Comment by jdc0589

It might not work, and it doesn't have to. McMaster isn't designed to be a highly competitive retail marketplace for the average consumer or the average consumer product.

It's for people building things that already have a good idea of what they need. For the most part, if you need an 18mm long 1/4-20 flange head hex-socket grade-8 bolt in a black oxide finish, you don't care about having a ton of options from different manufacturers, because there should not be a meaningful difference between any of them.