As the article states, supplying CAD models is a huge benefit. I have specified McMaster parts just because they were available and provided a model all while being slightly more expensive. A rarity in my field.

As a mechanical engineer I’ve used this site an insane amount

Pretty much anyone who has dabbled with mechanical engineering in North America should know about it. Though only those with industrial scale budgets or simplyvthe need for a specific part immediately would order from there.

That’s lovely.
And I just realised what I needed was an Internal and External Tooth Lock washer. I didn’t know before, what it was called.

A pity that the US pricing is to high for my country, on top of which, it might be shipped from the US, adding expense.