Is this a topmount sink? Yes, I believe if your bowl dimensions are 14"x14" in an 18" wide cabinet, you should be fine. Cabinetry sides are usually 5/8" to 3/4" thick. Even if they were 1" thick, you'd still have 16" of space. I'm not an expert, but I'm installing a sink into a similar tight fit, and all the forum threads I've read about this plus a cabinet company I talked to said it would be possible.

thank you! Yes it is a topmount. The inside dimensions of the cabinet are 16 1/2". It will be a tight fit. The rails where the clips attach are a little wider than the bowl. 15" from rail clip to rail clip. That's pretty tight. But if we mount the clips in front and back it might work.

It will be fine. Don't be afraid to scoop the cabinet sides to get access to the clips either.

thank you everyone