[chrisdalke]

The cult of McMaster is real -- My university's mechanical engineering department mailroom was always filled with McMaster packages. Insanely fast (Sometimes same day) turnaround, and you knew when you bought something they had selected the best possible supplier.

And my favorite feature: Nearly every part comes with complete data sheet and CAD models on the product page.

One anecdote: I ordered a large mounted bearing for an electric vehicle drivetrain, about a $250 part. Upon opening it, I was confused because the bearing didn't seem like it was seated correctly -- It was slightly off-axis. I called McMaster and they sent a free replacement the same day, no questions asked. I later realized the bearing was self-aligning and needed to be greased/mounted to align properly, so it was 100% my mistake and the first part was completely fine!

[chorsestudios]

McMaster including CAD models of parts is extremely helpful. Printing parts to test before I purchase has saved me money in the past. Fusion 360 integration with McMasters catalog has been convenient and is very user friendly.