchen faucet connections come in different sizes and often in different threads. Before buying a kitchen faucet, you need to ensure that your connections match. Suppose they don’t, then you’ll need an adapter or new connections altogether. 

Are you wondering, What size are kitchen faucet connections? Luckily, we’ve created this guide that shows you the main kitchen faucet connection sizes to make your shopping easy.

What Size Are Kitchen Faucet Connections?

What Size Are Kitchen Faucet Connections

There are countless ways to get a drink of water, from different faucet types – the water supply line.

Water is provided to a faucet by two 1/2 inches of water pipes; one transports hot water while the other carries cold. The cold line connects to a shutoff valve that acts as an on/off switch for all water access in your bathroom.

To ensure you’re choosing the right angle stop, it’s essential to take measurements of your specific pipes before ordering. The bulk of valves has 3/8-inch compression threaded discharge ports. Two 1/2 inch male thread ports are standard with valves in plumbing systems.

What Size Is My Faucet Connection?

Faucet connectors don’t have to meet any standard, but the most popular sizes are generally 1/2-inch male pipe thread.

The cables that connect the valves to the taps are important as they are among the most common places for ruptures and leaks. They typically have one 1/2-inch diameter, come in various lengths, and are compatible with 3/8- & 1/2-inch female connectors. 

Hence, you can always find the best option for your faucet and valves.

What Size Is A Faucet Thread?

Faucet aerators control water pressure in a sink, bathtub, or shower. There are two types of faucet aerators: Junior and Regular. Each style comes in various sizes based on the diameter of the hole’s disc inside the faucet’s spout. 

The most common size is 55/64″ female threaded and 15/16″ male threaded, whereas popular sizes for Junior are 13/16″ male threaded and 3/4″ female threaded. 

Another type, called “Tom Thumb”, is available for those concerned about plastic leaching into their drinking water. These fit all modern-day standard kitchen taps and showers. However, they tend to be incompatible with a vintage plumbing fixture.

What Is The Standard Faucet Supply Line?

If you’re unsure of which size to purchase, use a measuring tape to ensure that the faucet and sink are compatible with each other. Once you’ve measured it out, drill the hole according to those measurements.

While some faucet holes may vary in size, depending on the faucet or sink you’re trying to match, the ideal hole diameter is 1 3/8″. Many kitchen users opt for this diameter because it is a common standard size.

Still, before making a decision, it is essential to know that there are also variances within these two measurements. For example, some companies sell models requiring a larger hole that measures 1 ½”.

The first thing you should note is that the size of your faucet determines the hole size. Assume you’re captivated by a gorgeous faucet that’s broader than your kitchen faucet hole.

It would be best to keep in mind that your faucet’s size determines what size hole it will fit. Consider buying a new faucet if yours doesn’t fit comfortably into the hole cut out of your countertop or sink location because it has some seriously stylish facets and alluring curves.

Are Kitchen Faucets Universal Size?

The answer is no. It is widely accepted that the most common kitchen sink faucet hole size measures 1.375 Inches ( 34.925 mm), but the size is different depending on the manufacturer. 

Please confirm your location measurements and remember that custom sizes are also available upon request.

There are a lot of kitchen faucets out there; no one knows what size hole they should have. A kitchen sink installation may seem straightforward, but you need to remember that the wrong faucet can make the project a hassle.

Does Size Matter With Standard Faucet Supply Lines?

In this scenario, size is a vital consideration. The size of your sink’s faucet should ideally be ½ inch. When making quick calculations, we can say the correct size for a faucet in your sink. 

Most people have this, and it works well with standard water pressure. That, in turn, addresses the first half of the first question stated above.

Another key consideration when choosing a faucet is how big or small the sink is. Depending on what are the requirements of your project, two types can have different female connecting fittings:

  • A ½-inch slip connection with an adapter that fits into the male connector is then joined by a rubber washer that helps tighten the connection.
  • Custom slip joints are available in ½ inch exterior diameter, and they are the same as a regular slip joint, only minus the insert.


So, what size are kitchen faucet connections? The standard faucet supply line is 1/2-inch. But that doesn’t tell you what size is your faucet connection. 

Hence, if you are planning on updating your kitchen, do some research to make the best choice possible.

For those of you that might be a bit confused, we’d like to clear up some confusion around faucet connections and size. If you have any questions or comments, please leave them below!

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Edvian Berrios is a homeowner who has become a plumbing expert through self-study and practical experience. Despite not being a professional plumber, Berrios's deep understanding of fixtures and do-it-yourself techniques has enabled him to successfully handle even the most challenging plumbing problems in his own homes.