I’d like to stock a bit of small metric hardware in my shop for use on 3d printers and related projects. I went to bolts depot and found that there are clearly more sizes and types of M2 -M6 hardware that I have any reason to stock.
I’d like to narrow things down a bit. I like button head bolts because they seat flat against flat parts. I also see a lot of hex socket head screws/bolts - often with ridges around the cap. I don’t understand the benefit of these over button-heads.
Beyond the types of bolts, I’m like to identify good sizes to have. M2 is pretty small, but may be handly. M3 - M5 seem the most useful. What lengths are most often used? I don’t expect I’m use many long thin bolts just as I doubt I’ll need lots of short fatties.
Anyway, I know I can buy random assortments on amazon, but I’d rather buy someplace like bolts depot and pick up a 100 pieces each of maybe a couple dozen popular sizes so I can build projects without knowing that I’ll need to make a 1.5hr trip to a hardware store.
I stock wood screws and that’s worked well. I keep a stock of sizes from 5/8 to 3 1/2”. The biggest portion are 2 1/2 and 1 1/2 since most of my wood projects are built with 2x4, 2x6, and 3/4” plywood.
I’d like to do something similar for 3d printers and similar projects.