McMaster Carr

[bradp]

I gotta say I’ve had nothing but good purchasing experiences from them. They have pretty much every weird little fastener, some milspec stuff and I usually get items the next day via ground (used to in PA and the same here in NC).  Also their app / website is one of the most easy to navigate and organized to find exactly what you need in a couple of click. I just ordered some threaded rod and fasteners to do some suspended shelves from my garage and once again am a happy customer.

 

  

[MB65E]

100% Their App on the phone is awesome!! 
great shipping too.

-Matt

[Hank]

McMaster is good! Been using them at work for a long time But if you need something and can't find it there, check these folks:

www.mscdirect.com

I've been buying from them since they published a catalog (the Big Book), a 9" x 12" monster of 2000+ pages. But be warned:  you'll pay for them having everything. I always tell people, If MSC doesn't have it, you don't need it.

[gsxrpilot]

+1 for McMaster

My 4Runner is built for severe off-road action and towing an equally capable camper trailer. I did most of it my self with the help of countless parts from McMaster.

[carusoam]

If you work in an engineering lab...

The Mcmaster catalog was on every tech’s bench... fully bookmarked.... or bent pages...

-a-

[N201MKTurbo]

The problem is they won’t tell you who made the stuff they sell. Sometimes it is what you want and sometimes not. 
 

They have started giving certs for their parts. For a long time you couldn’t use their parts on government projects.