These guys have virtually EVERYTHING I've wanted in the way of hardware, both personally and for my job as a mechanical engineer at a Navy base manufacturing rocket propellant. Their catalog looks like an old-time urban phone book; it's about 3" of thin paper pages, with the best lookup system I've ever seen, but they can be tight about giving out the hard copies. And they have had 2-day delivery on most items since long before Amazon ever existed. They are not a discount operation however; their pricing is mainly manufacturer suggested retail.
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McMaster-Carr supplies products used to maintain manufacturing plants and large commercial facilities worldwide.