What Size Hole For Bathroom Sink Drain

By | March 22, 2022

What Size Hole For Bathroom Sink Drain

The size of the hole for a bathroom sink drain is an important consideration when installing or replacing a sink. The correct hole size will ensure that the drain fits properly and prevents leaks. There are a few different factors to consider when determining the correct hole size, including the type of sink, the type of drain, and the thickness of the sink.

The most common type of bathroom sink is a drop-in sink. Drop-in sinks are installed by placing them in a hole cut into the countertop. The hole size for a drop-in sink will typically be between 1-1/2 inches and 2 inches in diameter. The hole size for a drop-in sink should be slightly smaller than the diameter of the sink's drain flange. This will allow the drain flange to be properly seated on the countertop and prevent leaks.

Undermount sinks are another popular type of bathroom sink. Undermount sinks are installed by mounting them underneath the countertop. The hole size for an undermount sink will typically be between 1-1/4 inches and 1-1/2 inches in diameter. The hole size for an undermount sink should be slightly larger than the diameter of the sink's drain flange. This will allow the drain flange to be properly seated on the sink and prevent leaks.

The type of drain is also a factor to consider when determining the correct hole size. There are two main types of drains: pop-up drains and lift-and-turn drains. Pop-up drains are opened and closed by pressing on a button or lever. Lift-and-turn drains are opened and closed by turning a knob or handle. The hole size for a pop-up drain will typically be between 1-1/2 inches and 2 inches in diameter. The hole size for a lift-and-turn drain will typically be between 1-1/4 inches and 1-1/2 inches in diameter.

The thickness of the sink is also a factor to consider when determining the correct hole size. The thicker the sink, the larger the hole size will need to be. This is because the drain flange will need to be able to reach through the sink and be properly seated on the countertop or sink.

By following these guidelines, you can ensure that you choose the correct hole size for your bathroom sink drain. This will help prevent leaks and ensure that your sink drains properly.


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