Sink Drain Dimensions


Sink drains in every household is designed simply for carrying water that comes from your sink basin into your home’s main drainage lines. You will notice that the drains normally come in various sizes. The size of the drain depends on the type of the sink along with how much volume of water needed by the drain that it needs to carry. Always bear in mind that the size of drain for your kitchen and bathroom might not be the same because each of the drains handles different size of faucets and also the rates of the water flow.

To sink drain dimensions, you need:

  • Kitchen sink drains measuring at 3 1/2 inches in diameter
  • Bathroom sink drain measuring at 1 1/4 inches wide
  • Shower drain measuring at 3 1/4 inches in diameter
  • A tub drain measuring at 1 1/2 inches in diameter
  • Bar sink drains measuring at 3 1/4-inch in diameter

Sink Drains

Sink Drain Dimensions

  • The standard dimension for a kitchen sink drain is approximately 3 1/2 inches in diameter that is the total overall size of the drain opening found at the bottom of your sink.
    • The above measurement is not similar as the drainpipe.
    • The sink drain consists of a basket strainer, a round object that comes with grate to filter out food and debris from entering your drainpipe.
    • Basically, it works like a funnel toward the drainpipe and P-trap having a diameter of 1 1/2 inches.
  • As for bathroom sink drain, it is much smaller that the kitchen drains because it is seldom used with its measurement is 1 1/4 inches wide
    • As for the drain opening in the sink basin, it usually comes with 1.375 inches wide. The width is a little bit large so that the drain plug would be able to fit inside the drain hole.
    • The bathroom sinks usually use 1 1/4-inch drainpipe that will be connected to a 1 1/4- or 1 1/2-inch P-trap.
  • The shower drain is designed with 3 1/4 inches in diameter along with a screened strainer that fits over the opening.
    • While the tub drain that has 1 1/2 inches in diameter is connected to a 1 1/2-inch P-trap and drainpipe.
  • Another sink’s dimensions include the bar sink with a standard 3 1/4-inch drain size and use 1 1/2-inch drainpipes and P-traps.
    • There is also a laundry sink drain with 1 1/2 inches in diameter that also uses a 1 1/2-inch drainpipe and P-trap.
    • As for whirlpool tub, it uses a 1 1/2-inch drain along with the same size drainpipe and P-trap.

As for other type of drains, the dimensions is similar as per mentioned above while the drain sizes are selected based on the volume of the drainage.

Always remember that the sink drain color finish is normally matched with the sink.

  • You can also use any drain to cater for any type of sink.

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