I'm looking for some flanged bolts, doesn't matter if it's hex, Allen, or 12 point. The problem is all the flanged diameters for the 1/4-28 bolts I've seen are too large. They are either .515" or .573ish" diameter. I need something that will be <.495" which is what the existing ones I'm replacing are. Any ideas where to look? So far I've tried McMaster, Fastenal, Bolt Depot, Aircraft Spruce, and some others.
Thanks for the advice!