Update bom.md

[sedorr]

Added proper spec names for fasteners and replaced 2 rotted links (bearings) with generic search links. You might want to replace the search links with actual product links, but I don't have much experience with what to look for on aliexpress pages and all the sources I normally use aren't global or much more expensive than aliexpress.

[andreisperid]

Thank you @sedorr !

The idea for having the AliExpress links are to give an idea of how each component look like. People may or not buy there, it is just a suggestion. Anyways, good idea adding a generic link for a search, it is really hard to keep up with the rotting ;)

The only issue is with the washers, they are not meant to be oversized. I have checked here, and the measures for them are as follows:

M3

• external ~7mm
• internal ~3.2mm
• thickness ~0.5mm

M6

• external ~12mm
• internal ~6.3mm
• thickness ~1.6mm

From what I looked here, that would mean a "DIN EN ISO 7090" standard for both, right?

[sedorr]

@andreisperid Yes, but the aliexpress link leads to oversized washers, so I thought they were supposed to be oversized.
DIN EN ISO 7090 refers to chamfered washers and DIN EN ISO 7091 refers washers without the chamfer.