We’ve added a series of drawings from Steel King that detail out the critical dimensions for various kinds of pallet rack, ranging from selective to drive-in, to over-door pallet storage racks. It’s a small PDF file (just 368 KB) that shows front and side views of various rack types and the things needed to correctly specify them. It’s easy to print and has some other links to useful pallet rack information and web pages.
Check it out. If you’re working on a rack project, it’s one more tool you can put to fast use.