And SmallParts I think is now Amazon Supply or something, but dear god would I not trust Amazon for that sort of purchase. Especially PPE like allegedly 3M respirators. Who knows how much of this is counterfeit.
Sadly they were acquired by Amazon and effectively ruined. In theory Amazon sells the same parts but Amazon's search for specialized parts is dreadful, and when you find a part it's often out of stock or available with a long lead time from a dubious supplier.
To me Small Parts is the classic example of how Amazon is systematically stamping out smaller but better suppliers. I'm not sure why Amazon even needed to acquire them. They could have sold those types of parts anyway. I wonder if they simply wanted the smallparts.com url, which now leads to Amazon.
I should clarify why I liked Small Parts vs McMaster Carr: I'm in Canada and Small Parts would ship to Canada, but McMaster Carr would not ship here unless you had a business, but my work was for a hobby.
Later I discovered that they provide CAD drawings for everything they carry. That was immensely helpful when designing things in say, Solidworks. If there were some screws that were called for it only took a visit to McMaster-Carr to get a 3D version of the real part.
Amazon Supply is pretty useless, and Small parts was never really great either.