Most of the time, the hole for your kitchen faucet will be 1 3/8 inches across. That's the standard size you'll typically see. But here's the catch - not all faucets play by the same rules. Some of them require a little more breathing room with a 1 1/2-inch hole instead.
Use the Specification Sheet, or measure the product for the hole configuration. The product Technical Specification sheet will have the recommended hole size and spacing required for installation. The specification sheet is on the website under the product's image, in the Documents and Specs tab.
Due to so many different styles, kitchen faucets are not universal. The base plate is often the differentiating factor with some the mounting holes are the standard 1 3/8” but there are also faucets on the market that have a 1 or 1 1/2” mounting hole.
The standard size for the hole is 35mm. This will be the same for any modern sink, whether it is a classic Belfast style or a stainless steel overmount style. It follows then, that most modern mixers will be a standard size themselves and that size is 22mm.
Most faucets fit holes that are 1-3/8″ or 1-1/2″ in diameter.
Sinks and faucets come in different configurations. The faucet configuration has to line up with the number of holes in the sink. The two components don't necessarily have to match exactly, as extra holes can be hidden with plugs and baseplates.
Whether you have a single or double basin sink, the standard, universal drain hole diameter is 3-½”, this size ensures compatibility with other drain assemblies or garbage disposals.
4-hole sinks allow for a two-handle faucet and a sprayer or soap dispenser. 3-hole sinks allow for two-handle faucets only without accessories. 2-hole sinks allow for a single-hole faucet, and an accessory, like a sprayer. 1-hole sink has no deck plate, and is designed for a single-handle faucet.
Sinks generally come in one of three configurations: 6”, 8”, and 6”-16”. The faucet will cover the holes in most of these configurations. You will need to measure the width between the outer holes or estimate it by measuring the width of the deck plate.
Measure the Sink Opening
Common Sizes: Most sink drain openings are 1 1/4 inches in diameter, but you might also find sizes like 1 1/2 inches and 1 5/8 inches.
One-hole kitchen faucets with a single handle are user friendly and easy to clean around. Two-hole kitchen faucets may be a bridge-style design or a handle/faucet combination with room for a sprayer. Three-hole kitchen faucets are traditional faucets with hot and cold taps and a fourth hole for the sprayer.
NOTE: THIS FAUCET IS DESIGNED TO BE INSTALLED THRU 2 HOLES: A 1-1/2" (38MM) MIN. DIA. HOLE FOR VALVE AND A 1-1/4" (32MM) MIN.
Bathroom taps come in many sizes in terms of the height of the neck and the length of the spout. But most fit into a standard size tap hole (28mm for a bath tap and 22mm for a basin tap). They can sometimes vary, though, so always check before drilling holes.
For center set faucets, the spacing of the tapped holes is 4 inches, whereas for wide-range faucets, the distance between the hot inlet and cold inlet or mounting hardware is 8 inches. All faucet holes are 13/8 inch standard size, but some faucets are 11/2 inch.
As a rule of thumb, for Metric threads, the tapping drill can be calculated by subtracting the pitch from the diameter of the thread. eg for an M5x0. 75 thread the tapping drill is 5-0.75mm = 4.25mm. For Imperial (inch) threads the tapping drill size is calculated in the same way, diameter minus pitch.
Faucet Connector Sizes
The inlets on a faucet are the components that connect to your water supply lines. Most faucets in the United States have a 1/2" MPT (male) or 1/2" FPT (female) threaded inlet. These connections use the NPT (National Pipe Thread) standard.
The standard size hole for a kitchen faucet is typically 1 3/8 inches (35 mm) in diameter, as per industry norms . This size is commonly used for the mounting hole in most kitchen sinks. It's important to note that this is a general standard, but variations may exist.
Before installing a new kitchen faucet, be sure to go underneath your kitchen sink and check how many holes your existing sink uses. While a one-hole faucet can work in a 2-hole sink, the same won't be true for a 2 or 3-hole faucet in a one-hole sink.
Most of the time, the hole for your kitchen faucet will be 1 3/8 inches across. That's the standard size you'll typically see. But here's the catch - not all faucets play by the same rules. Some of them require a little more breathing room with a 1 1/2-inch hole instead.
Are all kitchen taps the same size? Kitchen taps come in many sizes in terms of the height of the neck and the spout. But their base sizes range from 44-60mm, all of which fit into a kitchen sink's standard size pre-drilled tap hole of 35mm.
No, there is a variety of kitchen faucet styles and fittings, and the right style will depend on your home's design.
Faucet spread is the distance between the operating handles or mounting holes in a sink top. This measurement is taken from the center of one handle's mounting hole to the center of the opening on the opposite side.
Remember, for any product that goes in a drain, you will first need to remove the drain cover/grate before measuring. Then measure the diameter at the top of the drain hole. When in doubt, round up to the nearest size.
Kitchen sinks drains do share a universal diameter of 3-1/2", regardless of the sink type. The proper kitchen drain, however, will depend on the material of your sink and whether it has a garbage disposal or not.
What size drain do I need for my sink? Why does the lesser value still fit? There are three common drain sizes for bathroom sinks, 1.25", 1.5" and 1 5/8 (1.625"). You need to select a drain that is the same size or SMALLER than the hole in your sink.