Have you worked with a custom screw manufacturer that you liked?

As part of DFMA for a product I'm working on, I'd like to be picky about fasteners to a degree that makes it hard to source all the screws that I need off-the-shelf. e.g. magnetic, metric, torx drive.

I'm not seeing all of the fasteners I'd like on McMaster or Fastenal, so I'm thinking of placing a custom order with a fastener supplier in China.

My only hesitation is that the last time I did this, I picked a random supplier on Alibaba and the screws I got were rather low quality. I was wondering if anyone here has worked with a supplier that they liked? I'd be grateful for the recommendation!