McMaster-Carr is fantastic! I've been using McMaster-Carr for years. They always have the bolts and other hardware that no one else has. They also have very good pdfs with dimensions as well as CAD renderings. These are very important when your building prototypes and trying to figure out what may or may not work on a one off project. The best part is you get them either the next day or the following. Highly recommend!

Poorly managed, non customer centric business. Customer service is arrogant and unprofessional. Shipping policies are absolutely mental, I don't think they want business? Products are equally poor. Received a rusted and bent bar that looks as though I could have bought off of Ali-x for a 5th of the cost. All kinds of stupid rules regarding shipping. They are not customer centric. No reason to do business with them at all, deleted my account. So many other companies deserve my patronage more than this one. Hope this saves someone some trouble.

Nonsense shipping policies At first they let me know I was able to receive the order in Mexico, however I decided to receive it at El Paso, because of the shipping price, without explaining them further info They let me know they can't ship my order to any address inside the U.S. since I'm probably going to take the order outside the country and they take a "conservative approach to shippments outside North America" Literally only ordering 4 locating pins... Reading the rest of the reviews I found out they really don't like foreign people, I thought it was only for the Mexico thing, but nah

World class company I’m giving them five stars despite their bizarre website tactic of blocking people searching for parts. They have an incredible catalog and more importantly, they’re shipping is world class. My orders typically arrive in just 1 to 2 business days which is greatly appreciated.

Shipping Cost Surprise - Huge! I recently placed a small order - just over $20 - with McMaster-Carr. During the order process I was not able to see, or even estimate, the shipping cost. All I got on the order page was "shipping and tax will be added." OK, I figured, I'll take a chance. 24 hours later, my shipment was in the mail and I finally got a receipt showing the shipping (and tax) amount. Turns out the shipping was more than 40% of the total order, making it substantially less competitive with other suppliers. My advice: (1) shop around. (2) If you MUST buy from McMaster-Carr, don't press "buy" until you know the shipping cost.