Standard Sink Drain Size

So even though there are different sizes of drains for your bathroom sink according to the international code council the standard is 1 inch.

Standard sink drain size.

According to signature hardware a standard kitchen drain is 3 1 2 inches in diameter. The drain strainer the bowl shaped piece inside the drain mouth matches this dimension. The standard size and setting every state may have different code on plumbing and it may affect the required size of the bathroom sink pipe. This is the measurement across the center of the drain from one side to another.

While a bathroom sink s design and overall size may vary from one model to the next the drain holes are fairly standard 1 25 inches being a general standard with widths of 1 5 inches and 1 625.