Question: are all faucet holes standard?
Answer: Many two-handle and single-handle kitchen faucets are widespread faucets. On many three- and four-hole kitchen sinks, 6 or 8 inches is a standard sink faucet hole size. ... A standard sink faucet hole has a diameter of 1 3/8 inches, but because not all faucets are the same, some will require a 1 1/2-inch hole.